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材料工程  2017, Vol. 45 Issue (4): 9-14    DOI: 10.11868/j.issn.1001-4381.2015.000502
  研究论文 本期目录 | 过刊浏览 | 高级检索 |
淬火速率对Al-Zn-Mg-Cu-Cr合金挤压棒材组织及硬度的影响
韩素琦1,2,3, 刘胜胆1,2,3, 李承波1,2,3, 雷越1,2,3, 邓运来1,2,3, 张新明1,2,3
1. 中南大学 材料科学与工程学院, 长沙 410083;
2. 中南大学 有色金属材料与工程教育部重点实验室, 长沙 410083;
3. 中南大学 有色金属先进结构材料与制造协同创新中心, 长沙 410083
Effect of Quenching Rate on Microstructure and Hardness of Al-Zn-Mg-Cu-Cr Alloy Extruded Bar
HAN Su-qi1,2,3, LIU Sheng-dan1,2,3, LI Cheng-bo1,2,3, LEI Yue1,2,3, DENG Yun-lai1,2,3, ZHANG Xin-ming1,2,3
1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Nonferrous Metal Materials Science and Engineering(Ministry of Education), Central South University, Changsha 410083, China;
3. Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation Center, Central South University, Changsha 410083, China
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摘要 通过硬度测试、扫描电镜、透射电镜研究淬火速率对Al-Zn-Mg-Cu-Cr合金挤压棒材组织及硬度的影响。结果表明:淬火速率低于100℃/s时,硬度开始明显下降;2℃/s淬火时,硬度下降了43%。淬火速率低于100℃/s时,随着淬火速率降低,冷却过程中(亚)晶界及晶内弥散粒子处非均匀形核析出η平衡相的数量和尺寸明显增加,时效强化效果明显降低。相同淬火速率时,晶内η平衡相尺寸大于晶界η平衡相尺寸。在所研究的淬火速率范围内建立起硬度值与η平衡相面积分数间的定量关系。
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韩素琦
刘胜胆
李承波
雷越
邓运来
张新明
关键词 Al-Zn-Mg-Cu-Cr合金淬火速率微观组织硬度    
Abstract: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.
Key wordsAl-Zn-Mg-Cu-Cr alloy    quenching rate    microstructure    hardness
收稿日期: 2015-04-27      出版日期: 2017-04-17
中图分类号:  TG146.2+1  
通讯作者: 刘胜胆(1980-),男,副教授,博士,从事高性能轻合金材料研究,联系地址:湖南省长沙市中南大学本部特冶楼(410083),E-mail:csuliusd@163.com,lsd_csu@csu.edu.cn     E-mail: csuliusd@163.com,lsd_csu@csu.edu.cn
引用本文:   
韩素琦, 刘胜胆, 李承波, 雷越, 邓运来, 张新明. 淬火速率对Al-Zn-Mg-Cu-Cr合金挤压棒材组织及硬度的影响[J]. 材料工程, 2017, 45(4): 9-14.
HAN Su-qi, LIU Sheng-dan, LI Cheng-bo, LEI Yue, DENG Yun-lai, ZHANG Xin-ming. Effect of Quenching Rate on Microstructure and Hardness of Al-Zn-Mg-Cu-Cr Alloy Extruded Bar. Journal of Materials Engineering, 2017, 45(4): 9-14.
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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2015.000502      或      http://jme.biam.ac.cn/CN/Y2017/V45/I4/9
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