包含共格畸变的立方合金沉淀机制的计算机模拟  

Computer Simulation for the Precipitation Mechanism of the Cubic Alloy Including Coherent Strain Energy

作　　者：卢艳丽[1] 陈铮[1] 李永胜[1] 王永欣[1] 褚忠[1] 

机构地区：[1]西北工业大学,陕西西安710072

出　　处：《稀有金属材料与工程》2005年第8期1205-1208,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金资助项目(50071046);国家863资助项目(2002AA331051)

摘　　要：利用包含共格畸变能的微观扩散方程对立方合金的沉淀过程进行计算机模拟。结果表明:共格畸变阻碍了过渡区合金沉淀过程的进行,随共格畸变能的增大,沉淀相分布的取向性越来越明显,由原来离散分布的等轴粒子状向椭片状转变。靠近高浓度合金的过渡区合金,随共格畸变能的增大,其沉淀机制由非经典形核长大和失稳分解的混合特征逐渐向非经典形核长大型的沉淀特征转变。The precipitation process simulation of the medial density cubic alloy was conducted using the microscopic diffusion equation including the coherent strain energy, The results show that the coherent strain energy hinder the precipitation process of the alloy. With the increase of coherent strain energy, the arrangement orientation increase, from spherical-shaped precipitates to elliptical plate. With the increase of coherent strain energy, the precipitation mechanism of medial composition alloys near the high density alloys are changing from the mixture processes which possessed the characteristics of both non-classical nucleation growth and spinodal decomposition mechanisms to the processes which possessed only the characteristics of non-classical nucleation growth.

关 键 词：微扩散方程 共格畸变 立方合金 计算机模拟 

分 类 号：TG132.32[一般工业技术—材料科学与工程]