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| 1 | Microstructure and Mechanical Properties of Al_2O_3/ZrO_2 Directionally Solidified Eutectic Ceramic Prepared by Laser 3D Printing显示文摘Directionally solidified eutectic ceramics such as(Al)_2O_3/ZrO_2 are promising structural materials for applications in harsh environment with an ultrahigh temperature. In this work, through adopting assistant heating laser 3D printing,(Al)_2O_3/ZrO_2eutectic samples were manufactured with suppressing the formation of cracks. The dependence of the average rod spacing(λav) on the scanning rate(V) follows a relation with λav V0.5= 1 μm1.5s–0.5. Typical eutectic microstructures, so-called complex regular, were analyzed with respect to its evolution with modulating the growth conditions. Formation mechanism of the solidification defect, shrinkage porosity, was discussed and the defect is found to be significantly suppressed by optimizing the solidification parameters. The maximum hardness and fracture toughness are measured to be 16.7 GPa and 4.5 MPa m1/2, respectively. The interplay between the propagation of cracks and the (Al)_2O_3/ZrO_2 interface is discussed. | Zhi Liu Kan Song Bo Gao Tian Tian Haiou Yang Xin Lin Weidong Huang | 2016 | Journal of Materials Science & Technology2016，32，4： | 12 |
| 2 | High strength and ductility of 34CrNiMo6 steel produced by laser solid forming显示文摘Because of the excellent mechanical properties of 34 CrNiMo6 steel, it is widely used in high-value components. Many conventional approaches to strengthening-steels typically involve the loss of useful ductility.In this study, 34 CrNiMo6 Steel having high strength and ductility is produced by laser solid forming(LSF)with a quenching-tempering(QT) treatment. Tempering of bainite is mainly by solid phase transformation in the previous LSF layers during the LSF process. The stable microstructure of LSF consists of ferrite and fine carbides. The microstructure transfers to tempered sorbite after heat-treatment. The tensile properties of the LSF steel meet those of the wrought standard. The UTS and elongation of LSF sample at 858 MPa, 19.2%, respectively, are greater than those of the wrought. The QT treatment enhanced the ultimate tensile strength and yield strength of the LSF sample. The ultimate tensile strength, yield strength, reduction in area, and elongation of the LSF+QT sample at 980 MPa, 916 MPa, 58.9%, and 13.9%,respectively, are greater than those of the wrought standard. The yield strength of the LSF+QT sample is approximately 1.27 times that of the wrought. The LSF samples failed in a ductile fracture mode, while the LSF+QT samples showed mixed-mode failure. The defects have only a small effect on the tensile properties owing to the excellent ductility of the LSF sample. | Chunping Huang Xin Lin Fencheng Liu Haiou Yang Weidong Huang | 2019 | Journal of Materials Science & Technology2019，35，2： | 6 |
| 3 | Design Fe-based Eutectic Medium-Entropy Alloys Fe_2NiCrNb_x显示文摘High-entropy alloys have attracted broad research interests due to their unique and intriguing mechanical properties. As a category of high-entropy alloys, eutectic high-entropy alloys combine the advantages of eutectic and high-entropy alloys, with excellent mechanical properties and casting properties. Some eutectic high-entropy alloys have been developed and shown exciting properties. In this paper, based on the physical metallurgy of eutectic high-entropy alloy, medium-entropy alloy Fe_(2)NiCrNb_(x) was designed. The as-cast alloy is composed of FCC and Laves phases, Nb element promotes the formation of primary Laves phase, and the hardness of the alloy increases with the increase in Nb element. Among the four alloys, the eutectic chemical composition at eutectic point is Fe_(2)NiCrNb_(0.34);the alloy has a good strength and plastic balance. The ultimate comprehensive strength is 2267 MPa, and the fracture strain is 30.8%. The experiment data and analyses identified the eutectic points and the excellent mechanical behavior. Moreover, the expensive Co element was replaced by Fe element. This cheap medium-entropy alloy has promising prospect in the consideration of the cost performance ratio. | Jiafen Song Zishu Chai Jian Zheng Qingfeng Wu Feng He Zenan Yang Junjie Li Jincheng Wang Haiou Yang Zhijun Wang | 2021 | Acta Metallurgica Sinica(English Letters)2021，34，8： | 2 |
