On the thermodynamics and kinetics of electropulsing induced dissolution of β-Mg17Al12 phase in an aged Mg-9Al-1Zn alloy

被引：229
作者：
Jiang, Yanbin [1 ,2 ]
Tang, Guoyi [1 ]
Shek, Chanhung [2 ]
Zhu, Yaohua [3 ]
Xu, Zhuohui [1 ]
机构：
[1] Tsinghua Univ, Grad Sch Shenzhen, Adv Mat Inst, Shenzhen 518055, Peoples R China
[2] City Univ Hong Kong, Dept Phys & Mat Sci, Kowloon Tong, Hong Kong, Peoples R China
[3] Hong Kong Polytech Univ, Dept Ind & Syst Engn, Kowloon, Hong Kong, Peoples R China
来源：
ACTA MATERIALIA | 2009年 / 57卷 / 16期
基金：
中国国家自然科学基金;
关键词：
Magnesium alloys; Phase transformation kinetics; Electropulsing treatment; ELECTRIC-CURRENT PULSES; VARIABLE-TEMPERATURE; RECRYSTALLIZATION; DIFFUSION; BEHAVIOR; COPPER; ELECTROMIGRATION; TRANSFORMATIONS; SOLIDIFICATION; STEEL;
D O I：
10.1016/j.actamat.2009.06.044
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Electropulsing induced dissolution Of beta-Mg17Al12 phase was investigated using scanning electron microscopy, X-ray diffraction and hardness tests. It was found that compared with conventional heat treatment, electropulsing treatment (EPT) decreased the apparent solid solution temperature of the beta phase and accelerated the dissolution of beta phase into alpha-matrix in a very short time of several seconds due to reduction of the nucleation thermodynamic barrier and enhancement of atomic diffusion, respectively. A model for the temperature field of a strip under EPT was established. Based on the contributions of the coupling of the thermal and athermal effects with the free energy and the direct electron-atom interactions, the thermodynamics and kinetics of the electropulsing induced dissolution of beta-Mg17Al12 are discussed. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：4797 / 4808
页数：12
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