Effect of Quenching Rate on Microstructure and Hardness of Al-Zn-Mg-Cu-Cr Alloy Extruded Bar

被引：1
作者：
Han S.-Q. [1 ,2 ,3 ]
Liu S.-D. [1 ,2 ,3 ]
Li C.-B. [1 ,2 ,3 ]
Lei Y. [1 ,2 ,3 ]
Deng Y.-L. [1 ,2 ,3 ]
Zhang X.-M. [1 ,2 ,3 ]
机构：
[1] School of Materials Science and Engineering, Central South University, Changsha
[2] Key Laboratory of Nonferrous Metal Materials Science and Engineering(Ministry of Education), Central South University, Changsha
[3] Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation Center, Central South University, Changsha
来源：
Liu, Sheng-Dan (lsd_csu@csu.edu.cn) | 1600年 / Beijing Institute of Aeronautical Materials (BIAM)卷 / 45期
关键词：
Al-Zn-Mg-Cu-Cr alloy; Hardness; Microstructure; Quenching rate;
D O I：
10.11868/j.issn.1001-4381.2015.000502
中图分类号：
学科分类号：
摘要：
The effect of quenching rate on microstructure and hardness of Al-Zn-Mg-Cu-Cr alloy extruded bar was studied by hardness test, scanning electron microscopy and transmission electron microscopy. The results show that at quenching rate below 100℃/s, during the cooling process, the hardness begins to fall significantly; and it decreases by 43% at the quenching rate of 2℃/s. At quenching rate below 100℃/s, the number and size of equilibrium η phase heterogeneously nucleated at(sub)grain boundaries and on dispersoids inside grains increase obviously with the decrease of quenching rate, leading to greatly reduced age-hardening response. At the same quenching rate, the equilibrium η phase inside grains is larger than that at grain boundaries. In the range of the studied quenching rates, a quantitative relationship between hardness and equilibrium η phase area fraction has been established. © 2017, Journal of Materials Engineering. All right reserved.
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页码：9 / 14
页数：5
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