Exothermic reaction in eutectoid Zn-Al based alloys

被引：28
作者：
Zhu, YH [1 ]
Man, HC
Lee, WB
机构：
[1] Univ Nacl Autonoma Mexico, Inst Invest Mat, Apart P 70-360, Mexico City 04510, DF, Mexico
[2] Hong Kong Polytech Univ, Dept Mfg Engn, Hong Kong, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1999年 / 268卷 / 1-2期
关键词：
Zn-Al alloys; exothermic reaction; scanning electron microscopy;
D O I：
10.1016/S0921-5093(99)00072-6
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Both solution treated and quench-aged eutectoid Zn-Al based alloys (ZnAl20Cu3Si2 and ZnAl22Cu2 in wt.%) were studied by differential scanning calorimeter (DSC), X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. An exothermic phenomenon was observed at the early stage of ageing. Similar behavior was also found for the cast eutectoid Zn-Al alloy. The activation energy for the exothermic phenomenon was calculated, which was in a good agreement with that derived from X-ray diffraction examination for the decomposition of the supersaturated beta'(s) phase in the eutectoid Zn-Al based alloy. It is concluded that the decomposition of the beta'(s) phase is an exothermic solid state reaction in the eutectoid Zn-Al based alloys. (C) 1999 Published by Elsevier Science S.A. All rights reserved.
引用
收藏
页码：147 / 153
页数：7
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