烧结温度对粉末冶金Ti600合金组织与力学性能的影响  

Effects of sintering temperature on microstructure and mechanical properties of Ti600 alloy fabricated by powder metallurgy

作　　者：丁超 邹黎明[2] 刘辛[2] 杭争翔[1] 吴伟[1] 李润霞[1] DING Chao;ZOU Liming;LIU Xin;HANG Zhengxiang;WU Wei;LI Runxia(School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China;Guangdong Institution of Materials and Processing, Guangdong Academy of Sciences, Guangzhou 510650, China)

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳100870 [2]广东省科学院广东省材料与加工研究所,广州510650

出　　处：《粉末冶金材料科学与工程》2019年第1期8-14,共7页Materials Science and Engineering of Powder Metallurgy

基　　金：辽宁省教育厅项目(201624083);国家自然科学基金资助项目(51504072);广州市对外科技合作专项(2014J4500024);广东省国际合作专项(2014B050503003);广东省公益研究与能力建设专项(2017A070702019)

摘　　要：采用混合元素粉末法,通过冷等静压成形和真空烧结,制备Ti600合金(名义成分为Ti-6Al-2.8Sn-4Zr-0.5Mo-0.4Si-0.1Y),研究烧结温度对合金显微组织以及密度与力学性能的影响。结果表明,烧结温度为1 100℃时,合金组织为杂乱无章的α层片组织,而在1 200℃下烧结时α层片组织开始规则排列,形成α丛束,当烧结温度达到1 300℃时,α层片组织基本都形成α丛束。在合金组织中Zr元素和Mo元素固溶于β-Ti相,Al元素固溶于α-Ti相,Si元素富集于析出物,Sn、Y元素分布均匀。随烧结温度升高,合金中孔隙和α-Ti相数量逐渐减少,β-Ti相数量逐渐增加,合金的致密度提高,力学性能明显提升,1 300℃温度下烧结的合金致密度为92.8%,硬度(HV)为324.0,抗拉强度和伸长率分别为622.6 MPa和5.0%。Ti600 alloy(with a nominal composition of Ti-6Al-2.8Sn-4Zr-0.5Mo-0.4Si-0.1Y)was prepared by cold isostatic pressing and vacuum sintering using the mixed element powder method.The effects of sintering temperature on the microstructure,density and mechanical properties of the alloy were investigated.The results show that the microstructure of Ti600 alloy is composed of disorderedαlamellar at the sintering temperature of 1 100℃,theαlamellar begins to arrange regularly toαcolonies at the sintering temperature of 1 200℃,theαlamellar basically forms toαcolonies at the sintering temperature of 1 300℃.The Zr and Mo elements dissolve in theβ-Ti phase,the Al element dissolves in theα-Ti phase,and the Si element enriches in the precipitates,the Sn and Y elements distribute uniformly.With increasing the sintering temperature,the numbers of pores andα-Ti phase in the alloy gradually decrease,the amount ofβ-Ti phase gradually increases,and the density and the mechanical properties of the alloy increase.The alloy sintered at 1 300℃has the relative density of 92.8%,the hardness(HV)of 324.0,the tensile strength of 622.6 MPa and elongation of 5.0%.

关 键 词：粉末冶金 TI600合金 显微组织 力学性能 元素分布 

分 类 号：TF124[冶金工程—粉末冶金]