Strain rate and temperature effects on tensile behavior of Ti/Al multilayered nanowire: A molecular dynamics study

被引：19

作者：

Liu, Lanting ^{[1
]}

Deng, Qiong ^{[1
]}

Su, Mengjia ^{[1
]}

An, Minrong ^{[2
]}

Wang, Ruifeng ^{[1
]}

机构：

[1] Northwestern Polytech Univ, Fundamental Sci Aircraft Struct Mech & Strength L, Xian 710072, Shaanxi, Peoples R China

[2] Xian Shiyou Univ, Coll Mat Sci & Engn, Xian 710065, Shaanxi, Peoples R China

来源：

SUPERLATTICES AND MICROSTRUCTURES | 2019年 / 135卷

基金：

中国国家自然科学基金;

关键词：

Ti/Al multilayered nanowire; Strain rate effect; Temperature effect; Molecular dynamics simulation; DEFORMATION MECHANISM; SIZE; TRANSITION; DEPENDENCE; STRENGTH; AL; NANOPILLARS; SIMULATION; NUCLEATION;

D O I：

10.1016/j.spmi.2019.106272

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

In this paper, the tensile behavior of Ti/Al multilayered nanowire was investigated by molecular dynamics simulation under a large range of strain rates and temperatures. The results show that strain rate and temperature significantly affect the tensile properties of Ti/Al multilayered nanowire. The value of strain rate sensitivity (m) changes at the critical strain rate of 1 x 10(9) s(-1) above which the strength increases rapidly. Amorphization appears and dominates the plastic deformation of the nanowire above 1 x 10(9) s(-1), and a superplasticity of the nanowire is observed. A linear relationship between the strength of the nanowire and the square root of temperature (T-1/2) is founded. The surface nucleation plays a crucial role in the effects of strain rate and temperature on the microstructure evolution of the nanowire. The results in this study will enrich the exploration of Ti-based multilayered materials.

引用

页数：12

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