金属热处理 ›› 2021, Vol. 46 ›› Issue (6): 53-58.DOI: 10.13251/j.issn.0254-6051.2021.06.011

• 工艺研究 • 上一篇    下一篇

固溶处理对Al-8.8Zn-2.0Mg-2.1Cu-0.1Zr-0.1Ce合金组织性能的影响

李彩琼, 孔德斌, 余鑫祥   

  1. 烟台南山学院 工学院, 山东 烟台 265713
  • 收稿日期:2021-01-09 出版日期:2021-06-25 发布日期:2021-07-21
  • 通讯作者: 孔德斌,副教授,硕士,E-mail:kongdebin1981@ qq.com
  • 作者简介:李彩琼(1987—),女,讲师,硕士,主要研究方向为材料计算与微观组织,E-mail:licaiqiong666@163.com。
  • 基金资助:
    烟台市校地融合发展项目平台建设类(2020XDRHXMPT18);龙口市科技研发计划(2019KJJH021);2020年烟台南山学院青年基金(Q202015)

Effect of solution treatment on microstructure and properties of Al-8.8Zn-2.0Mg-2.1Cu-0.1Zr-0.1Ce alloy

Li Caiqiong, Kong Debin, Yu Xinxiang   

  1. College of Engineering, Yantai Nanshan University, Yantai Shandong 265713, China
  • Received:2021-01-09 Online:2021-06-25 Published:2021-07-21

摘要: 采用拉伸性能和导电率测试、光学显微镜(OM)、扫描电镜(SEM)、差热分析(DSC)、透射电镜(TEM)研究了固溶温度和时间对Al-8.8Zn-2.0Mg-2.1Cu-0.1Zr-0.1Ce合金板材微观组织、拉伸性能及断口形貌的影响。结果表明,试验合金适宜的固溶工艺为470 ℃×60 min,使冷轧态金属间化合物充分固溶。在此工艺下合金时效后的抗拉强度、屈服强度(以Rp0.2计)以及伸长率分别为646 MPa、581 MPa和14.5%。TEM观察发现合金板材固溶时效后晶内强化相η′仅为2~5 nm,并且晶界析出相η呈现断续分布。此外,合金拉伸断面韧窝中大量弥散分布的AlCuCeZn粒子有利于合金塑性的明显提升。

关键词: Al-Zn-Mg-Cu合金, 固溶处理, 微观组织, 拉伸性能

Abstract: Effects of solution treatment temperature and time on microstructure, tensile properties and fracture morphology of Al-8.8Zn-2.0Mg-2.1Cu-0.1Zr-0.1Ce alloy sheet were studied by using tensile test, conductivity test, optical micrography (OM), scanning electron microscopy (SEM), differential thermal analysis (DSC) and transmission electron microscopy (TEM). The results show that the suitable solution treatment process for the alloy is 470 ℃×60 min, which makes the intermetallic compounds in cold rolled alloy fully solved, and the tensile strength (Rm), yield strength (Rp0.2) and elongation (A) of the alloy after aging are 646 MPa, 581 MPa and 14.5%, respectively. The TEM observation shows that the intragranular strengthening phase η′ is only 2-5 nm and the grain boundary phase η distributes discontinuously after solution and aging treatment. In addition, a large number of AlCuCeZn particles dispersed in the tensile fracture dimples are beneficial to the improvement of the ductility of the alloy.

Key words: Al-Zn-Mg-Cu alloy, solution treatment, microstructure, tensile properties

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