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| 1 | Dislocations-induced precipitates and their effect on mechanical properties of Mg-Gd-Y-Zr alloy显示文摘Optical microscope(OM),scanning electron microscope(SEM),transmission electron microscope(TEM)and tensile machine were used to characterize the microstructures and mechanical properties of as-forged and aged Mg-9.5Gd-3.8Y-0.6Zr alloys.The results show that a novel kind of dislocation arrays,comprising parallel arranged dislocations,were obtained in the forged alloy.The arrays tend to extend parallel and are heterogeneously distributed with adjacent distances varying from 0.3μm to 1.4μm.After aging the alloy at 265°C,a large number of preferential-oriented phases were precipitated on the dislocation arrays,forming a structure of'precipitation chains'(PCs),which results in simultaneous increments of strength and ductility. | Chao You Churning Liu Yingchun Wan Bei Tang Bizheng Wang Yonghao Gao Xiuzhu Han | 2019 | Journal of Magnesium and Alloys2019，7，3： | 8 |
| 2 | Enhanced Hall-Petch strengthening in graphene/Cu nanocomposites显示文摘Grain size dependent strength,known as Hall-Petch relation,has been approved to be valid in crystalline metals and alloys.However,softening would eventually occur as grain size reduced into nanoscale that below a critical value.Hence,it is essential to find a way to break the strength limitation by avoiding the deformation mechanism transition from dislocation-mediated to grain-boundary-mediated processes.By replacing grain boundary(GB)of nanocrystalline Cu with graphene,in the present study,molecular dynamics simulations show that graphene-boundary(GrB)embedded GrB/Cu nanocomposites exhibit enhanced enlarged Hall-Petch slope with decreasing grain size.The absence of inverse-Hall-Petch relation and the extremely high strength derived at the GrB/Cu nanocomposites were interpreted by the high back stress and abundant dislocation activity that attributed from the high-degree of heterogeneous structure of the nanocomposites. | Shuang Zhang Fei Wang Ping Huang | 2021 | Journal of Materials Science & Technology2021，，28： | 7 |
| 3 | Deformation and damage features of a Re/Ru-containing single crystal nickel base superalloy during creep at elevated temperature显示文摘The deformation and damage features of a 4.5%Re/3.0%Ru-containing single crystal nickel-based superalloy during the creep in the temperature range of 1040–1070 °C and stress range of 137–180 MPa was investigated by means of creep properties measurement and contrast analysis of dislocation configuration. The results showed that the alloy exhibited a better creep resistance in the range of the testing temperatures and stresses, the deformation mechanism of the alloy during steady state creep was dislocations climbing over the rafted γ′ phase.In the latter period of creep, the deformation mechanism of the alloy was dislocations shearing into the rafted γ′phase. It is believed that the dislocations shearing into γ′ phase may cross-slip from {111} to {100} planes for forming the K-W locks to restrain the slipping and cross-slipping of dislocations on {111} plane. As the creep goes on, the alternate slipping of dislocations results in the twisted of the rafted γ′ phase to promote the initiation and propagation of cracks along the γ/γ′ interfaces up to creep fracture, which is considered to be the damage and fracture feature of alloy during creep at high temperature. | Guoqi Zhao Sugui Tian Shunke Zhang Ning Tian Lirong Liu | 2019 | Progress in Natural Science:Materials International2019，29，2： | 4 |
| 4 | Surface defect engineering of metal oxides photocatalyst for energy application and water treatment显示文摘Despite metal oxides offer excellent characteristics in the field of photocatalysis,they often suffer from charge carrier recombination as well as limited visible response,which indeed reduce the charge kinetics process and ultimately reduce the photocatalytic output.Defect engineering is a sophisticated technique to manufacture defects and alter the geometric structure and chemical environment of the host.The present study provides an all-inclusive outline of recent developments on the classification of metal oxide defects based on the dimensions of a host crystal lattice.Precisely,surface modification of metal oxides through 