Effect of Sintering Temperature on Microstructure and Mechanical Properties of TC4 Alloy

被引：0

作者：

Yang J. ^{[1
,2
]}

Zhang J. ^{[1
,2
]}

Ma W. ^{[3
]}

Du L. ^{[1
,2
]}

Yi J. ^{[1
,2
]}

Gan G. ^{[1
,2
,3
]}

You X. ^{[1
,2
]}

Li F. ^{[1
,2
]}

机构：

[1] Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming

[2] Key Laboratory of Advanced Materials of Yunnan Province, Kunming

[3] Faculty of Material Science and Engineering, Monash University, Melbourne

来源：

Cailiao Yanjiu Xuebao/Chinese Journal of Materials Research | 2019年 / 33卷 / 05期

基金：

中国国家自然科学基金;

关键词：

Mechanical property; Metallic materials; Phase and morphology; Powder metallurgy titanium alloy; TiH[!sub]2[!/sub;

D O I：

10.11901/1005.3093.2018.556

中图分类号：

学科分类号：

摘要：

Ti6Al4V (TC4) alloy was prepared by vacuum sintering of the pressed powder mixture of TiH2, Ti and Al-V alloy. The effect of sintering temperature on the phase constituents, microstructure, density and mechanical properties of the alloy was characterised by XRD, metallography, mechanical tests and SEM fracture morphology. The result shows that the prepared alloy composed of hexagonal α-Ti phase and body-centered cubic β-Ti phase. The alloy presents a microstructure with equiaxed grains, as well as mesh basket or lath (lamellar and acicular) like structures. With the increase of sintering temperature and holding time, the equiaxed grains gradually disappeared, while the amount of lamellar- and acicular-like structures increase and which then were coarsened. The alloy sintered at 1150℃ presents a microstructure with better mesh basket like structures. TC4 Ti-alloyswith relative density of 96.9%~99.6%, tensile strength of 719.3~914.1 MPa, elongation at break of 6.2%~-9.4% and hardness of 313.2~364.8 HV can be obtained by the method. Among others, the alloy with the best mechanical property could be acquired by sintering at 1150℃, which shows tensile strength of 914.1MPa, elongation at break of 7.6% and hardness of 355.5 HV respectively. The fracture morphology was mainly ductile for the alloy prepared by sintering of powder mixture of Ti and pure TiH2, and it gradually turns into brittle-tough mixed fracture with the increasing amount of Al-V alloy powder was added, correspondingly, the tensile strength of the prepared alloys increased but the elongation at break decreased. © All right reserved.

引用

页码：338 / 344

页数：6

共 21 条

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