T9I6断续时效对2219铝合金组织和力学性能的影响  

Effect of T9I6 interrupted aging on microstructure and mechanical properties of 2219 aluminum alloy

作　　者：王习锋 陈康华[1,3,2] 陈送义 徐道芬 李福山 WANG Xi-feng;CHEN Kang-hua;CHEN Song-yi;XU Dao-fen;LI Fu-shan(Science and Technology on High Strength Structural Materials Laboratory , Central South University , Changsha410083 , China;Light Alloy Research Institute, Central South University, Changsha 410083, China;Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative InnovationCenter, Central South University , Changsha 410083 , China;Guilin University of AerospaceTechnology , Guilin 541004, China)

机构地区：[1]轻质高强结构材料国防科技重点实验室中南大学,湖南长沙410083 [2]中南大学有色金属先进结构材料与制造协同创新中心,湖南长沙410083 [3]中南大学轻合金研究院,湖南长沙410083 [4]桂林航天工业学院,广西桂林541004

出　　处：《材料热处理学报》2019年第2期55-61,共7页Transactions of Materials and Heat Treatment

基　　金：民用航天技术预先研究项目(B0109);国家自然科学基金委员会-中国航天科技集团公司航天先进制造技术研究联合基金资助项目(U1637601);国家重点研发计划(2016YFB0300801);国家自然科学基金重大科研仪器设备研制专项(51327902)

摘　　要：采用维氏硬度测试、室温拉伸测试、扫描电镜(SEM)以及透射电镜(TEM)等分析方法研究了T9I6断续时效工艺对2219铝合金组织和力学性能的影响。结果表明:2219铝合金T9I6峰值时效的抗拉强度、屈服强度、伸长率分别为490 MPa、385 MPa、12.4%,与T852峰值时效相比,分别提高了9.9%、15.3%、6.0%;这主要是由于在T9I6断续时效中,第二级低温长时的时效会促进析出细小弥散的GP区,经第三级时效得到均匀细小的θ′相。Effects of T9 I6 interrupted aging on microstructure and mechanical properties of 2219 aluminum alloy were studied by means of Vickers hardness test, room temperature tensile test, scanning electron microscopy(SEM) and transmission electron microscopy(TEM). The results show that the tensile strength, yield strength and elongation of the 2219 aluminum alloy after T9 I6 peak aging are 492.22 MPa, 376.83 MPa and 12.28%, respectively, compared with the T852 peak aging, which increase by 10.48%, 12.92% and 5.14%, respectively. This is mainly due to the fact that in the process of T9 I6 interrupted aging, the aging of the second stage at low temperature for a long time will promote the precipitation of small dispersed Guinier Preston(GP) zone, and the uniformly and fine θ′ phase can be obtained in the third stage aging.

关 键 词：2219铝合金 T9I6断续时效 组织 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]