0D(point),1D(line),2D(planar),and 3D(volume)defects with their subsequent mechanism and impact on photocatalytic performance are presented.By wisely amending the morphology(cores along with the shells)and electronic structure of metal oxide photocatalysts(TiO_(2),ZnO,Bi_(2)O_(3),Fe_(2)O_(4) etc.)through different attuned and veritable approaches,their photocatalytic activity can be substantially improved.Optimal studies on defect engineering not only expose the altered physicochemical features but also modulate the electron-hole pair dynamics,stability,and active radical production for various photoredox reactions.Altered atomic,as well as electronic configuration,facilitated a photocatalyst material to have different optical features,adsorption properties along with improved carrier transfer as well as isolation rate.Thus,the systematic exploration of photocatalytic rudiments of defect rich metal oxide for various applications such as H_(2) evolution,CO_(2) reduction,pollutant degradation,and bacterial disinfection could bring significant research advancement in this field. | Pankaj Raizada Vatika Soni Abhinandan Kumar Pardeep Singh Aftab Aslam Parwaz Khan Abdullah M.Asiri Vijay Kumar Thakur Van-Huy Nguyen | 2021 | Journal of Materiomics2021，7，2： | 4 |
| 5 | Asymmetrical traumatic bilateral hip dislocations with hemodynamic instability and an unstable pelvic ring: Case report and review of literature显示文摘Simultaneous anterior and posterior traumatic dislocations of both hips are very rare. Only 33 cases have been previously reported in the English language literature. Although they were all due to high-energy injuries, they were hemodynamically stable and had a stable pelvic ring. We report a unique case of asymmetrical hip dislocations with an unstable pelvic ring and hemodynamic instability. A 40-year-old man was injured in a high-energy motor vehicle accident. He was hemodynamically unstable when he presented in the emergency department. Radiolographs showed asymmetrical dislocations of both hips with an unstable pelvic ring. Under general anesthesia, he had closed reduction of the dislocations of both hips, followed by temporary stabilization with an external fixator. Transcatheter arterial embolization was performed to stop active pelvic bleeding. Delayed open reduction and internal fixation was performed 12 d later with anterior and posterior plates. The patient recovered well with an uneventful post-operative course. Asymmetrical bilateral hip dislocations with pelvic ring instability caused by trauma, as presented in this case, is very rare and potentially life threatening. Prompt treatment can give a good outcome. | Kai Huang Grey Giddins Jian-Fang Zhang Jian-Wei Lu Jun-Ming Wan Peng-Li Zhang Shao-Yu Zhu | 2018 | World Journal of Clinical Cases2018，6，5： | 4 |
| 6 | Ipsilateral dislocation of the radial head associated with fracture of distal end of the radius: a case report and review of the literature显示文摘在成年人的光线的头的脱臼是不平常的。光线的头的同时的脱臼和 ipsilateral 的骨折没有另外的联系损害的半径的远侧的结束是极其稀罕的。根据我们知道,在损害的一个不平常的模式以后的如此的损害很少在英语文学被报导了。没有任何联系损害或 comorbidity,我们报导如此的一个案例。关上的减小在损害以后在二个小时以内被执行,结果是令人满意的。Immobilisation 被继续 3 个星期。渐渐的动员在 physiotherapist 的管理下面在灰浆的移动以后被开始。在 6 months’后续病人没有剩余疼痛非常近与完整的屈曲与扩展。有限制的几乎完整的旋后上次,内转的 10 度被完成。没有肘的不稳定性的证据。 | Vinay Gupta Zile Singh Kundu Maneet Kaur Pradeep Kamboj Jitesh Gawande | 2013 | Chinese Journal of Traumatology2013，16，3： | 3 |
| 7 | Research on the influence of machining introduced sub-surface defects and residue stress upon the mechanical properties of single crystal copper显示文摘Large scale molecular dynamics simulations of nanomachining and stretching of single crystal copper are performed to analyze the machining process’ influence on the material’s mechanical properties. The simulation results show that the machining process will introduce interfacial defects inside the specimen and enhance the compressive stress beneath the surface. Gener- ally speaking, interfacial defects lead to the decrease of the strength limit, while residue compressive stress can enhance the elastic limit and even the strength limit. Various machining parameters are adopted to investigate their influence on the me- chanical behavior of machined specimen. Lower cutting speed and smaller cutting depth lead to less defects and greater residue compressive stress, which brings about better mechanical properties. The elastic limit increases by 36.8% under the cutting depth of 0.73 nm and decreases by 21.1% under the cutting depth of 1.46 nm. The strength limit increases by 7.7% under the cutting speed of 100 m/s and decreases by 28.2% under the cutting speed of 300 m/s. | CHEN MingJun, XIAO GaoBo, CHEN JiaXuan & WU ChunYa Harbin Institute of Technology, Harbin 150001, China | 2010 | Science China(Technological Sciences)2010，53，12： | 3 |
