用于描述奥氏体/马氏体界面的修正模型  

A MODIFIED MODEL USED TO DESCRIBE AUSTENITE/MARTENSITE INTERFACE

作　　者：程宁[1] 郭正洪[1] 孟庆平[1] 

机构地区：[1]上海交通大学材料科学与工程学院,上海200240

出　　处：《金属学报》2010年第4期418-422,共5页Acta Metallurgica Sinica

基　　金：国家自然科学基金项目50471014和U0774011资助~~

摘　　要：在择优态存在的前提下,以修正Landau多项式描述奥氏体/马氏体的界面特征.以母相弹性模量、择优态能量和马氏体相变驱动力为参数,利用Ginzburg-Landau理论计算了奥氏体/马氏体的界面结构及相关性质.结果表明,奥氏体/马氏体界面存在一个序参量变化缓慢的平台,这个平台对应于点阵结构既非奥氏体也非马氏体的过渡区域.通过对奥氏体/马氏体界面宽度和界面能的计算,表明本模型可很好地解释一些实验中观察到的现象.A modified Landau polynomial was proposed to describe the structure features of austenite/martensite interface under the existence of an interfacial preferred state.When the elastic modulus of austenite,the energy of preferred state and the driving force for martensitic transformation were selected as the variables,a transitional platform with a slow change in order parameter,i.e.scaled shear strain whose structure is neither austenite nor martensite,was found using Ginzburg-Landau theory.The energy and width of austenite/martensite interface were calculated.Based on these calculated results,some experimental phenomena during martensitic transformation can be explained perfectly.It is demonstrated that the current model is more universal.

关 键 词：马氏体 Landau理论 界面 

分 类 号：O731[理学—晶体学]