NiAl应力诱发马氏体的分子动力学模拟  

MOLECULAR DYNAMICS STUDY ON NiAl STRESS INDUCED MARTENSITE

作　　者：沙宪伟[1] 张修睦[1] 李依依 

机构地区：[1]中国科学院金属研究所

出　　处：《材料研究学报》1997年第3期280-286,共7页Chinese Journal of Materials Research

基　　金：国家自然科学基金!59271019

摘　　要：利用嵌入原子势函数，对标准化学计量比NiAl合金的应力诱发马氏体相变进行了分子动力学模拟．在拉应力作用下，3R结构的应力诱发马氏体从系统中下部开始形核.其长大过程为：先形成蝶状马氏体，并产生转变孪晶→不同取向的马氏体逐渐转化和合并→得到李晶马氏体依次排列的微观结构．分析了应变的变化过程，探讨了马氏体形核的微观机理.Molecular dynamics simulation of stress induced martensitic transformations in stiochoimetric NiAl has been performed via embedded-atom type potential. With the help of a tensile force,stress induced martensite with 3R structure nucleated near the lower centre; and the growth processes can be described as: butterny martensite formed initially, and transformation twins appeared coincidentally;martensites with different orientation transform and combine; martensite twins sequence existed in the finial structure. The evolution of strain has been analysed, and the nucleation mechanism of stress induced martensite has been discussed.

关 键 词：应力诱发马氏体 分子动力学模拟 马氏体相变 

分 类 号：TG113.12[金属学及工艺—物理冶金]