金属热处理 ›› 2022, Vol. 47 ›› Issue (8): 217-222.DOI: 10.13251/j.issn.0254-6051.2022.08.036

• 工艺研究 • 上一篇    下一篇

Cu含量及T6处理对电力金具用铝合金组织性能的影响

郑革1, 陈杰1, 牛堃宁2, 林建国2, 檀朝桂2, 戴翌龙1,2   

  1. 1.永固集团股份有限公司, 浙江 温州 325600;
    2.湘潭大学 材料科学与工程学院, 湖南 湘潭 411105
  • 收稿日期:2022-03-15 修回日期:2022-06-25 出版日期:2022-08-25 发布日期:2022-09-19
  • 通讯作者: 戴翌龙,硕士生导师,讲师,博士,E-mail:daiyilong@xtu.edu.cn
  • 作者简介:郑 革(1980—),男,学士,主要研究方向为电力金具材料及先进制造工艺产业化,E-mail:zg@yongu.com。
  • 基金资助:
    湖南省科技创新计划(2020RC2080);湖南省自然科学基金(2019JJ60006)

Effect of Cu content and T6 treatment on microstructure and properties of aluminum alloy used for electric power fittings

Zheng Ge1, Chen Jie1, Niu Kunning2, Lin Jianguo2, Tan Chaogui2, Dai Yilong1,2   

  1. 1. YONGU Group Co., Ltd., Wenzhou Zhejiang 325600, China;
    2. School of Materials Science and Engineering, Xiangtan University, Xiangtan Hunan 411105, China
  • Received:2022-03-15 Revised:2022-06-25 Online:2022-08-25 Published:2022-09-19

摘要: 探究了Cu含量与时效工艺对Al-Cu-Mg-Si系合金显微组织、力学性能以及耐腐蚀性能的影响。研究表明,随Cu含量的增加,铸态铝合金中Al2Cu相数量增加、尺寸不断增大,形貌由点状转为粗网状,铸态铝合金的强度也随之提升,耐蚀性能下降。在180 ℃×(4~28) h时效区间内,整体上合金硬度先上升后下降,0.5%Cu、1.5%Cu合金在8 h时达到峰值,2.5%Cu合金在12 h时达到峰值。530 ℃固溶+180 ℃×8 h时效后,铝合金中析出Al2Cu相,随着Cu含量的增加,Al2Cu相的含量增加,硬度显著上升,2.5%Cu含量的合金抗拉强度达到最大值325.0 MPa,屈服强度达到258.8 MPa,伸长率为4.5%,其强度与传统的电力金具用铸铁相当。

关键词: 铝合金, Cu含量, T6处理, 组织性能

Abstract: Effect of copper content and aging process on microstructure, mechanical properties and corrosion resistance of the Al-Cu-Mg-Si alloy was investigated. The results show that, with the increase of Cu content, both the quantity and size of Al2Cu phase in as-cast aluminum alloy increase, and the morphology changes from point to coarse network. The strength of the as-cast aluminum alloy also increases, but the corrosion resistance decreases. Within the aging range of 180 ℃×(4-28) h, the overall hardness of the alloy increases first and then decreases, with 0.5%Cu and 1.5%Cu alloys reaching the peak value under 8 h and 2.5%Cu alloy reaching the peak value under 12 h. The Al2Cu phase precipitates from the aluminum alloy after solution treatment at 530 ℃ and aging at 180 ℃ for 8 h, with the increase of Cu content, the content of Al2Cu phase increases, and the hardness shows a significant increase. After solution treatment at 530 ℃ and aging at 180 ℃ for 8 h, the tensile strength of the alloy with 2.5%Cu reaches the peak of 325.0 MPa, the yield strength reaches 258.8 MPa and the elongation is 4.5%, the strength is equivalent to that of traditional cast iron for electric power fittings.

Key words: aluminum alloy, Cu content, T6 treatment, microstructure and properties

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