| 8 | THREE-DIMENSIONAL ANALYSIS OF SCALE DEPENDENCE OF SUB-MICRON POLYCRYSTALS DUE TO CONFIGURATION ENTROPY显示文摘The authors proposed a plausible explanation for the deviation ofexperimental data for sub-micron polycrystals from the Hall-Perch relation by in-troducing the configuration entropy.The present paper extends the previous two-dimensional analysis to the three-dimensional case.The statistical distribution ofdislocation lengths within a spherical grain and the bow-out of dislocations are con-sidered.According to Ashby’s model,analyses are pursued for the statistically storeddislocations and geometrically necessary dislocations,respectively.It is confirmedthat the configuration entropy model can predict the abnormal Hall-Petch depen-dence for grain sizes in the sub-micron range. | 杨强 杨卫 | 2001 | Acta Mechanica Sinica2001，17，2： | 3 |
| 9 | Interactions between dislocations and twins in deformed titanium aluminide crystals显示文摘Using scanning, transmission electron microscopy and aberration-corrected scanning transmission electron microscopy, we have studied the interactions between dislocations and twins in impact deformed polysynthetic twinned TiAl crystal. The 1/3 < 111] and 1/6 < 211] step dislocations on coherent twin boundaries reveal the interactions of glissile 1/2 < 101> dislocations with the coherent twin boundaries.An abnormal stacking fault was found adjacent to the coherent twin boundary. It has the same stacking sequence but different atom species in the [110] direction with an additional displacement of 1/4[110]in two neighboring {111} layers, and is likely induced by the slip of a 1/12[112](i.e. 1/4[110] + 1/6[211])dislocation. | Guang Yang Shang-Yi Ma Kui Du Dong-Sheng Xu Sen Chen Yang Qi Heng-Qiang Ye | 2019 | Journal of Materials Science & Technology2019，35，3： | 2 |
| 10 | Evolution of interfacial dislocation networks during long term thermal aging in Ni-based single crystal superalloy DD5显示文摘Interfacial dislocations found in single crystal superalloys after long term thermal aging have an important effect on mechanical properties. Long term thermal aging tests for DD5 single crystal superalloy were carried out at 1,100 ℃ for 20, 100, 200, 500 and 1000 h, and then cooled by air. The effect of long term thermal aging on the dislocation networks at the γ/γ' interfaces was investigated by FE-SEM. Results showed that during the long term thermal aging at 1,100 ℃, misfit dislocations formed firstly and then reorientation in the(001) interfacial planes occurred. Different types of square or rectangular dislocation network form by dislocation reaction. Square dislocation networks consisting of four groups of dislocations can transform into octagonal dislocation networks, and then form another square dislocation network by dislocation reaction. Rectangular dislocation networks can also transform into hexagonal dislocation networks. The interfacial dislocation networks promote the γ' phase rafting process. The dislocation networks spacings become smaller and smaller, leading to the effective lattice misfit increasing from-0.10% to-0.32%. | Qiang Gao Li-rong Liu Xiao-hua Tang Zhi-jiang Peng Ming-jun Zhang Su-gui Tian | 2019 | China Foundry2019，16，1： | 2 |
| 11 | Unique cyclic deformation behavior of a heavily alloyed Al-Si piston alloy at different temperatures | Guohua Zhang a,c,Bingchao Li b,Jianxin Zhang b,Zengjian Feng c,Zuoshan Wei c,Wei Cai a a School of Materials Science and Engineering,Harbin Institute of Technology,92 West Dazhi Street,P.O.Box 405,Harbin 150001,China b School of Materials Science and Engineering,Shandong University,17923 Jingshi Road,Jinan 250061,China c Shandong Binzhou Bohai Piston Co.,Ltd,569 Bohai Ershiyi Road,Binzhou 256602,China | 2012 | Progress in Natural Science:Materials International2012，22，5： | 2 |
