时效工艺对新型超高强高韧7A56铝合金厚板组织和性能的影响  

Effect of aging process on microstructure and properties of 7A56 aluminum alloy thick plate

作　　者：董浩 周华 罗鹍 陈可 赵藤 Dong Hao;Zhou Hua;Luo Kun;Chen Ke;Zhao Teng(Southwest Aluminum(Group)Co.,Ltd.,Chongqing 401326,China)

机构地区：[1]西南铝业(集团)有限责任公司,重庆401326

出　　处：《铝加工》2023年第6期20-25,共6页Aluminium Fabrication

基　　金：重庆市九龙坡区科技计划项目(2021-03-001-Z)。

摘　　要：研究了单级时效和三级时效工艺对新型超高强高韧7A56铝合金厚板组织和性能的影响。采用透射电镜、布氏硬度计、金属材料断裂韧度实验机、热差扫描仪以及多功能拉伸实验机等多种检测仪器,对7A56铝合金厚板在不同时效工艺下的组织和性能进行了表征与测试。结果表明:7A56铝合金厚板单级峰值时效工艺为120℃/24 h,抗拉强度达到636 MPa,断裂韧性达到26.12 MPa·m^(1/2);三级时效工艺可以有效提升7A56铝合金厚板强度与韧性的匹配程度,三级时效制度为120℃/24 h+175℃/90 min+120℃/24 h,抗拉强度达到626 MPa,断裂韧性达到31.56 MPa·m^(1/2)。The effects of one-stage aging and three-stage aging processes on the microstructure and properties of 7A56 aluminum al-loy thick plates were studied in this paper.The microstructure and properties of 7A56 aluminum alloy thick plates under different ag-ing processes were characterized by transmission electron microscopy,Brinell hardness tester,metal fracture toughness test machine,thermal difference scanner and multifunctional tensile test machine.The results show that:(1)The one-stage peak aging process of 7A56 aluminum alloy thick plate is 120℃/24h,and the tensile strength and fracture toughness are up to 636MPa and 26.12MPa·m^(1/2);(2)The three-stage aging process can effectively improve the matching problem of strength and toughness of 7A56 aluminum alloy thick plate.The three-stage aging temper is 120℃/24h+175℃/90min+120℃/24h,and the tensile strength and fracture toughness can reach 626MPa and 31.56MPa·m^(1/2).

关 键 词：7A56铝合金 单级时效 三级时效。 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG156.92[金属学及工艺—金属材料]