摘要
室温(300K)情况下,利用分子动力学方法对γ-TiAl单晶纳米杆的拉伸变形过程进行了模拟研究,得到了应力应变曲线,并对其变形机理进行了分析,结果表明,γ-TiAl单晶纳米杆在室温下的形变机制为1/2[110]普通位错及孪生,且首先发生1/6[112]的孪生形变,随后通过部分位错1/6[211]和1/6[121]的反应形成1/2[110]普通位错.
The tension deformation of nano-single crystal γ-TiAl intermetallics was studied by using the molecular dynamics （MD） method at 300 K. The results indicate that the deformation mechanism of the nano-single crystal γ-TiAl is the 1/2[^-1^-10] direction ordinary dislocation and the twinning. It shows that the 1/6[^-11^-2] partial dislocation takes place first to form deformation-twinning. And then the 1/2[^-1^-10] ordinary dislocation is formed by the reaction of the 1/6[^-2^-1^-1] partial dislocation and the 1/6[^-1^-21] partial dislocation.
基金
国家自然科学基金(90505002)资助
关键词
孪晶
普通位错
分子动力学
twinning
ordinary dislocation
molecular dynamics
