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| 1 | An Overview of Mineral Dust Modeling over East Asia显示文摘East Asian dust(EAD) exerts considerable impacts on the energy balance and climate/climate change of the earth system through its influence on solar and terrestrial radiation, cloud properties, and precipitation efficiency. Providing an accurate description of the life cycle and climate effects of EAD is therefore critical to better understanding of climate change and socioeconomic development in East Asia and even worldwide. Dust modeling has undergone substantial development since the late 1990 s, associated with improved understanding of the role of EAD in the earth system. Here, we review the achievements and progress made in recent decades in terms of dust modeling research,including dust emissions, long-range transport, radiative forcing(RF), and climate effects of dust particles over East Asia. Numerous efforts in dust/EAD modeling have been directed towards furnishing more sophisticated physical and chemical processes into the models on higher spatial resolutions. Meanwhile, more systematic observations and more advanced retrieval methods for instruments that address EAD related science issues have made it possible to evaluate model results and quantify the role of EAD in the earth system, and to further reduce the uncertainties in EAD simulations. Though much progress has been made, large discrepancies and knowledge gaps still exist among EAD simulations. The deficiencies and limitations that pertain to the performance of the EAD simulations referred to in the present study are also discussed. | Siyu CHEN Jianping HUANG Yun QIAN Chun ZHAO Litai KANG Ben YANG Yong WANG Yuzhi LIU Tiangang YUAN Tianhe WANG Xiaojun MA Guolong ZHANG | 2017 | Journal of Meteorological Research2017，31，4： | 7 |
| 2 | Machining deformation of single-sided component based on finishing allowance optimization显示文摘Owing to reliability and high strength-to-weight ratio,large thin-walled components are widely used in the aviation and aerospace industry.Due to the complex features and sequence involved in the machining process of large thin-walled components,machining deformation of component is easy to exceed the specification.In order to address the problem,it is important to retain the appropriate finishing allowance.To find the overall machining deformation,finishing allowance-induced deformation(web finishing allowance,sidewall finishing allowance)and initial residual stress-induced deformation were considered as major factors.Meanwhile,machined surface residual stress-induced deformation,clamping stress-induced deformation,thermal deformation,gravity-induced deformation and inertial force-induced deformation were neglected in the optimization model.Six-peak Gaussian function was introduced to fit the initial residual stress.Based upon the obtained function of initial residual stress,a deformation prediction model between initial residual stress and finishing allowance was established to attain the finishing allowanceinduced deformation.In addition,linear programming optimization model based on the simplex algorithm was developed to optimize the overall machining deformation.Results have concluded that the overall machining deformation reached the minimum value when sidewall finishing allowance and web finishing allowance varied between 1 and 2 mm.Additionally,web finishing allowance-induced deformation and sidewall finishing allowance-induced deformation were1.05 mm and 0.7 mm.Furthermore,the machining deformation decreased to 0.3–0.38 mm with the application of optimized finishing allowance allocation strategy,which made 39–56%reduction of the overall machining deformation compared to that in conventional method. | Xiaoyue LI Liang LI Yinfei YANG Guolong ZHAO Ning HE Xiaocen DING Yaowen SHI Longxin FAN Hui LAN Muhammad JAMIL | 2020 | Chinese Journal of Aeronautics2020，33，9： | 6 |
