均匀化工艺对大尺寸7075铝合金组织和性能的影响  

Effect of Homogenization Process on Microstructure and Properties ofLarge Size 7075 Aluminum Alloy

作　　者：晁代义 于芳 李红萍[3] 高振文 张倩[2] 吕正风 程仁策 CHAO Daiyi;YU Fang;LI Hongping;GAO Zhenwen;ZHANG Qian;LYU Zhengfeng;CHENG Rence(Shandong Nanshan Aluminum Co.,Ltd.,Longkou 265713,China;Yantai Nanshan University,Yantai 265713,China;Shanghai Aircraft Design and Research Institute,Shanghai 201210,China)

机构地区：[1]山东南山铝业股份有限公司,龙口265713 [2]烟台南山学院,烟台265713 [3]上海飞机设计研究院,上海201210

出　　处：《材料导报》2020年第S02期362-364,共3页Materials Reports

摘　　要：本工作主要研究了不同均匀化工艺对大规格7075铝合金铸锭组织的影响以及对轧制薄板性能的影响。研究结果显示:合金的铸态组织主要由Al基体+Mg(Zn,Cu)2相非平衡共晶相组成。465℃/24 h均热后,合金中枝晶组织部分消失,低熔点相溶解不充分。465℃/24 h+478℃/8 h均热后,共晶组织基本消除,残留相主要是难溶解的含Fe相,均匀化效果优异。通过将不同均热后铸锭轧制成薄板,二级均热后的薄板T6态力学最优,抗拉强度为533.5 MPa,屈服强度为455 MPa,延伸率为16.5%。The effects of different homogenization processes on the microstructure of 7075 aluminum alloy ingot and the properties of rolled sheet were studied in this paper.The results show that:the as-cast structure of the alloy is mainly composed of Al matrix+Mg(Zn,Cu)2 phase non-equilibrium eutectic phase.After homogenization at 465℃/24 h,the dendrite structure in the alloy partially disappeared,and the low-melting point phase was not fully dissolved.After 465℃/24 h+478℃/8 h homogenization,eutectic structure is basically eliminated,and the residual phase is mainly the rich-Fe containing phase,with excellent homogenization effect.After different soaking ingot is rolled into thin plate,the T6 state mechanics of the two-stage homogenization is optimal,with tensile strength is 533.5 MPa,yield strength is 455 MPa and elongation is 16.5%.

关 键 词：7075铝合金 低熔点 轧制 薄板 

分 类 号：TG142.71[一般工业技术—材料科学与工程]