| 12 | Discrimination of dislocations in 4H-SiC by inclination angles of molten-alkali etched pits显示文摘Discrimination of dislocations is critical to the statistics of dislocation densities in 4H silicon carbide(4H-SiC),which are routinely used to evaluate the quality of 4H-SiC single crystals and homoepitaxial layers.In this work,we show that the inclination angles of the etch pits of molten-alkali etched 4H-SiC can be adopted to discriminate threading screw dislocations(TSDs),threading edge dislocations(TEDs)and basal plane dislocations(BPDs)in 4H-SiC.In n-type 4H-SiC,the inclination angles of the etch pits of TSDs,TEDs and BPDs in molten-alkali etched 4H-SiC are in the ranges of 27°−35°,8°−15°and 2°−4°,respectively.In semi-insulating 4H-SiC,the inclination angles of the etch pits of TSDs and TEDs are in the ranges of 31°−34°and 21°−24°,respectively.The inclination angles of dislocation-related etch pits are independent of the etching duration,which facilitates the discrimination and statistic of dislocations in 4H-SiC.More significantly,the inclination angle of a threading mixed dislocations(TMDs)is found to consist of characteristic angles of both TEDs and TSDs.This enables to distinguish TMDs from TSDs in 4H-SiC. | Guang Yang Hao Luo Jiajun Li Qinqin Shao Yazhe Wang Ruzhong Zhu Xi Zhang Lihui Song Yiqiang Zhang Lingbo Xu Can Cui Xiaodong Pi Deren Yang Rong Wang | 2022 | Journal of Semiconductors2022，43，12： | 2 |
| 13 | Enhancing strength and ductility of AlSi10Mg fabricated by selective laser melting by TiB_(2)nanoparticles显示文摘In the metallic components fabricated by the emerging selective laser melting(SLM)technology,most strategies used for strengthening the materials sacrifice the ductility,leading to the so-called strengthductility trade-off.In the present study,we report that the strength and ductility of materials can be enhanced simultaneously by introducing nanoparticles,which can break the trade-off of the metallic materials.In the case of in-situ nano-TiB_(2)decorated AlSi10Mg composites,the introduced nanoparticles lead to columnar-to-equiaxed transition,grain refinement and texture elimination.With increasing content of nanoparticles,the strength increases continually.Significantly,the ductility first increases and then decreases.Our results show that the ductility is controlled by the competition between the crack-induced catastrophic fracture and ductile fracture associated with dislocation activities.The first increase of ductility is mainly attributed to the suppression of crack-induced catastrophic fracture when TiB_(2)nanoparticles present.With the further increase of TiB_(2)nanoparticles,the subsequent decrease of ductility is mainly controlled by dislocation activities.Thus,the materials will exhibit the optimum strength and ductility combination in a certain range of TiB_(2)nanoparticles.This study clarifies the physical mechanism controlling ductility for nano-TiB_(2)decorated Al Si10Mg composites,which provides the insights for the design of structural materials. | Y.K.Xiao H.Chen Z.Y.Bian T.T.Sun H.Ding Q.Yang Y.Wu Q.Lian Z.Chen H.W.Wang | 2022 | Journal of Materials Science & Technology2022，，14： | 2 |
| 14 | In situ atomic-scale observation of dislocation behaviors in twin-structured Pt nanocrystals显示文摘The deformation mechanisms of twin-structured metallic materials have attracted great interest.Though previous theoretical predictions have suggested that the repulsive force of the twin boundary(TB)can significantly affect the deformation of twinstructured metals,it remains unclear whether this prediction applies to experimental conditions.In this paper,the atomic-scaled deformation process of twin-structured Pt nanocrystals was in situ observed using our home-made device in a high-resolution transmission electron microscope.We have shown that the plastic deformation of the twin-structured Pt nanocrystals was governed by full dislocation generation as well as Lomer dislocation(LD)lock formation and destruction.After LD locks were destructed,these full dislocations tended to move towards the surface of the nanocrystals.The findings revealed that due to the ultra-high repulsive force of TB on dislocation,there was no dislocation-TB reaction during the deformation.These findings can enrich our understanding of the dislocation behaviors of twin-structured nanocrystals. | GUO YiZhong SUN Tao FU LiBo HAO LongHu HUANG Ming WEI RuJian LUO JunFeng HE Xin WANG XingQuan XIONG XiaoDong WANG LiHua HAN XiaoDong | 2021 | Science China(Technological Sciences)2021，64，3： | 2 |
