Ni-Cr-Al合金中间处理过程的微观相场模拟  

Microscopic Phase-Field Simulation for Ni-Cr-Al Alloy during Middle Heat Treatment

作　　者：褚忠[1] 陈铮[1] 王永欣[1] 徐华勇[2] 卢艳丽[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072 [2]青岛理工大学机械学院,山东青岛266033

出　　处：《稀有金属材料与工程》2006年第9期1461-1465,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50071046)资助

摘　　要：基于微观相场模型,模拟研究中间处理+时效处理(1273K+1073K)工艺对Ni-15.5%Al-10.5%Cr(原子分数,下同)合金沉淀机制和有序相体积分数的影响。研究发现:经过中间处理,合金沉淀机制为非经典形核长大;而单级时效时,沉淀机制为等成分有序化+失稳分解混合机制。中间处理可得到尺寸较大的沉淀强化相γ′相,有序相体积分数和平均长程序参数有所提高,孕育期比单级时效延长。The effect of the middle heat treatment＋aging （1273 K＋1083 K） for the precipitation mechanism and volume fraction of Ni-Cr-Al ternary alloy have been studied based on microscopic phase-field model. The results show that the precipitation mechanism is non-classical nucleation and growth for the alloy at middle heat treatment, and the congruent ordering and spinodal decomposition mechanism occur at single-stage aging. The larger precipitation strengthening phases γ＇ were obtained, the volume fraction of ordering phases and the averaged ordering parameter were higher, and the incubation period was prolonged after the middle heat treatment.

关 键 词：微观相场模型 NI-CR-AL 中间处理 体积分数 模拟 

分 类 号：TG111[金属学及工艺—物理冶金]