Effect of minor Er and Y additions to Al-Zn-Mg-Cu-Zr alloy on homogenizing behavior

被引：0
|
作者：
Li G.-F. [1 ]
Zhang X.-M. [1 ]
Zhu H.-F. [1 ]
机构：
[1] School of Material Science and Engineering, Key Laboratory of Non-Ferrous Metal Material Science and Engineering of the Ministry of Education, Central South University
来源：
Hangkong Cailiao Xuebao/Journal of Aeronautical Materials | 2010年 / 30卷 / 06期
关键词：
Al-Zn-Mg-Cu-Zr alloy; As-cast microstructures; Homogenization; Microalloying with Er; Y elements;
D O I：
10.3969/j.issn.1005-5053.2010.6.001
中图分类号：
学科分类号：
摘要：
Effect of minor Er and Y addition to Al-Zn-Mg-Cu-Zr alloy on the homogenizing behavior were studied by means of optical microscope (OM), different temperature analysis(DTA), scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray diffraction (XRD). The results indicate that when microalloying with minor Er and Y addition(gross < 0.4%) to Al-Zn-Mg-Cu-Zr alloy, the dissolution temperature of the pseudo eutectic of the alloy rises, and the homogenizing temperature rises accordingly. After two-step homogenizing process, there is a few of the rudimental eutectic compounds for Al2CuMg and Al8Cu4Er phase in the alloy. The Al2CuMg phase dissolves after three-step homogenizing process, but the dissolution of the Al8Cu4Er phase is more difficult. After the three-step homogenizing process (annealing 465°C/24h+475°C/4h+485°C/4h), the rudimental eutectic compound is little, and a large number of the fine particles of the second phase are uniformly precipitated in the matrix, which is advantageous to restraining recrystallization of the alloy and raising the mechanical properties of the alloy.
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页码：1 / 6
页数：5
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