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稀土对时效-回归-再时效处理的Al-Zn-Mg合金硬度和氢脆的影响

徐跃1, 于文学2, 郑伟涛2, 赵竹第2   

  1. 1. 吉林大学测试科学实验中心, 长春 130023; 2. 吉林大学材料科学与工程学院材料科学系, 长春 130012
  • 收稿日期:2004-02-17 修回日期:1900-01-01 出版日期:2004-10-26 发布日期:2004-10-26
  • 通讯作者: 赵竹第

Effects of rare earths on hardness and hydrogen embrittlement of an aged-retrogressed-reaged Al-Zn-Mg alloy

XU Yue1, YU Wen-xue2, ZHENG Wei-tao2, ZHAO Zhu- di2   

  1. 1. Test Science Experiment Center, Jilin University, Changchun 130023, China;2.Department of Materials Science, College of Materials Science and Engineering, Jilin University 130012, China
  • Received:2004-02-17 Revised:1900-01-01 Online:2004-10-26 Published:2004-10-26
  • Contact: ZHAO Zhu- di

摘要: 将少量稀土元素添加到Al-Zn-Mg合金中进行时效-回 归-再时效处理.利用扫描电子显微镜和X射线衍射对该合金的显微结构和沉淀相进行了观察和研究. 结果表明, 经过时效-回归-再时效处理后, 稀土Al-Zn-Mg合金的晶粒尺寸减小, 沉淀相MgZn2增加, 同时, 峰时效硬度和氢脆阻力增强.

关键词: 稀土, Al-Zn-Mg合金, 时效-回归-再时效, 硬度和氢脆

Abstract: The effects of a small amount of rare earth (RE) elements added on the hardness and hydrogen embrittlement of an aged and retrogressed-reaging Al-Zn-Mg alloy were investigated. Scanning electron microscopy and X-ray diffraction were employed to study the microstructure and the precipitation phase of the alloy. The addition of REimproves the precipitation of a streng thing phase (MgZn2) and decreases the grain size. By the addition of RE, the strength, hardness and elongation of the alloy at peak-aging can be improved, the hardness and hydrogen embrittlement resistance of the alloy after aged-retrog ressed-reaged can be enhanced.

Key words: rare earths, Al-Zn-Mg alloy, aging-retrogression-re aging, hardness and hydrogen embrittlement

中图分类号: 

  • TG155.23