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

doi:10.11901/1005.3093.2018.556

Chinese Journal of Materials Research

2019, Vol. 33

Issue (5): 338-344 DOI: 10.11901/1005.3093.2018.556

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

Jun YANG^1,²,Jiamin ZHANG^1,²(

),Wenjin MA³,Lihui DU^1,²,Jianhong YI^1,²,Guoyou GAN^1,^2,³,Xin YOU^1,²,Fengxian LI^1,²

1. Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming 650093，China
2. Key Laboratory of Advanced Materials of Yunnan Province, Kunming 650031，China
3. Faculty of Material Science and Engineering, Monash University, Melbourne 3800, Australia

Cite this article:

Jun YANG,Jiamin ZHANG,Wenjin MA,Lihui DU,Jianhong YI,Guoyou GAN,Xin YOU,Fengxian LI. Effect of Sintering Temperature on Microstructure and Mechanical Properties of TC4 Alloy. Chinese Journal of Materials Research, 2019, 33(5): 338-344.

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Abstract

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.

Key words: metallic materials powder metallurgy titanium alloy TiH₂ phase and morphology mechanical property

Received: 13 September 2018

ZTFLH:

TG146.2+3

Fund: Supported by National Natural Science Foundation of China(51464027)

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	Articles by authors
	Jun YANG
	Jiamin ZHANG
	Wenjin MA
	Lihui DU
	Jianhong YI
	Guoyou GAN
	Xin YOU
	Fengxian LI

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https://www.cjmr.org/EN/10.11901/1005.3093.2018.556 OR https://www.cjmr.org/EN/Y2019/V33/I5/338

Fig.1 TiH₂-Al-V blank (a), sintered specimen (b) and tensile specimen (c)

Fig.2 XRD diffraction pattern of specimens of heat pre-servation for (a) 1.5 h, (b) 2 h, (c) 2.5 h at 1100, 1150 and 1200℃

Fig.3 Metallographic structure of TC4 specimens (a) 1100℃-1.5 h, (b) 1150℃-1.5 h; (c) 1200℃-1.5 h, (d) 1100℃-2 h; (e)1150℃-2 h; (f) 1200℃-2 h; (g) 1100℃-2.5 h; (h) 1150℃-2.5 h; (i) 1200℃-2.5 h

Table 1 Relative density of samples before and after sintering (%)

Table 2 Tensile properties of TiH₂-6Al-4V sample

Table 3 Tensile properties of samples sintering at 1150℃ for 1.5 h with different compositions

Fig.4 Tensile fracture morphology of specimen for 1.5 h at 1150℃ (a) TiH₂, (b) TiH₂-3Al-2V, (c) TiH₂-6Al-4V, (d) Ti-6Al-4V

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