| 3 | Preparation of Tungsten Film and Its Tribological Properties under Boundary Lubrication Conditions显示文摘Tungsten film(W film) is deposited by using the ion beam assisted deposition(IBAD) on the 316 L substrate surface in this experiment. The micro structure and nano-hardness of the film are investigated by scanning electron microscopy(SEM) and nano-indentation tester. The tribological behavior of W film under lubrication by oil with ZDDP and MoDTC is evaluated by a SRV test machine. The tribo-film formed on the worn surfaces is investigated by X-ray photoelectron spectroscopy(XPS) to find out the tribological mechanisms between the W film and the two additional additives. The result shows that the W film lubricated by ZDDP and MoDTC-blended base oil has synergistic effects on the friction reduction property, while the anti-wear property is mainly caused by the hard surface of W film. | Li Xingliang Yue Wen Wang Song Li Guolong Zhao Shiqian | 2014 | China Petroleum Processing & Petrochemical Technology2014，16，3： | 6 |
| 4 | Bevacizumab biosimilar LY01008 compared with bevacizumab(Avastin)as first-line treatment for Chinese patients with unresectable,metastatic,or recurrent non-squamous non-small-cell lung cancer:A multicenter,randomized,double-blinded,phase Ⅲ trial显示文摘Background:Previous studies have demonstrated the preclinical pharmacological and toxicological consistency,and clinical pharmacokinetic equivalence of bevacizumab biosimilar LY01008 with reference bevacizumab(Avastin).This randomized controlled trial aimed to compare the efficacy and safety of LY01008 with Avastin in first-line treatment of Chinese patients with advanced or recurrent non-squamous non-small cell lung cancer(NSCLC).Methods:StageⅢB-ⅣNSCLC patients with evaluable lesions,good physical status,and adequate organ functions from 67 centers across China were randomized in a ratio of 1:1 to receive LY01008 or Avastin 15 mg/kg intravenously in combination with paclitaxel/carboplatin(combined treatment)for 4-6 cycles,followed by maintenance monotherapy with LY01008 until disease progression,intolerable toxicity,or death.The primary endpoint was objective response rate(ORR)in accordance with Response Evaluation Criteria in Solid Tumors(RECIST)version 1.1 confirmed by independent radiological review committees(IRRC).Secondary endpoints included disease control rate(DCR),duration of response(DoR),progression-free survival(PFS),overall survival(OS),and safety.This study was registered in Clinical Trials.gov(NCT03533127).Results:Between December 15^(th),2017,and May 15^(th),2019,a total of 649 patients were randomized to the LY01008(n=324)or Avastin(n=325)group.As of September 25th,2019 for primary endpoint analysis,589 patients received ORR evaluation,with a median number of combined treatment cycles of 5(range 1-6)andmedian duration of treatment of 3.0(range 0.0-5.1)months.ORRof responseevaluable patients in the LY01008 and Avastin groups were 48.5% and 53.0%,respectively.The stratified ORR ratio was 0.91(90%CI 0.80-1.04,within the prespecified equivalence margin of 0.75-1.33).Up to May 15^(th),2020,with a median follow-up of 13.6(range 0.8-28.4)months,no notable differences in DCR,median DoR,median PFS,median OS,and 1-year OS rate were observed between the LY01008 and Avastin groups.There were no clinically meaningful differences in safety and immunogenicity across treatment groups.Conclusions:LY01008 demonstrated similarity to Avastin in terms of efficacy and safety in Chinese patients with advanced or recurrent non-squamous NSCLC.LY01008 combined with paclitaxel/carboplatin is expected to become a new treatment option for unresectable,metastatic,LY01008 and Avastin groups.There were no clinically meaningful differences in safety and immunogenicity across treatment groups.Conclusions:LY01008 demonstrated similarity to Avastin in terms of efficacy and safety in Chinese patients with advanced or recurrent non-squamous NSCLC.LY01008 combined with paclitaxel/carboplatin is expected to become a new treatment option for unresectable,metastatic,or recurrent non-squamous NSCLC patients in the first-line setting. | Yuankai Shi Kaijian Lei Yuming Jia Bingqiang Ni Zhiyong He Minghong Bi Xicheng Wang Jianhua Shi Ming Zhou Qian Sun Guolei Wang Dongji Chen Yongqian Shu Lianke Liu Zhongliang Guo Yong Liu Junquan Yang Ke Wang Ke Xiao LinWu Tienan Yi Debin Sun