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Mg-Zn合金时效过程的热力学分析

发表时间:2009-11-30  浏览量:1404  下载量:688
全部作者: 李秀梅,李长荣,杜振民,郭翠萍
作者单位: 北京科技大学材料科学与工程学院
摘 要: 采用CALPHAD技术,对Mg-Zn体系的Mg基固溶体相的热力学特征参数进行合理的优化评估,从而体现出Mg基过饱和固溶体存在亚稳态溶解度间隙和溶质原子偏聚(GP)区的热力学特征。在此基础上,结合溶解度间隙和Spinodal分解曲线,确定了具有GP区析出效应的Mg-Zn体系的合金成分范围、时效温度区间以及GP区溶质原子的偏聚浓度。同时,考虑界面能和驱动力的协同影响,综合给出Mg基固溶体在时效过程中的脱溶序列为:过饱和固溶体α→GP→β″1(MgZn2)→β″2(MgZn2)→β′(Mg2Zn3)→β(MgZn), 与实验报道结果相一致。
关 键 词: 材料科学基础学科;Mg-Zn合金;时效过程;脱溶分解;热力学分析
Title: Thermodynamic analysis on ageing process of Mg-Zn alloys
Author: LI Xiumei, LI Changrong, DU Zhenmin, GUO Cuiping
Organization: School of Materials Science and Engineering, University of Science and Technology Beijing
Abstract: This paper is studied the Mg-Zn binary system. Firstly, the Gibbs free energy description of the Mg-based solid solution was typically re-optimized with the help of the Thermo-Calc software package. The obtained thermodynamic parameters could well represent the thermodynamic characteristics of the existence of the metastable miscibility gaps and the atomic clustering GP zones in the Mg-based solid solutions. Secondly, to guarantee the age hardening effect, considering both miscibility gaps and Spinodal decomposition curves, the required alloy composition range and the related ageing temperature were obtained, and the atomic clustering compositions of GP zones were predicted. Finally, with consideration of both the interfacial energies and the driving force analysis, the precipitation sequence during ageing process was obtained as the following: Supersaturated solid solution α→GP→β″1(MgZn2)→β″2(MgZn2)→β′(Mg2Zn3)→β(MgZn). The theoretical analysis was well consistent with the reported experimental results.
Key words: foundational discipline in materials science; Mg-Zn alloy; ageing process; precipitation decomposition; thermodynamic analysis
发表期数: 2009年11月第22期
引用格式: 李秀梅,李长荣,杜振民,等. Mg-Zn合金时效过程的热力学分析[J]. 中国科技论文在线精品论文,2009,2(22):2364-2372.
 
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