摘要
利用微观相场动力学模型模拟研究873K时Ni75CrxAl25-x合金中Cr原子的替代规律。在合金沉淀过程中,Cr原子部分替代Al原子格点形成L12结构的γ'相(Ni3Al1-xCrx)。Cr原子在L12相内的占位几率极限值较小,当Cr含量超过3%时,L12相内Cr原子的浓度接近饱和值。在L12相的有序畴界处,Cr原子完全取代Al原子位置,形成稳定的Ni3Cr相(D022结构)。该合金最终沉淀产物为Ni3Al-Ni3Cr混合相。
The substitution behavior of Cr atom in Ni75CrxAl25-x alloy at 873 K was simulated by a microscopic phase-field model.During the precipitation progress,Cr atoms substitute for the Al sublattices partially to form Ni3Al1-xCrx phases（L12 structure）.The limits of occupation probabilities of Cr atoms in L12 phases are lower.Cr atom concentration approaches the saturation value in L12 phases when Cr content exceeds 3%.At the ordering domain interface of L12 phases,Cr atoms substitute for the Al sublattices completely,and the stable D022 phases are formed.The final precipitates are mix phases of Ni3Al-Ni3Cr.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2011年第2期259-264,共6页
Rare Metal Materials and Engineering
