Atomistic Investigation of Shock-Induced Amorphization within Micro-shear Bands in Hexagonal Close-Packed Titanium  

作　　者：Z.C.Meng K.G.Wang T.Ali D.Li C.G.Bai D.S.Xu S.J.Li A.H.Feng G.J.Cao J.H.Yao Q.B.Fan H.Wang R.Yang 

机构地区：[1]Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China [2]School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China [3]Interdisciplinary Centre for Additive Manufacturing(ICAM),School of Materials and Chemistry,University of Shanghai for Science and Technology,Shanghai 200093,China [4]School of Materials Science and Engineering,Tongji University,Shanghai 201804,China [5]Key Laboratory for Light-Weight Materials,Nanjing Tech University,Nanjing 210009,China [6]National Key Laboratory of Science and Technology on Materials Under Shock and Impact,School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China [7]Beijing Institute of Technology Chongqing Innovation Center,Chongqing 401135,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2024年第9期1590-1600,共11页金属学报（英文版）

基　　金：the National Natural Science Foundation of China(U2241245,91960202 and 52271012);the National Key Laboratory Foundation of Science and Technology on Materials under Shock and Impact(6142902220301);the Aeronautical Science Foundation of China(2022Z053092001);the Shanghai Engineering Research Center of High-Performance Medical Device Materials(20DZ2255500);the Opening Project of National Key Laboratory of Shock Wave and Detonation Physics(2022JCJQLB05702).

摘　　要：The mechanical response of a single crystal titanium sample against(0001)α surface impact was investigated using molecular dynamics simulation.Remarkably,non-uniform plastic deformation was observed in the sample.At high strain rates,amorphization occurred near the edge of the contact region where severe shear strain induced a large number of stacking faults(SFs)and dislocations.In contrast,the central part of the contact region underwent less deformation with significantly fewer dislocations.Moreover,instead of amorphization by consuming SFs and dislocations,there was a gradual increase in the density of dislocations and SFs during the process of amorphization.These local amorphous regions eventually grew into shear bands.

关 键 词：Shock compression Amorphization Shear band TITANIUM Molecular dynamics 

分 类 号：TG146.23[一般工业技术—材料科学与工程]