摘要
利用微观相场动力学模型,模拟研究温度对Ni-12at%Cr-14.5at%Al合金沉淀过程中Cr原子的替代规律。在873～1173K范围内,随着温度的提高,合金沉淀机制由等成分有序化+失稳分解转化为非经典形核机制,沉淀孕育期逐渐延长;L12相体积分数增加,而D022相体积分数减少,在1173K时,D022相消失,最终形成单一的L12相。
The simulations of the influence of temperature on Cr atom substitution character in Ni-Cr-Al alloy were performed based on microscopic phase-field model.It is found that nonstoicheometric ordering L12 phases appear first with congruent ordering＋spinodal decomposition mechanism,then followed by non-classical nucleation and growth mechanism with the rising of aging temperature,and the incubation period increases gradually at 873～1173 K.The volume fraction of L12 phases increases and that of D022 phases decreases.D022 phases disappear and only L12 phases are remained at 1173 K.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2012年第11期2021-2024,共4页
Rare Metal Materials and Engineering