Mafei Kang Tianjiang Ma Yimin Mao Jinsheng Shi Tiegang Tang Yan Wang Puyuan Xing Dongqing Lv Wangjun Liao Zhiguo Luo Bin Wang Xiaohong Wu Xiaoli Zhu Shuhua Han Qisen Guo Rongyu Liu Zhiwei Lu Jianyong Zhang Jian Fang Changlu Hu Yinghua Ji Guolong Liu Hong Lu Dedong Wu Junhong Zhang Shuyang Zhu Zheng Liu Wensheng Qiu Feng Ye Yan Yu Yanqiu Zhao Qinhong Zheng Jun Chen Zhanyu Pan Yiping Zhang Wenjuan Lian Bo Jiang Bo Qiu Guojun Zhang Hua Zhang Yanju Chen Yuan Chen Hongbing Duan Manxiang Li Shengming Liu Lijun Ma Hongming Pan Xia Yuan Xueli Yuan Yulong Zheng Emei Gao Li Zhao Shumin Wang Can Wu | 2021 | Cancer Communications2021，41，9： | 5 |
| 5 | Laser-induced oxidation assisted micro milling of high aspect ratio microgroove on WC-Co cemented carbide显示文摘Severe tool wear and poor surface quality are the main problems during micro machining of cemented carbide.In this work,an innovative hybrid process of laser-induced oxidation assisted micro milling(LOMM)was proposed to solve the problems.A nanosecond laser was utilized to induce oxidation of the WC-20%Co material,producing loose oxide which was easy to remove.The micro machinability of the material was improved by laser-induced oxidation.The oxidation mechanisms of cemented carbide were studied.A microgroove with a depth of 2.5 mm and aspect ratio of 5 was fabricated successfully.The milling force,surface quality and tool wear mechanisms were investigated.For comparison,a microgroove was also fabricated with conventional micro milling(COMM)using identical milling parameters.Results revealed that in LOMM the milling force and tool wear rate were extremely low during removing the oxide.The machined surface quality and dimensional accuracy achieved by LOMM were superior to those obtained by COMM.The surface roughness Saof the microgroove bottom reached 88 nm in LOMM,while the cross-sectional geometry of the microgroove was a trapezoid.Perpendicularity of the microgroove sidewall machined by LOMM was better than that by COMM.The tool wear forms in LOMM were coating spalling and slight tool nose breakage.Compared with COMM,the tool life in LOMM was prolonged significantly.It indicates that the proposed hybrid process is an effective and efficient way to fabricate high aspect ratio micro-features with high dimensional accuracy. | Guolong ZHAO Hongjun XIA Yang ZHANG Liang LI Ning HE Hans Nφrgaard HANSEN | 2021 | Chinese Journal of Aeronautics2021，34，4： | 3 |
| 6 | A New Method for Fitting Current–Voltage Curves of Planar Heterojunction Perovskite Solar Cells显示文摘Herein we propose a new equivalent circuit including double heterojunctions in series to simulate the current–voltage characteristic of P–I–N planar structure perovskite solar cells. This new method can theoretically solve the dilemma of the parameter diode ideal factor being larger than2 from an ideal single heterojunction equivalent circuit,which usually is in the range from 1 to 2. The diode ideal factor reflects PN junction quality, which influences the recombination at electron transport layer/perovskite and perovskite/hole transport layer interface. Based on the double PN junction equivalent circuit, we can also simulate the dark current–voltage curve for analyzing recombination current(Shockley–Read–Hall recombination) and diffusion current(including direct recombination), and thus carrier recombination and transportation characteristics. This new model offers an efficacious and simple method to investigate interfaces condition, film quality of perovskite absorbing layer and performance of transport layer, helping us furtherimprove the device efficiency and analyze the working mechanism. | Peizhe Liao Xiaojuan Zhao Guolong Li Yan Shen Mingkui Wang | 2018 | Nano-Micro Letters2018，10，1： | 3 |
| 7 | Characterization and Properties of Bent-Negabent Functions显示文摘A further characterization of the bentnegabent functions is presented.Based on the concept of complete mapping polynomial,we provide a necessary and sufficient condition for a class of quadratic Boolean functions to be bent-negabent.A new characterization of negabent functions can be described by using the parity of Hamming weight.We further generalize the classical convolution theorem and give the nega-Hadamard transform of the composition of a Boolean function and a vectorial Boolean function.The nega-Hadamard transform of a generalized indirect sum is calculated by this composition method. | JIANG Niu ZHAO Min YANG Zhiyao ZHUO Zepeng CHEN Guolong | 2022 | Chinese Journal of Electronics2022，31，4： | 2 |
