Influence of Fe and Si impurities on the quench sensitivity of Al-Zn-Mg-Cu alloy

被引：0
作者：
机构：
[1] School of Materials Science and Engineering, Central South University
[2] Key Laboratory of Nonferrous Materials Science and Engineering (Ministry of Education), Central South University
来源：
Zhang, X.-M. (xmzhang_cn@yahoo.cn) | 1600年 / Beijing Institute of Aeronautical Materials (BIAM)卷
关键词：
Al-Zn-Mg-Cu alloy; End-quenching test; Fe and Si impurity; Quench sensitivity;
D O I：
10.3969/j.issn.1001-4381.2013.10.007
中图分类号：
学科分类号：
摘要：
The influence of Fe and Si impurities was investigated quenching by means of end-quenching tests, and microstructure analysis including optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Results show that the addition of Fe and Si impurities leads to lower quench sensitivity, decreasing by 3.29% in maximum when characterize by hardness. With increasing the content of Fe and Si impurities, Al7Cu2Fe phase and Mg2Si phase content increased significantly, thus reducing the solutes concentration of Cu and Mg elements in the matrix, reducing the degree of supersaturation, which leads to lower quench sensitivity. Al7Cu2Fe phases and Mg2Si phases are favorable for recrystallization, but bad for the reducing quench sensitivity. This is attributed to the higher amount of the recrystallization grains and (sub)grain boundaries, which result in more heterogeneous precipitation of η equilibrium phases during slow quenching. The influence of supersaturation on quench sensitivity is bigger than that of grain structures.
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页码：41 / 47
页数：6
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