| 4 | Laser powder bed fusion of high-strength Sc/Zr-modified Al–Mg alloy:phase selection,microstructural/mechanical heterogeneity,and tensile deformation behavior显示文摘Laser powder bed fusion(L-PBF)of Sc/Zr-modified Al-based alloys has recently become a promising method for developing a new generation of high-performance Al alloys.To clarify the modification roles of Sc/Zr elements,an Al–4.66Mg–0.48Mn–0.72Sc–0.33Zr(wt.%)alloy was processed using L-PBF.The effect of the local solidification condition of the molten pool on the precipitation behavior of primary Al_(3)(Sc,Zr)was analyzed based on time-dependent nucleation theory.It was found that primary Al_(3)(Sc,Zr)inevitably precipitated at the fusion boundary,while its precipitation could be effectively suppressed in the inner region of the molten pool.This subsequently induced the formation of a heterogeneousα-Al matrix.After direct aging,the heredity of solidification microstructure introduced heterogeneous secondary Al_(3)(Sc,Zr)precipitates withinα-Al matrix.Owing to the inverse relationship between grain boundary strengthening and precipitation strengthening,the direct-aged sample with dual heterogeneous structures exhibited reduced mechanical heterogeneity,resulting in lowered hetero-deformation-induced hardening.The low strain-hardening capability in the direct-aged sample promoted necking instability while inducing a large Lüders elongation,which effectively improved the tensile ductility. | Zihong Wang Xin Lin Nan Kang Jing Chen Hua Tan Zhe Feng Zehao Qin Haiou Yang Weidong Huang | 2021 | Journal of Materials Science & Technology2021，，36： | 2 |
| 5 | Selective removal of nitrate from water by a macroporous strong basic anion exchange resin显示文摘 | SONG Haiou ZHOU Yang LI Aimin | 2012 | Desalination2012，296，： | 1 |
| 6 | The influences of processing parameters on forming characterizations during laser rapid forming显示文摘 | Li Yanming Yang Haiou Lin Xin | 2003 | Materials Science and Engineering2003，360，12： | 1 |
| 7 | Microstructure and Mechanical Properties of Selective Laser Melted Al–2.51Mn–2.71Mg–0.55Sc–0.29Cu–0.31Zn Alloy Designed by Supersaturated Solid Solution显示文摘Selective laser melting(SLM)of aluminium alloys for lightweight application is arousing widespread interest,but the available alloy compositions are limited due to unsatisfactory mechanical performances.The rapid solidifi cation of SLM provides a pathway to design a novel alloy composition with extended solubility.This strategy is demonstrated by an additively manufactured novel Al–2.51 Mn–2.71 Mg–0.55 Sc–0.29 Cu–0.31 Zn alloy with the supersaturated solid solution in the present study.The microstructure of as-build sample is characterized with multi-modal grains with the fi ne equiaxed grain(FEG,~800 nm)at molten pool boundaries,coarse equiaxed grain(CEG,~2μm)and columnar dendrites(CD,~4μm)inside the molten pool,which relates to the precipitations type and distribution.It is observable that Al 3(Sc,Zr)precipitation particles with the size of~50 nm are dispersed in the FEG zone,while the interior of CEG shows no Al3(Sc,Zr)particle which only exists at the CEG boundaries.Regardless of FEG,CEG or CD,the slender Al6 Mn precipitation with the length of~500 nm is distributed along the grain boundaries.Meanwhile,a lot of vacancies and thickness fringes are detected in the FEG zone,which confi rms the supersaturated solid solution in laser rapid solidifi cation.The ultimate tensile strength and yield strength of the as-printed sample are~380 MPa and~330 MPa,respectively,with elongation~14%,which increase to~440 MPa and~410 MPa with a reduction of elongation to~9%after heat treatment. | Minbo Wang Ruidi Li Tiechui Yuan Haiou Yang Pengda Niu Chao Chen | 2022 | Acta Metallurgica Sinica(English Letters)2022，35，3： | 1 |
| 8 | Selective removal of nitrate from water by a macroporous strong basic anion exchange resin显示文摘 | Haiou Song Yang Zhou Aimin Li Sandra Mueller | 2012 | Desalination2012，，： | 1 |
| 9 | Population dynamics and kinship of the Chinese rural elderly: A microsimulation study显示文摘 | Haiou Yang | | Journal of Cross - Cultural Gerontology0，，： | 1 |
| 10 | Selective removal of nitrate from water by a macroporous strong basic anion exchange resin显示文摘 | Haiou Song Yang Zhou Aimin Li Sandra Mueller | 2012 | Desalination2012，，： | 1 |
| 11 | Stressed carbon nanotube devices for high tunability,high quality factor, single mode GHz resonators显示文摘The emerging applications of nanoelectromechanical systems (NEMS) inground-state cooling, quantum manipulation, communication devices, etc., callfor a nanoresonator with high frequency, quality factor, and tunability, as wellas easy integration. Here we show that such a nanoresonator can be achievedby using a unique assembly technique that transfers the stressed inner shell ofcarbon nanotubes (CNTs) to a self-aligned device geometry. The as-fabricatednanoresonator shows excellent comprehensive performance, i.e., high frequency(2-3 GHz), high tunability (80-110 MHz/V), high quality factor (3×10^4), andsingle mode operation. The defect-free nature of the inner shell of the CNTgives rise to a high quality factor, and the preloaded tension improves theresonant frequency and tunability. This resonator with excellent performancealso enables the integration of homogeneous devices and will play a key role inthe emerging applications of NEMS. | Xinhe Wang Dong Zhu Xinhe Yang Long Yuan Haiou Li Jiangtao Wang Mo Chen Guangwei Deng Wenjie Liang Qunqing Li Shoushan Fan Guoping Guo Kaili Jiang | 2018 | Nano Research2018，11，11： | 1 |
