张静,陈铮,杨坤,卢艳丽,王永欣

• 1:西北工业大学凝固国家重点实验室
• 2:材料科学与工程学院

摘要(Abstract)：

用包含弹性应变能的微观相场法研究L12-Ni3Al相和D022-Ni3V相在1000K,1200K单温度时效及1000K和1200K交变温度下时效的原子占位。研究表明:从1000K单温度时效经由交变温度时效至1200K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。

关键词(KeyWords)： 原子占位几率;反位缺陷;替代缺陷;微观相场

Abstract:

Keywords:

基金项目(Foundation): National Natural Science Foundations of China(Grant Nos:50875217,10902086)

作者(Author): 张静,陈铮,杨坤,卢艳丽,王永欣

DOI: 10.13289/j.issn.1009-6264.2010.09.004

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