| 8 | Energy principle and material removal sequence optimization method in machining of aircraft monolithic parts显示文摘In the machining process of aircraft monolithic parts,the initial residual stress redistribution and structural stiffness evolution often lead to unexpected distortions.On the other hand,the stress redistribution and stiffness reduction during the machining process depend on the material removal sequence.The essence of the stress redistribution is releasing the initial elastic strain energy.In the present study,the influence of the material removal sequence on the energy release is studied.Moreover,a novel optimization method is proposed for the material removal sequence.In order to evaluate the performance of the proposed method,the mechanism of the machining distortion is firstly analyzed based on the energy principle.Then a calculative model for the machining distortion of long beam parts is established accordingly.Moreover,an energy parameter related to the bending distortion and the procedure of the material removal sequence optimization is defined.Finally,the bending distortion analysis and material removal sequence optimization are performed on a long beam with a Z-shaped cross-section.Furthermore,simulation and experiments are carried out.The obtained results indicate that the optimized sequence results in a low distortion fluctuation and decreases the bending distortion. | Yinfei YANG Longxin FAN Liang LI Guolong ZHAO Ning HAN Xiaoyue LI Hui TIAN Ning HE | 2020 | Chinese Journal of Aeronautics2020，33，10： | 2 |
| 9 | Study on in-situ synthesis of ZrB 2 whiskers in ZrB 2 –ZrC matrix powder for ceramic cutting tools显示文摘 | Liang Xu Chuanzhen Huang Hanlian Liu Bin Zou Hongtao Zhu Guolong Zhao Jun Wang | 2012 | International Journal of Refractory Metals and Hard Materials2012，，： | 1 |
| 10 | Cutting force model and damage formation mechanism in milling of 70wt%Si/Al composite显示文摘High-mass fraction silicon aluminium composite(Si/Al composite) has unique properties of high specific strength, low thermal expansion coefficient, excellent wear resistance and weldability. It has attracted many applications in terms of radar communication, aerospace and automobile industry. However, rapid tool wear resulted from high cutting force and hard abrasion, and damaged machined surfaces are the main problem in machining Si/Al composite. This work aims to reveal the mechanisms of milling-induced damages of 70wt% Si/Al composites. A cutting force analytical model considering the characteristics of both the primary silicon particles and the cutting-edge radius was established. Milling experiments were conducted to verify the validity of the model. The results show that the analytical model exhibits a good consistency with the experimental results, and the error is about 10%. The cutting-edge radius has significant effects on the cutting force, surface roughness and damage formation. With the increase in the cutting-edge radius, both the cutting force and the surface roughness decrease firstly and then increase. When the cutting-edge radius is 27 μm, the surface roughness(Sa) reaches the minimum of 2.3 μm.Milling-induced surface damages mainly contain cracks, pits, scratches, matrix coating and burrs.The damage formation is dominated by the failure mode of primary silicon particles, which includes compressive breakage, intragranular fracture, particle pull-out, and interface debonding. In addition, the high ductility of aluminium matrix leads to matrix coating. This work provides guidance for tool selection and damage inhibition in high-efficiency and high-precision machining of high mass fraction Si/Al composites. | Guolong ZHAO Lianjia XIN Liang LI Yang ZHANG Ning HE Hans Nørgaard HANSEN | 2023 | Chinese Journal of Aeronautics2023，36，7： | 1 |
