用包含弹性应变能的微观相场法研究L12-Ni3Al相和D022-Ni3V相在1000 K,1200 K单温度时效及1000 K和1200 K交变温度下时效的原子占位.研究表明:从1000 K单温度时效经由交变温度时效至1200 K单温度时效过程中,L12相中的正位原子NiNi和AlAl及D022相中的正位原子NiNi和VV的占位几率随时间延长而下降,两种结构中的反位缺陷NiAl,NiV,VNi和AlNi及替代缺陷AlNi,AlV和VNi的占位几率却随时间延长而上升.平衡时的L12相中的NiNi占位几率大于D022相中的NiNi,L12相中的AlAl占位几率小于D022相中的VV,反位缺陷和替代原子在L12相中的占位几率均大于D022相.在交变时效下,原子占位几率的时间演化曲线呈"长城"状,曲线顶点的占位几率值小于相应的单温度时效下的平衡值,但是曲线谷值大于相应的单温度时效下的平衡值.
The microelasticity phase field model was used to study the occupancy probability (OP) of L12-Ni3 Al and D022-Ni3 V phase which suffered the 1000 K and 1200 K single temperature ageing process (1000 K STAP,1200 K STAP),1000 K and 1200 K cyclic temperature ageing process (CTAP),respectively.During the transformation of ageing processes from 1000 K STAP via CTAP to 1200 K STAP the OP of regular atoms NiNi and AlAl in L12 phase together with NiNi and VV in D022 phase decrease with time,but the antisite defect NiAl,NiV,VNi,and AlNi together with the substitutional defects AlNi,AlV,and VNi increase with time.The OP of NiNi in L12 is higher than NiNi in D022,but AlAl is lower than VV ,additionally,the OPs of defect in L12 are generally greater than that of D022.The temporal evolution curves of CTAP are "great wall" like and the peek values are lower than the relevant higher values of the other two but trough values higher than the relevant lower ones.
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