金属热处理 ›› 2023, Vol. 48 ›› Issue (4): 53-59.DOI: 10.13251/j.issn.0254-6051.2023.04.009

• 工艺研究 • 上一篇    下一篇

固溶处理对TiB2/7050Al复合材料组织与性能的影响

杨苗1, 林茂2, 孙福德2, 刘钧1, 陈哲1, 王浩伟1   

  1. 1.上海交通大学 材料科学与工程学院, 上海 200240;
    2.西北铝业有限责任公司, 甘肃 陇西 748111
  • 收稿日期:2022-10-08 修回日期:2023-01-12 发布日期:2023-05-27
  • 通讯作者: 刘 钧,助理研究员,博士,E-mail:mseliujun@sjtu.edu.cn
  • 作者简介:杨 苗(1995—),女,学士,主要研究方向为铝合金及其复合材料的热处理强化,E-mail:miao.yang@sjtu.edu.cn。
  • 基金资助:
    国家自然科学基金(52101179,51971137)

Effect of solution treatment on microstructure and properties of    TiB2/7050Al composite

Yang Miao1, Lin Mao2, Sun Fude2, Liu Jun1, Chen Zhe1, Wang Haowei1   

  1. 1. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
    2. Northwest Aluminium Corporation Limited, Longxi Gansu 748111, China
  • Received:2022-10-08 Revised:2023-01-12 Published:2023-05-27

摘要: 研究了固溶处理对TiB2/7050Al复合材料组织与性能的影响规律。结果表明,TiB2/7050Al复合材料内的可溶性第二相主要为MgZn2(η相)、AlZnMgCu(T相)和Al2CuMg(S相)。η相在470 ℃已完全溶解,T相在476 ℃开始溶解,S相在491 ℃下可完全溶解。随固溶温度的升高,复合材料的强度整体呈上升趋势,但伸长率先增加后降低。在480 ℃固溶时,复合材料同时具备高强度和高塑性,其屈服强度、抗拉强度和伸长率分别为658 MPa、719 MPa和11.3%;继续升高固溶温度至490 ℃,虽然可使铝基体内残余S相完全溶解,但也使基体再结晶晶粒异常长大,降低了复合材料的塑性。

关键词: TiB2/7050Al复合材料, 固溶处理, 微观组织, 力学性能

Abstract: Effect of solution treatment on microstructure and properties of TiB2/7050Al composite was studied. The results show that the soluble phases in the TiB2/7050Al composite are mainly MgZn2(η phase), AlZnMgCu(T phase) and Al2CuMg(S phase). The η phase can dissolve completely below 470 ℃. The T phase begins to dissolve at 476 ℃, and the S phase can dissolve completely at 491 ℃. With the increase of solution treatment temperature, the strength of the composite increases, but the elongation increases firstly and then decreases. When solution treated at 480 ℃, the composite has both high strength and high plasticity, with its yield strength, tensile strength and elongation being 658 MPa, 719 MPa and 11.3%, respectively. Further increasing the solution treatment temperature to 490 ℃, though the residual S phase completely dissolves in the Al matrix, but the elevated temperature promotes the recrystallized grains to grow abnormally, inducing low plasticity of the composite.

Key words: TiB2/7050Al composite, solution treatment, microstructure, mechanical properties

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