| 11 | Super Resolution Perception for Improving Data Completeness in Smart Grid State Estimation显示文摘The smart grid is an evolving critical infrastructure,which combines renewable energy and the most advanced information and communication technologies to provide more economic and secure power supply services.To cope with the intermittency of ever-increasing renewable energy and ensure the security of the smart grid,state estimation,which serves as a basic tool for understanding the true states of a smart grid,should be performed with high frequency.More complete system state data are needed to support high-frequency state estimation.The data completeness problem for smart grid state estimation is therefore studied in this paper.The problem of improving data completeness by recovering highfrequency data from low-frequency data is formulated as a super resolution perception(SRP)problem in this paper.A novel machine-learning-based SRP approach is thereafter proposed.The proposed method,namely the Super Resolution Perception Net for State Estimation(SRPNSE),consists of three steps:feature extraction,information completion,and data reconstruction.Case studies have demonstrated the effectiveness and value of the proposed SRPNSE approach in recovering high-frequency data from low-frequency data for the state estimation. | Gaoqi Liang Guolong Liu Junhua Zhao Yanli Liu Jinjin Gu Guangzhong Sun Zhaoyang Dong | 2020 | Engineering2020，6，7： | 1 |
| 12 | Petrogenesis of Early Cretaceous adakitic granodiorite: Implication for a crust thickening event within the Cathaysia Block, South China显示文摘Adakitic rocks in continental settings are commonly considered to be formed by partial melting of thickened or delaminated lower crust. Investigations on this kind of rocks can provide important information about crustal evolution complementary to information from other rocks. This paper reports adakitic granodiorite of the Lingxi pluton in the interior of the Cathayisa Block. LA-ICP-MS zircon U-Pb dating shows that it was formed in the late Early Cretaceous(100±1 Ma). The granodiorite has geochemical features of adakitic rocks derived from partial melting of the thickened lower crust, e.g., high SiO2(mainly ranging from 64.4 to 68.9 wt.%) and Sr(624–894 ppm) contents, Sr/Y(49.9–60.8) and La/Yb(23.4–42.8) values, low Y(10.3–17.1 ppm), Ni(5.62–11.8 ppm) and MgO(mostly from 0.86 wt.% to 1.57 wt.%) contents and weak Eu anomaly. It has initial 87Sr/86 Sr ratios of 0.7086–0.7091, εNd(t) values of.6.2 to.5.9 and zircon εHf(t) values mostly of.10.1 to.7.6. Based on the geochemical characteristics and simple modelling, it is suggested that the most likely generation mechanism of the Lingxi granodiorite is partial melting of a thickened Proterozoic lower continental crust at a pressure ≥12 kbar(or crust thickness ≥40km), leaving a garnet-bearing amphibolite residue. Combining our results and previous studies of the tectonic evolution of the Cathaysia Block, we propose that the crust was thickened to over 40 km by a compressive event occurring during the late Early Cretaceous, which is supported by the observation that there is an angular unconformity between the Upper Cretaceous Series and the early Lower Cretaceous or the Jurassic rocks. After this event, the Cathaysia Block experienced a lithospheric extension and thinning probably driven by the high-angle paleo-Pacific subduction. With the attenuation of lithosphere, the lower crust was heated to partial melting by upwelling asthenospheric materials, resulting in generation of the Lingxi granodiorite and other coeval granitoids in the Cathaysia Block. This study provides new information on the crustal evolution of the Cathaysia Block during the Early Cretaceous. | SUN LiQiang LING HongFei ZHAO KuiDong CHEN PeiRong CHEN WeiFeng SUN Tao SHEN WeiZhou HUANG GuoLong | 2017 | Science China Earth Sciences2017，60，7： | 1 |
