| 亚晶界对Al-Zn-Mg-Cu合金淬火过程的影响 |
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| 引用本文： | 姜柯达,陈龙,张云崖,邓运来.亚晶界对Al-Zn-Mg-Cu合金淬火过程的影响[J].中国有色金属学会会刊,2014,24(7):2117-2121. |
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| 作者姓名： | 姜柯达 陈龙 张云崖 邓运来 |
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| 作者单位： | 中南大学材料科学与工程学院;中南大学高性能复杂制造国家重点实验室; |
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| 基金项目： | Projects(2010CB731700,2012CB619500)supported by the National Basic Research Program of China;Project(51375503)supported by the National Natural Science Foundation of China |
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| 摘 要： | 通过末端淬火试验研究了亚晶界对Al-7．01Zn-1．26Mg-1．43Cu合金淬火过程中的淬透性和第二相析出行为的影响。两组试样分别在440℃和480℃温度下固溶处理，以获得不同的再结晶分数。结果表明，亚晶界能够增大合金最大硬度值，但会明显降低淬透层深度。由于亚晶界的增加而引起的表面能的变化降低了相变激活能，故能够促进η’相的形成及向η相的转变。
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| 关 键 词： | Al-Zn-Mg-Cu合金 再结晶 晶界 析出相 淬火 |
| 收稿时间： | 17 October 2013 |
Influence of sub-grain boundaries on quenching process of an Al-Zn-Mg-Cu alloy |
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| Ke-da JIANG,Long CHEN,Yun-ya ZHANG,Yun-lai DENG.Influence of sub-grain boundaries on quenching process of an Al-Zn-Mg-Cu alloy[J].Transactions of Nonferrous Metals Society of China,2014,24(7):2117-2121. |
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| Authors: | Ke-da JIANG Long CHEN Yun-ya ZHANG Yun-lai DENG |
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| Affiliation: | Ke-da JIANG, Long CHEN, Yun-ya ZHANG, Yun-lai DENG( 1. School of Materials Science and Engineering, Central South University, Changsha 410083, China; 2. State Key Laboratory of High-performance Complex Manufacturing, Central South University, Changsha 410083, China) |
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| Abstract: | The effects of sub-grain boundaries on the quenching sensitivity and the precipitation behavior in Al-7.01Zn-1.26Mg- 1.43Cu alloy were investigated by an end-quenching test. Specimens were solution treated at 440 ℃ and 480 ℃ to get different recrystallization fractions, respectively. The results show that the maximum hardness value of the Al-Zn-Mg-Cu alloy can be improved by the sub-grain boundaries, but the depth of age-hardening layer decreases significantly. The precipitation temperature and the activation energy are reduced by the changes of surface energy, which is induced by sub-grain boundaries. So, the precipitation process from η phase to η phase becomes much easier. In this way, an increase in the number of sub-grain boundaries promotes the precipitation of MgZn2 particles, especially η＇-MgZn2. |
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| Keywords: | Al-Zn-Mg-Cu alloy recrystallization grain boundary precipitation quenching |
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