双时效对Ti-4Al-5Mo-6Cr-5V-1Nb合金显微组织和力学性能的影响  

Effect of Duplex Aging on Microstructure and Mechanical Property of Ti-4Al-5Mo-6Cr-5V-1Nb Alloy

作　　者：郭彦霖 罗群 王国旗[2] 刘斌 陈玮[4] 李谦 Guo Yanlin;Luo Qun;Wang Guoqi;Liu Bin;Chen Wei;Li Qian(Materials Genome Institute,Shanghai University,Shanghai 200444,China;School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China;State Key Laboratory of Advanced Special Steel,Shanghai University,Shanghai 200444,China;AVIC Manufacturing Technology Institute,Beijing 100024,China)

机构地区：[1]上海大学材料基因组工程研究院,上海200444 [2]上海大学材料科学与工程学院,上海200444 [3]上海大学省部共建高品质特殊钢冶金与制备国家重点实验室,上海200444 [4]中国航空制造技术研究院,北京100024

出　　处：《稀有金属材料与工程》2020年第4期1395-1401,共7页Rare Metal Materials and Engineering

基　　金：航空科学基金(2017ZF25022)。

摘　　要：研究了固溶、固溶后单时效以及固溶后双时效处理对Ti-4Al-5Mo-6Cr-5V-1Nb合金组织和力学性能的影响。结果表明,820℃下固溶0.5 h后,合金中的α相完全溶解;单/双时效合金的硬度均随时效时间增加先升高后降低;合金经300℃/8 h+500℃/8 h双时效处理后可达到4580 MPa的峰值硬度(HV),1462 MPa抗拉强度以及3.4%延伸率,其强度比原始合金高6%,也高于单时效合金。界面能计算结果表明ω相使α相形核的阻力降低50%,促进了α相的析出并细化α板条,从而提升合金的硬度,强度及塑性。The effects of solution treatment,single aging treatment after solution treatment,and duplex aging treatment after solution treatment on the microstructure and mechanical property of Ti-4Al-5Mo-6Cr-5V-1Nb alloy were studied.The results show that after the solution treatment at 820℃for 0.5 h,αphase completely dissolves.The hardness of single/duplex aging treated alloys both increases at the beginning and then decreases.The alloy duplex aging treated at 300℃for 8 h and 500℃for 8 h possesses the peak-aging hardness(HV)of 4580 MPa,ultimate tensile strength(UTS)of 1462 MPa and elongation of 3.4%,whose UTS is 6%higher than that of original alloy and even higher than that of single aging treated alloy.The calculation of interface energy indicates thatωphase can promote the precipitation ofαphase and the refinement ofαlath by decreasing the nucleation resistance ofαphase by 50%,thus increasing the hardness,strength,and elongation of alloys.

关 键 词：Ti-4Al-5Mo-6Cr-5V-1Nb合金 双时效 力学性能 显微组织 

分 类 号：TG146.23[一般工业技术—材料科学与工程]