| 13 | Plant vs. Animal Prototype for Designing Bio-inspired PEMFC Flow Fields: Corn Veins or Murray’s Law?显示文摘Designing bio-inspired flow fields holds great potential in improving the performance of Proton Exchange Membrane Fuel Cell(PEMFC).Two kinds of biological prototypes are widely used:plant prototype and animal prototype.It remains a question which one of these prototypes is more appropriate for the scenario of PEMFC.Here,a comparative study was conducted to compare bionic flow fields based on animal and plant prototypes.First,a Corn Leaf Vein Mathematical Model(CLMM)was established by extracting structural parameters from corn leaves of two growth stages.Then the obtained CLMM and well-known Murray’s law were employed to design bionic flow fields corresponding to the plant and animal prototypes,respectively,which have been subsequently compared by numerical investigations.The results demonstrate that the flow field guided by Murray’s law outperforms the counterpart based on the structural parameters of CLMM in terms of PEMFC net output power,mass transport,water management and pressure drop,suggesting that animal circulation system is more suitable to the bionic flow field design of PEMFC than plant leaf veins.The work may also offer valuable insights into the design of other flow fields related to electrochemical energy conversion. | Wenxuan Fan Taotao Zhao Ke Jiang Lei Sun Saisai Jia Qianqian Wu Guolong Lu Zhenning Liu | 2022 | Journal of Bionic Engineering2022，19，3： | 0 |
| 14 | Development of 12 MeV Electron Linear Accelerator for Nondestructive Testing显示文摘In recent years,the energy of electronic linear accelerator for nondestructive testing has a higher demand.In 2017,the Linear Accelerator Laboratory successfully won the bid of 2sets of12 MeV nondestructive testing electron linear accelerators from China First Heavy Industries.The main technical indicators are as follows:1)Equivalent steel testing thickness range,76- | YU Guolong TONG Xunhua WU Qingfeng HAN Guangwen ZENG Ziqiang BI Zhenliang HUO Jingsheng YU Guolong ZHAO Fuzhen | 2017 | Annual Report of China Institute of Atomic Energy2017，，1： | 0 |
| 15 | Completing Site Acceptance of Electronic Linear Accelerator for Cargo Inspection显示文摘In March 2017,the 6 MeV electronic linear accelerator completed the factory commissioning with the detector to provide data support for onsite installation and debugging of accelerators and detectors.The synchronization pulse provided by the external trigger device causes the | YU Guolong TONG Xunhua HAN Guangwen WU Qingfeng ZENG Ziqiang BI Zhenliang YU Guolong ZHAO Fuzhen | 2017 | Annual Report of China Institute of Atomic Energy2017，，1： | 0 |
| 16 | Development of 9 MeV Electron Linear Accelerator for ICT显示文摘According to a user Industrial Computed Tomography(ICT)upgrading needs,we developed a high stability,small focus,and explosionproof 9 MeV electron linear accelerator as a ray source of the CT system.Accelerator main technical requirements are as follows:1)X-ray energy,9 MeV;2)X-ray beam dose rate,≥3 000cGy/min(at | YU Guolong TONG Xunhua WU Qingfeng HAN Guangwen ZENG Ziqiang BI Zhenliang HUO Jingsheng ZHAO Fuzhen | 2017 | Annual Report of China Institute of Atomic Energy2017，，1： | 0 |
| 17 | Effect Evaluation of Highway Ecological Restoration Engineering显示文摘Based on the current lack of ecological functional evaluation framework for highway ecological restoration engineering,this study comprehensively considered the negative impact of the highway engineering on the area along the highway under the guidance of restoration ecology,and the improvement and promotion of artificially constructed plant community to the highway ecology environment after restoration.With the ecological restoration function of artificially constructed plant community as the research emphasis,the landscape effect of the highway ecosystem and the key position of the ecosystem service function level in the assessment of ecological restoration effect were highlighted,and a relatively complete and targeted highway ecological restoration effect evaluation system was established.On this basis,this study selected the artificially constructed plant system in a highway ecological restoration project for research,and started with the ecological restoration effect evaluation of four types of ecological restoration objects,and comprehensively evaluated its ecological restoration