摘要
应用“边-边匹配”晶体学模型,推导HCP/FCC体系中可能存在的各种晶体学位向关系.以αH/αF和cH/αH为变量,在一定的比值范围(αH/αF=0.7~1.2;cH/αH=1.5,1.6,1.7)和临界条件(晶向错配度低于10%,晶面错配度低于6%)下,得到HCP/FCC体系中8组可能出现的晶体学位向关系.最后,以Fe-Mn—Si合金为例,在具体的点阵常数下计算得到最可能的位向关系[112^-0]H/[110]F(0002)H/(11^-1)F,并通过透射电子显微分析测定了Fe-30Mn-6Si合金中面心立方结构(FCC)奥氏体和密排六方结构(HCP)马氏体的位向关系.实验测得的取向关系和用“边-边匹配”晶体学模型预测的晶体学取向关系吻合得很好,由此检验了该模型的正确性和实用性,也体现了其直观性的优点.
The edge-to-edge matching crystallographic model was used to predict all the possible crystallographic relationships between crystals that have hexagonal close packed (HCP) and face-center cubic (FCC) structures. Taking αH/αF and cH/αH as variables, while αH/αF varies from 0. 7-1. 2 and cH/αH 1.5, 1.6 and 1.7 respectively, eight groups of possible orientation relationship were obtained under the critical values (10% for interatomic spacing misfit and 6 % for interplanar distance). Finally, based on the crystal structures and lattice parameters only, the model predicted the most possible orientation relationship of [11 20^-]H/[110]F(0002)F/(11^-1)F between face-center cubic(FCC) austenite and hexagonal close packed (HCP) martensite in Fe-Mn-Si alloy. The predicted orientation relationship agrees well with the experi- mental results observed by transmission electronic microscopy, which confirms and shows the preciseness, practicability and convenience of the model.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2007年第4期586-591,共6页
Journal of Shanghai Jiaotong University
基金
国家自然科学基金资助项目(50571060)