华南理工大学学报(自然科学版) ›› 2015, Vol. 43 ›› Issue (11): 75-80.doi: 10.3969/j.issn.1000-565X.2015.11.011

• 材料科学与技术 • 上一篇    下一篇

轧制变形量对Al-5Zn-3Mg-1Cu合金显微组织和力学性能的影响

李东锋,张新明,刘胜胆,尹邦文,雷越   

  1. 中南大学 材料科学与工程学院,湖南 长沙 410083
  • 收稿日期:2015-05-05 修回日期:2015-07-06 出版日期:2015-11-25 发布日期:2015-10-01
  • 通信作者: 李东锋( 1979-) ,男,博士生,讲师,主要从事高强铝合金组织与性能研究 E-mail:hunan_ldf@163.com
  • 作者简介:李东锋( 1979-) ,男,博士生,讲师,主要从事高强铝合金组织与性能研究
  • 基金资助:
    国家重点基础研究计划项目(2012CB619501);国际科技合作专项项目(2013DFG51890)

Effect of Rolling Deformation on Microstructure and Mechanical of Al-5Zn-3Mg-1Cu Alloy

Li Dong-feng Zhang Xin-ming Liu Sheng-dan Yin Bang-wen Lei Yue   

  1. School of Materials Science and Engineering,Central South University,Changsha 410083,Hunan,China
  • Received:2015-05-05 Revised:2015-07-06 Online:2015-11-25 Published:2015-10-01
  • Contact: 李东锋( 1979-) ,男,博士生,讲师,主要从事高强铝合金组织与性能研究 E-mail:hunan_ldf@163.com
  • About author:李东锋( 1979-) ,男,博士生,讲师,主要从事高强铝合金组织与性能研究
  • Supported by:
    Supported by the National Program on Key Basic Research Project of China(2012CB619501) and the Program
    for International S&T Cooperation Projects of China(2013DFG51890)

摘要: 采用室温拉伸试验、Kahn 撕裂试验,结合光学显微镜、透射电子显微镜等方法,研究了 Al-5Zn-3Mg-1Cu 铝合金厚板在热轧过程中随轧制变形量增大其合金组织和力学性能的演变过程. 结果表明:热轧变形过程中,变形量从 56% 增大至 91% 时,合金的再结晶分数由 0. 49%增大至 43. 30%,晶粒尺寸从 83μm 减小至 10μm 以下,合金的抗拉强度和屈服强度分别从 542. 3 和 520. 0MPa 提升到 593. 4 和 564. 9 MPa,延伸率从 8. 0% 左右提高到 11. 2%;随轧制变形量的增大,合金撕裂强度和单位面积裂纹形核功呈增大的趋势.

关键词: 铝合金, 轧制变形, 力学性能, 拉伸试验, Kahn 撕裂试验

Abstract: Tensile test at room temperature and Kahn tear test were conducted to investigate the evolution of the microstructure and mechanical properties of Al-5Zn-3Mg-1Cu thick plate during the hot rolling by means of OM and TEM. The results show that (1) during the hot rolling of the aluminum alloy,both the deformation and the fraction of recrystallization increase respectively from 56% and 0. 49% to 91% and 43. 30%,while the grain size decreases from 83μm to below 10μm; (2) meanwhile,the tensile strength and yield strength of the aluminum alloy increase respectively from 542. 3 and 520. 0MPa to 593. 4 and 564. 9MPa,and the elongation increases from about 8. 0% to 11. 2%; and (3) as the deformation increases,the tear strength (TS) and UIE of the aluminum alloy tend to increase.

Key words: aluminum alloy, rolling deformation, mechanical properties, tensile test, Kahn tear test

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