effect according to the constructed evaluation system.The study found that although the highway ecological restoration engineering had certain effects in improving the plant community level and the ecosystem landscape level,there were still some problems in improving the ecosystem service function level in the short term.Therefore,in the future construction of highway engineering,it is suggested to take the protection and avoidance countmeasures as far as possible in line with the principle of 'ecological benefits',in order to avoid strong disturbances to the highway ecosystem and realize the aim of 'ecological highways' in the true sense. | SONG Xia HONG Bo ZHAO Kun CHEN Guolong SUN Zhongye | 2018 | Journal of Landscape Research2018，10，5： | 0 |
| 18 | Very long survival in pediatric cancer between 1944 and 1993显示文摘ObjectiveToidentifyfactorsassociatedwithverylongsurvivalamongalcancercasesdiagnosedatage19yearsoryoungerregisteredbytheCancer... | Zhao Guolong, Cathy D Boysen, Edward F Brown, Khatab M Hassanein, Frederic k F Holmes and Grace E Foege Holmes | 1999 | Chinese Medical Journal1999，，7： | 0 |
| 19 | A FAMILY OF SUMMARY CHISQUARE TESTS FOR COMPARING SURVIVAL RATES RATHER THAN CONDITIONAL PROBABILITIES DYING显示文摘Objective This paper propses a family of summary chi square tests for comparing survival rates at all points of time between two groups. Methods They are respectively derived from the Peto et al. expression for the log rank test, the Mantel Haenszel expression for the log rank test, and the generalized Wilcoxon test by means of using the homogenetic effective sample size in place of the number at risk and using the corresponding numerator of the conditional probability surviving in place of the death number. Results After such derivations they become clearer in clinical significance, more powerful, and free from the assumption of proportional hazard. Conclusion These tests can be employed in analyzing the clinical data of cancer. A worked example illustrates the methodology. | Zhao Guolong Gao Yuanfa (Henan Medical University Zhengzhou 450052) | 2001 | 数理医药学杂志2001，14，2： | 0 |
| 20 | Oxidation mechanism of high-volume fraction SiCp/Al composite under laser irradiation and subsequent machining显示文摘Conventional mechanical machining of a composite material comprising an aluminum matrix reinforced with a high volume fraction of SiC particles(hereinafter referred to as an SiCp/Al composite)faces problems such as rapid tool wear,high specific cutting force,and poor surface integrity.Instead,a promising method for solving these problems is laser-induced oxidation-assisted milling(LOAM):under laser irradiation,the local workpiece material reacts with oxygen,thus forming loose and porous oxides that are easily removed.In the present work,the oxidation mechanism of SiCp/Al irradiated by a nanosecond pulsed laser is studied to better understand the laser-induced oxidation behavior and control the characteristics of the oxides,with laser irradiation experiments performed on a 65%SiCp/Al composite with various laser parameters and auxiliary gases(oxygen,nitrogen,and argon).With increasing laser pulse energy density,both the ablated groove depth and the width of the heat-affected zone increase.When oxygen is used as the auxiliary gas,an oxide layer composed of SiO_(2)and Al2O3 forms,and CO_(2)is produced and escapes from the material,thereby forming pores in the oxides.However,when nitrogen or argon is used as the auxiliary gas,a recast layer is produced that is relatively difficult to remove.Under laser irradiation,the sputtered material reacts with oxygen to form oxides on both sides of the ablated groove,and as the laser scanning path advances,the produced oxides accumulate to form an oxide layer.LOAM and conventional milling are compared using the same milling parameters,and LOAM is found to be better for reduced milling force and tool wear and improved machined surface quality. | Hanliang Liu Guolong Zhao Zhiwen Nian Zhipeng Huang Kai Yang Conghua Liu Peng Wang Zhenkuan Diao | 2023 | Nanotechnology and Precision Engineering2023，6，3： | 0 |
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