摘要
利用分子动力学方法研究了非晶Ti3Al合金拉伸过程中的晶化行为,模拟结果表明局部塑性变形导致非晶合金晶化.从微观结构演化的角度分析了拉伸过程中的晶化机理,局部剪切导致拉伸过程中晶粒发生成核与合并,最终生成的晶粒具有面心立方结构.晶核的生长过程伴随着应力强化现象,非晶相中的纳米晶粒能提高非晶合金材料的强度.
The crystallization of Ti3 Al amorphous alloy during tensile deformation was studied with molecular dynamics. The simulation results show that the crystallization of amorphous alloy is induced by the local plastic deformation. The microstructure evolution was analyzed in the tension process. It is found that the nucleation and growth are induced by the shear localization and the final crystal phase has fcc structure. It is also found that the crystallization process is accompanied by strengthening of the material. The nanocrystal grains embedded in the amorphous phase can enhance the rigidity of the sample.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2007年第3期1489-1493,共5页
Acta Physica Sinica
基金
国家自然科学基金(批准号:10502047)资助的课题.
关键词
非晶合金
变形晶化
分子动力学
TI3AL合金
amorphous alloy, deformation-induced crystallization, molecular dynamics