摘要
利用嵌入原子类型势函数，通过分子动力学模拟方法研究了裂纹对马氏体相变的影响.裂纹尖端的应变区未能诱发马氏体形核，而且妨碍了热诱发马氏体的长大在外加拉应力作用下，应力诱发马氏作从裂纹尖端形核后，先形成蝶状马氏体；随后系统中上部也发生了马氏体形核；不同取向的马氏体在长大过程中逐渐转化和合并分析了应变的变化特点。
Molecular dynamics simulations have been pedermed to study the influence of crackon martensitic transformations in NiAI via interatomic potential of embedded atom type. The strainregion of crack can not nucleate martensites. and it also hinders the further growth of thermally inducedmartensites. Under a tensile force, the stress induced martensite initially nucleated from the crack tip.and butterfly maFtensite appeared soon. The nucleation of another martensitic variant occurred nearthe upper centre later. The different variants can transform and combine. The variations of straindistributions have been analysed, and the transformation mechanism has been discussed.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
1999年第2期135-141,共7页
Chinese Journal of Materials Research
基金
国家自然科学基金!59771036
关键词
分子动力学
马氏体相变
裂纹
镍铝合金
molecular dynamics(MD),martensitic transformation,stress induced,crack,NiAl