| 12 | The practice and experience of strengthening the legal and service awareness of emergency nurses in the prevention of nurse patient disputes 显示文摘 | L1N Hainiao KEN Haiou YANG Jianwei | 2014 | Journal of Traditional Chinese Medicine Management2014，，1： | 1 |
| 13 | The influences of processing parameters on forming characterizations during laser rapid forming显示文摘 | Yanmin Li Haiou Yang Xin Lin | 2003 | Materials Science and Engineering A2003，360，12： | 1 |
| 14 | The influences of processing parameters on forming characterizations during laser rapid forming 显示文摘 | Yanmin Li Haiou Yang Xin Lin | 2003 | Materials Science and Engineering A2003，360，： | 1 |
| 15 | Dissipative Particle Dynamics Study on Platycodin's Solubilization Enhancing Effect Towards Five Drug Components显示文摘In this study,a dissipative particle dynamics mehtod was used to study the solubilization enhancing effect of platycodin towards 5 different drug components.Two factors were mainly considered,including the ,XlogP value of drug components and the sugar chain length of platycodin.As a result,it was found that there was an optimal drug XlogP value for the solubilization enhancing effect of platycodin,and it was different between the drug's own XlogP value and the optimal drug XlogP value of platycodin that determines the solubilization enhancing effect. | WU Zhimin DING Haiou YANG Chang GUO Shujuan DAI Xingxing SHI Xinyuan | 2019 | Chemical Research in Chinese Universities2019，35，1： | 0 |
| 16 | Coal and gas outburst prediction model based on principal component analysis and improved support vector machine显示文摘In order to predict the coal outburst risk quickly and accurately,a PCA-FA-SVM based coal and gas outburst risk prediction model was designed.Principal component analysis(PCA)was used to pre-process the original data samples,extract the principal components of the samples,use firefly algorithm(FA)to improve the support vector machine model,and compare and analyze the prediction results of PCA-FA-SVM model with BP model,FA-SVM model,FA-BP model and SVM model.Accuracy rate,recall rate,Macro-F1 and model prediction time were used as evaluation indexes.The results show that:Principal component analysis improves the prediction efficiency and accuracy of FA-SVM model.The accuracy rate of PCA-FA-SVM model predicting coal and gas outburst risk is 0.962,recall rate is 0.955,Macro-F1 is 0.957,and model prediction time is 0.312s.Compared with other models,The comprehensive performance of PCA-FA-SVM model is better. | Chaojun Fan Xinfeng Lai Haiou Wen Lei Yang | 2023 | Geohazard Mechanics2023，1，4： | 0 |
| 17 | Reasonable start time of carbon dioxide injection in enhanced coalbed methane recovery involving thermal-hydraulic-mechanical couplings显示文摘Injection of gas (CO_(2)) into coal seams is an effective method to benefit from both CO_(2) geological storage and coalbed methane recovery. Based on the dual pore structure of coal mass, and the Weibull distribution of fracture permeability, a menmal-hydraulic-mechanical (THM) coupling mathematical model is proposed involving the non-isothermal adsorption of binary gases, dynamic gas diffusion between matrix and fractures, multiphase seepage, coal deformation, heat conduction and heat convection. This mathematical model is applied to study the process of CO_(2)-enhanced coalbed methane recovery (CO_(2)-ECBM). Results show that the CH4 content of CO_(2)-ECBM in coal seam decreases significantly when compared with that of regular drainage, and decreases rapidly in the early stage but slowly in the later stage. Coal seam permeability evolution is triggered by changes in gas adsorption/desorption, temperature and effective stress. For regular drainage, the early permeability shows a decreasing trend dominated by the increase of effective stress, while the later permeability shows an increasing trend dominated by the CH4 desorption caused shrinkage of coal matrix. For CO_(2)-ECBM, the permeability in coal seam generally shows a downward trend due to both matrix swelling induced by gas adsorption and thermal expansion, particularly near injection well. There appears an increased and delayed peak production rate of CH4. The CH4 production rate of CO_(2)-ECBM is always higher than that of regular drainage. The CH4 cumulative production and CO_(2) cumulative storage linearly increase with time, and the CH4 cumulative production of CO_(2)-ECBM increased by 39.2% in the duration of 5000 d compared with regular drainage. Reasonable CO_(2) injection starting time can overcome the issue of early CO_(2) breakthrough and ineffective increase of CH4 production. In the studied case, the optimal injection starting time is 2500 d. Compared with the simultaneous CH4 extraction and CO_(2) injection, the CH4 cumulative production of optimal time has increased by 30.1%. The research provides a reference for determining the reasonable CO_(2) injection time under similar conditions. | Chaojun FAN Lei YANG Bin XIAO Lijun ZHOU Haiou WEN Hao SUN | 2023 | Frontiers of Earth Science2023，17，3： | 0 |
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