| 15 | Weakened interlayer coupling in two-dimensional MoSe2 flakes with screw dislocations显示文摘The screw dislocations are intriguing defects that are often observed in natural and artificial materials. The dislocation spirals break the reflection and inversion symmetries of the lattices and modify the interlayer coupling in layer-structured materials, inducing additional complexity in layer stacking and thus novel properties in materials. Here, we report on the interlayer coupling of two-dimensional (2D) MoSe2 flakes with screw dislocations by atomic force microscopy (AFM), Raman spectra and photoluminescence (PL) spectra. By controlling the supersaturation conditions, 2D MoSe2 flakes with screw dislocations are grown on amorphous SiO2 substrates by chemical vapor deposition (CVD). AFM measurements reveal that the interlayer spacing in such 2D MoSe2 flakes with screw dislocation is slightly widened with respect to the normal AA- or AB-stacked ones due to the presence of the screw dislocations. Raman and PL spectra show that the interlayer coupling is weaker and thus the band gap is wider than that in the normal AA- or AB-stacked ones. Our work demonstrates that the interlayer coupling of 2D transition metal dichalcogenides (TMDCs) flakes can be tuned by the induction of screw dislocations, which is very helpful for developing novel catalysts and electronic devices. | Xiangzhuo Wang Huixia Yang Rong Yang Qinsheng Wang Jingchuan Zheng Lu Qiao Xianglin Peng Yongkai Li Dongyun Chen Xiaolu Xiong Junxi Duan Guangyu Zhang Jie Ma Junfeng Han Wende Xiao Yugui Yao | 2019 | Nano Research2019，12，8： | 1 |
| 16 | Creep behavior of AJ62 Magnesium-Aluminum-Strontium alloy显示文摘Creep tests were conducted in uniaxial compression to evaluate the creep behavior of magnesium-aluminum-strontium alloy at temperatures from 373 to 673 K.Stress dependencies of the creep rate over the whole interval of temperatures and stresses can be well described phenomenologically by the Garofalo sine hyperbolic equation modified by the inclusion of a threshold stress.The threshold stress increases with decreasing temperature.Creep data normalized by a diffusion coefficient and shear modulus clearly reveal the existence of two different regions.Possible mechanisms by which plastic deformation takes place have been identified in both regions.The critical stress at which dislocations break away from the cloud of foreign atoms agrees well with the value determined by data normalization.At low stresses,a value of the stress exponent of n≈=3 is consistent with the model of deformation that takes place through dislocation glide controlled by dragging of solute atoms.At high stresses,the multiple regression yields the activation energy which agrees with that for prismatic glide. | F.Dobes P.Dymacek | 2020 | Journal of Magnesium and Alloys2020，8，2： | 1 |
| 17 | Cost analysis and outcomes of simple elbow dislocations显示文摘AIM: To evaluate the management, clinical outcome and cost implications of three different treatment regimes for simple elbow dislocations.METHODS: Following institutional board approval, we performed a retrospective review of all consecutive patients treated for simple elbow dislocations in a Level Ⅰ trauma centre between January 2008 and December 2010. Based on the length of elbow immobilisation(LOI), patients were divided in three groups(Group I, < 2 wk; Group Ⅱ, 2-3 wk; and Group Ⅲ, > 3 wk). Outcome was considered satisfactory when a patient could achieve a pain-free range of motion ≥ 100°(from 30° to 130°). The associated direct medical costs for the treatment of each patient were then calculated and analysed.RESULTS: We identified 80 patients who met the inclusion criteria. Due to loss to follow up, 13 patients were excluded from further analysis, leaving 67 patients for the final analysis. The mean LOI was 14 d(median 15 d; range 3-43 d) with a mean duration of hospital engagement of 67 d(median 57 d; range 10-351 d). Group Ⅲ(prolonged immobilisation) had a statistically significant worse outcome in comparison to Group Ⅰ?and Ⅱ(P = 0.04 and P = 0.01 respectively); however, there was no significant difference in the outcome between groups Ⅰ?and Ⅱ(P = 0.30). No statistically significantdifference in the direct medical costs between the groups was identified.CONCLUSION: The length of elbow immobilization doesn't influence the medical cost; however immobilisation longer than three weeks is associated with persistent stiffness and a less satisfactory clinical outcome. | Michalis Panteli Ippokratis Pountos Nikolaos K Kanakaris Theodoros H Tosounidis Peter V Giannoudis | 2015 | World Journal of Orthopedics2015，6，7： | 1 |
