Fe-Cr合金α'相分解及其粗化动力学的相场研究  

Phase-field Simulation for Separation and Coarsening Kinetics of Cr-enriched α' Phase in Fe-Cr alloys

作　　者：刘苇[1] 李永胜[1] 胡凯[1] 梅浩杰[1] 

机构地区：[1]南京理工大学材料科学与工程学院,江苏南京210094

出　　处：《机械制造与自动化》2017年第4期22-26,共5页Machine Building & Automation

摘　　要：通过建立Fe-Cr合金相分解的相场动力学模型,模拟了610 K时效温度下,初始Cr浓度分别为c_(Cr)=0.25、c_(Cr)=0.28和cCr=0.35(at.%)的合金中α'相的分解过程及动力学行为,得到该温度下富Cr的α'相微观组织演变图像。对α'相成分随时间变化的分析表明,该温度下的3种浓度的合金相分解机制均为失稳分解。对失稳分解的Fe-Cr合金而言,相同温度下α'相分解和粗化动力学随着初始Cr浓度增加而增大。The phase separation in Fe-Cr alloys is studied by phase field model.The separation of Cr-enriched α＇ phase via the spinodal decomposition is detected in the alloys aged at 610 K with initial composition cCr=25,28 and 35（at.%）,respectively.The temporal Cr composition profiles variation indicates that the phase separation at 610 K is spinodal decomposition.Besides,for the spinodal Fe-Cr alloys,the separation and coarsening kinetics of the Cr-enriched α＇ phase are accelerated with the increasing of initial Cr composition at the same temperature.

关 键 词：FE-CR合金 失稳分解 动力学 相场 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]