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.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
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
