Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第23卷    第z1期    总第1期    2013年12月

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文章编号:1004-0609(2013)S1-0207-05
α-Ti单晶失稳机制和初始塑性的多尺度研究
顾剑锋,熊  凯,刘晓晖

(上海交通大学 材料科学与工程学院,上海 200240)

摘 要: 采用晶格动力学有限元法研究α-Ti晶体单向拉伸和压缩过程中弹-塑性转变和失稳的均匀形核机制。模拟结果表明:在单向加载过程中,α-Ti理想晶格的动力学失稳特征与晶体取向和变形方式有关,并且初始塑性存在显著的各向异性和拉伸-压缩不对称性;晶体变形过程中的晶格失稳产物既有晶格畸变和位错,也观察到相变和变形孪生。

 

关键字: 钛;弹塑性变形;多尺度模拟;分子动力学;拉伸;压缩

Multiscale investigation on lattice disability mechanism and incipient plasticity in α-Ti single-crystalline
GU Jian-feng, XIONG Kai, LIU Xiao-hui

School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

Abstract:Uniaxial tension and compression of α-Ti crystal were simulated by lattice dynamics finite element method (LDFEM) to investigate the elastic-plastic transition and homogeneous nucleation mechanism of lattice disability in α-Ti. The simulation results show that lattice dynamics instability of α-Ti single crystal is associated with crystallographic and deformation model under uniaxial loading, indicating strong anisotropic incipient plasticity and tension-compression asymmetry. The predicted products of lattice disability include not only lattice distortion and dislocation but also phase transformation and deformation twining in crystal deformation process.

 

Key words: titanium; elastoplastic deformation; multiscale modeling; molecular dynamics; tension; compression

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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