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材料工程  2013, Vol. 0 Issue (10): 41-47    DOI: 10.3969/j.issn.1001-4381.2013.10.007
  材料与工艺 本期目录 | 过刊浏览 | 高级检索 |
Fe和Si杂质对Al-Zn-Mg-Cu合金淬火敏感性的影响
张新明1,2, 余翠娟1,2, 刘胜胆1,2, 刘星兴1,2, 张盼1,2, 王莹莹1,2
1. 中南大学 材料科学与工程学院, 长沙 410083;
2. 中南大学 有色金属材料科学与工程教育部重点实验室, 长沙 410083
Influence of Fe and Si Impurities on the Quench Sensitivity of Al-Zn-Mg-Cu Alloy
ZHANG Xin-ming1,2, YU Cui-juan1,2, LIU Sheng-dan1,2, LIU Xing-xing1,2, ZHANG Pan1,2, WANG Ying-ying1,2
1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Nonferrous Materials Science and Engineering (Ministry of Education), Central South University, Changsha 410083, China
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摘要 采用光学显微镜、扫描电子显微镜和透射电子显微镜等方法, 研究了Fe和Si杂质对Al-Zn-Mg-Cu合金淬火敏感性的影响。结果表明: 杂质含量的增加降低了合金的淬火敏感性, 用硬度表征时最大降低3.29%。随杂质Fe和Si含量的增加, Al7Cu2Fe相和Mg2Si相含量明显增加, 消耗了基体中的Cu和Mg原子, 合金的过饱和度降低, 从而引起合金淬火敏感性的降低;同时粗大的Al7Cu2Fe相和Mg2Si相有利于再结晶核心的形成, 增加了合金的再结晶晶粒和(亚)晶界数目, 促进慢速淬火过程中η平衡相的析出。过饱和度对合金淬火敏感性的影响大于晶粒结构对合金淬火敏感性的影响。
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张新明
余翠娟
刘胜胆
刘星兴
张盼
王莹莹
关键词 Fe和Si杂质Al-Zn-Mg-Cu合金末端淬火淬火敏感性    
Abstract: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.
Key wordsFe and Si impurity    Al-Zn-Mg-Cu alloy    end-quenching test    quench sensitivity
收稿日期: 2013-05-01      出版日期: 2013-10-20
中图分类号:  TG146.21  
基金资助:国家973重点基础研究发展计划资助项目(2012CB619500)
作者简介: 张新明(1946- ),男,教授,博士生导师,研究方向:有色金属材料加工工程研究,联系地址:湖南省长沙市中南大学材料科学与工程学院(410083),E-mail:xmzhang_cn@yahoo.cn
引用本文:   
张新明, 余翠娟, 刘胜胆, 刘星兴, 张盼, 王莹莹. Fe和Si杂质对Al-Zn-Mg-Cu合金淬火敏感性的影响[J]. 材料工程, 2013, 0(10): 41-47.
ZHANG Xin-ming, YU Cui-juan, LIU Sheng-dan, LIU Xing-xing, ZHANG Pan, WANG Ying-ying. Influence of Fe and Si Impurities on the Quench Sensitivity of Al-Zn-Mg-Cu Alloy. Journal of Materials Engineering, 2013, 0(10): 41-47.
链接本文:  
http://jme.biam.ac.cn/CN/10.3969/j.issn.1001-4381.2013.10.007      或      http://jme.biam.ac.cn/CN/Y2013/V0/I10/41
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