| 18 | Atomistic Investigation of the Influence of Hydrogen on Mechanical Response during Nanoindentation in Pure Iron显示文摘The effects of hydrogen on the mechanical response of pure iron with randomly distributed hydrogen atoms under nanoindentation were systematically investigated by molecular dynamics simulations with the aim to further understand hydrogen embrittlement mechanism in the steels.The simulations results revealed that,for the three models with[001],[110]and[111]surface normal,hydrogen reduced the critical load of the pop-in event,promoted the dislocation slipping and reduced the plastic region size and dislocation density around the indenter compared to the hydrogen free model.Meanwhile,the different mechanical responses of the three models with different surface normal were further explained in the perspective of Schmid factor. | Wenjing Lou Lin Cheng Runsheng Wang Chengyang Hu Kaiming Wu | 2023 | Acta Metallurgica Sinica(English Letters)2023，36，7： | 1 |
| 19 | Morphology characteristics of α precipitates related to the crystal defects and the strain accommodation of variant selection in a metastableβtitanium alloy显示文摘Profound and comprehensive investigations on the morphology characteristics ofαprecipitates are essential for the microstructural control of metastableβtitanium alloys.At the very beginning of aging treatment,intragranularαprecipitates with a dot-like morphology begin to generate nearby the dislocations,then those dot-likeαprecipitates with the same crystallographic orientation tend to connect with each other to develop a lath-like morphology.With the progress of aging treatment,the orientated lath-likeαprecipitates gradually combine with each other to form the V-shaped clusters or the triangular ones.The dislocations of{110}_(β)<111>βedge type are evidenced within theβgrains,and it is found that variant selection ofαprecipitates induced by the transformation strain and the interplay betweenαvariants and the dislocations are confirmed as the key factors for the formation of the V-shaped or triangular clusters.The results of this work could provide underlying knowledge on the morphology characteristics of intraguranularαprecipitates related to the crystal defects and the strain accommodation ofαvariants in metastableβtitanium alloys. | Ruifeng Dong Hongchao Kou Yuhong Zhao Xiaoyang Zhang Ling Yang Hua Hou | 2021 | Journal of Materials Science & Technology2021，，36： | 0 |
| 20 | Effects of the aluminum concentration on twin boundary motion in pre-strained magnesium alloys显示文摘We investigated the effects of Al concentration on the reciprocated motion of twin boundaries in pre-strained Mg-Al-Zn alloys through a combination of applied compression and tension,in-situ electron-backscattering diffraction observations,and high-angle annular dark-field scanning transmission electron microscopy observations.The twin growth was restricted by increased Al concentration,which resulted in the occurrence of smaller-sized twins.The reverse motion of twin boundaries was also restricted,resulting in the formation of higher fractions of secondary twins and 2–5°boundaries during reverse tension.The secondary twins and 2–5°boundaries mainly contributed to the increased ultimate tensile strength of the pre-strained Mg alloys.This effect is more significant in Mg alloys with larger pre-compression.Moreover,the increased amount of the Al solute atoms,rather than the precipitates,mainly contributed to the increased strengthening effect on the twin boundary motion.Our research contributes to development of high-strength Mg alloys by stabilizing twin boundaries. | Yujie Cui Kenta Aoyagi Huakang Bian Yuichiro Hayasaka Akihiko Chiba | 2021 | Journal of Materials Science & Technology2021，，14： | 0 |
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