金属热处理 ›› 2023, Vol. 48 ›› Issue (12): 105-109.DOI: 10.13251/j.issn.0254-6051.2023.12.017

• 工艺研究 • 上一篇    下一篇

7B50铝合金的均匀化退火及固溶工艺

刘翠玲1, 陈思羽2, 孙红梅1   

  1. 1.济南电子机械工程学校 机电科, 山东 济南 250101;
    2.山东科技大学 材料科学与工程学院, 山东 青岛 266590
  • 收稿日期:2023-07-24 修回日期:2023-10-07 出版日期:2023-12-25 发布日期:2024-01-29
  • 通讯作者: 孙红梅,高级讲师,E-mail:393797068@qq.com
  • 作者简介:刘翠玲(1976—),女,讲师,主要研究方向为铝合金材料成分设计、制备加工、热处理工艺、教学等,E-mail:942546841@qq.com。
  • 基金资助:
    国家重点研发计划(2020YFB0311202);烟台市校地融合发展项目(2020XDRHXMXK08)

Homogenization annealing and solution treatment of 7B50 aluminum alloy

Liu Cuiling1, Chen Siyu2, Sun Hongmei1   

  1. 1. Mechatronic Department, Jinan Electronic and Mechanical Engineering School, Jinan Shandong 250101, China;
    2. School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao Shandong 266590, China
  • Received:2023-07-24 Revised:2023-10-07 Online:2023-12-25 Published:2024-01-29

摘要: 在实验室中制备了含微合金化元素Zr的7B50铝合金,对其进行了均匀化退火和固溶处理。通过金相显微镜、差热分析仪、X射线衍射分析仪、电子万能试验机、扫描电镜和透射电镜对合金低熔点相、微观组织、力学性能、断口形貌等进行了分析。研究发现,铸态合金中存在非平衡凝固相Mg(Al,Cu,Zn)2,采用420 ℃×3 h+475 ℃×21 h双级均匀化退火工艺效果最佳,既能消除非平衡凝固相,又能析出球状的Al3Zr粒子;单级固溶工艺为480 ℃保温30 min时,综合力学性能最佳,抗拉强度为574 MPa,屈服强度为535 MPa,伸长率达到13.3%。

关键词: 7B50铝合金, 均匀化退火, 固溶处理, 力学性能

Abstract: 7B50 aluminum alloy containing microalloying element Zr was prepared in the laboratory and subjected to homogenization annealing and solution treatment. The low melting point phase, microstructure, mechanical properties and fracture morphology of the alloy were analyzed using metallographic microscopy, differential thermal analysis, X-ray diffraction analysis, electronic universal testing machine, scanning electron microscopy and transmission electron microscopy. The results show that the non-equilibrium solidification phase Mg(Al, Cu, Zn)2 in the cast alloy can be eliminated by two-stage homogenization annealing at 420 ℃ for 3 h and 475 ℃ for 21 h, meantime the spherical Al3Zr particles precipitated; thus, obtaining the best effect. The single stage solution treatment process is 480 ℃ insulation for 30 min to achieve the best comprehensive mechanical properties, with tensile strength of 574 MPa, yield strength of 535 MPa, and elongation of 13.3%.

Key words: 7B50 aluminum alloy, homogenizing annealing, solution treatment, mechanical properties

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