Effects of sintering temperature on microstructure and mechanical properties of Ti600 alloy fabricated by powder metallurgy
DING Chao1,2, ZOU Liming2, LIU Xin2, HANG Zhengxiang1, WU Wei1, LI Runxia1
1. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China; 2. Guangdong Institution of Materials and Processing, Guangdong Academy of Sciences, Guangzhou 510650, China
Abstract：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 disordered α lamellar at the sintering temperature of 1 100 ℃, the α lamellar begins to arrange regularly to α colonies at the sintering temperature of 1 200 ℃, the α lamellar basically forms to α colonies at the sintering temperature of 1 300 ℃. The Zr and Mo elements dissolve in the β-Ti phase, the Al element dissolves in the α-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 and α-Ti phase in the alloy gradually decrease, the amount of β-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%.
丁超, 邹黎明, 刘辛, 杭争翔, 吴伟, 李润霞. 烧结温度对粉末冶金Ti600合金组织与力学性能的影响[J]. 粉末冶金材料科学与工程, 2019, 24(1): 8-14.
DING Chao, ZOU Liming, LIU Xin, HANG Zhengxiang, WU Wei, LI Runxia. Effects of sintering temperature on microstructure and mechanical properties of Ti600 alloy fabricated by powder metallurgy. Materials Science and Engineering of Powder Metallurgy, 2019, 24(1): 8-14.
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2019, Vol. 24 
