Orientation and strain rate dependent tensile behavior of single crystal titanium nanowires by molecular dynamics simulations

作     者：Le Chang Chang-Yu Zhou Hong-Xi Liu Jian Li Xiao-Hua He 

作者机构：School of Mechanical and Power EngineeringNanjing Tech University Nanjing 211816 China School of Mechanical EngineeringJiangsu University of Science and Technology Zhenjiang 212000 China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2018年第34卷第5期

页      面：864-877页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0817[工学-化学工程与技术] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 070301[理学-无机化学] 0702[理学-物理学] 

基　　金：the financial supports of the National Natural Science Foundation of China (Nos.51475223,51675260) the Graduate Student Scientific Innovative Project of Jiangsu Province (No.KYLX16 0595) 

主　　题：Molecular dynamics Single crystal titanium nanowires Strain rate Orientation Plastic deformation mechanisms 

摘      要：Molecular dynamics simulation was employed to study the tensile behavior of single crystal titanium nanowires（NWs）with[112^-0],[1^-100] and[0001]orientations at different strain rates from 10^8s^-1 to 10^11s^-*** strain rates are above 10^10s^-1,the state transformation from HCP structure to amorphous state leads to super plasticity of Ti NWs,which is similar to FCC *** strain rates are below 10^10s^-1,deformation mechanisms of Ti NWs show strong dependence on *** [112^-0] orientated NW.{101^-1} compression twins（CTs）and the frequently activated transformation between CTs and deformation faults lead to higher plasticity than the other two orientated ***,tensile deformation process along [112^-0] orientation is insensitive to strain *** [1^-100] orientated NW,prismaticslip is the main deformation mode at 10^8s^-*** the strain rate increases,more types of dislocations are activated during plastic deformation ***[0001]orientated NW,{101^-2} extension twinning is the main deformation mechanism,inducing the yield stress of [0001] orientated NW,which has the highest strain rate *** number of initial nucleated twins increases while the saturation twin volume fraction decreases nonlinearly with increasing strain rate.