Cu含量及T6处理对电力金具用铝合金组织性能的影响  

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

作　　者：郑革 陈杰 牛堃宁 林建国 檀朝桂 戴翌龙 Zheng Ge;Chen Jie;Niu Kunning;Lin Jianguo;Tan Chaogui;Dai Yilong(YONGU Group Co.,Ltd.,Wenzhou Zhejang 325600,China;School of Materials Science and Engineering,Xiangtan University,Xiangtan Hunan 411105,China)

机构地区：[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

出　　处：《金属热处理》2022年第8期217-223,共7页Heat Treatment of Metals

基　　金：湖南省科技创新计划(2020RC2080);湖南省自然科学基金(2019JJ60006)。

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AlCu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AlCu相,随着Cu含量的增加,AlCu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。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 AlCu 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 AlCu 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 AlCu 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.

关 键 词：铝合金 CU含量 T6处理 组织性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]