刘珂,胡丽娟,冯炫凯,张巧凤,高超,董海英,梁婉怡,谢耀平

• 1:上海大学材料研究所
• 2:上海大学微结构重点实验室
• 3:中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室

摘要(Abstract)：

利用分子动力学方法研究了Fe-1.24%Cu-0.62%Ni合金经773 K时效不同时间拉伸性能的变化。通过模拟时效前后Fe-1.24%Cu-0.62%Ni合金的单轴拉伸过程,得到对应的应力-应变曲线,结合共同近邻分析,得到了富铜团簇对Fe-1.24%Cu-0.62%Ni合金拉伸性能的影响。结果表明:在单轴拉伸过程中,滑移带首先在富Cu团簇聚集区域产生,并且诱发了体心立方结构向面心立方或密排六方结构(BCC→FCC/HCP)的转变,从而导致Fe-1.24%Cu-0.62%Ni合金断裂。此外,在时效过程中随着富铜团簇的增大,Fe-1.24%Cu-0.62%Ni合金的屈服强度降低。

关键词(KeyWords)： 分子动力学;Fe-1.24%Cu-0.62%Ni合金;富Cu团簇;应力-应变;结构转变

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51301102);; 上海市自然科学基金(15ZR1416000)

作者(Author): 刘珂,胡丽娟,冯炫凯,张巧凤,高超,董海英,梁婉怡,谢耀平

DOI: 10.13289/j.issn.1009-6264.2017-0102

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