放电等离子烧结Ti-1Al-8V-5Fe合金的致密化机理

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Abstract TiH₂, FeV₈₀, Al and Fe powders were used as raw materials, and the spark plasma sintering was used to prepare Ti-1Al-8V-5Fe (Ti185) alloys at 800-1 200 ℃ for 10min. The effective stress exponent (n) and the densification activation energy (Q_d) were evaluated by the sintering densification curve and mature creep model, which were used to study the densification kinetics of Ti185 alloys. The results showed that the alloys were rapidly densified without obvious grain growth at low temperature (800-1 000 ℃). When sintering temperature reached 1 100 ℃, the alloys were slowly densified with obvious grain growth. During sintering at 800-1 000 ℃, the densification stage in the early stage of dwelling had low effective stress exponent n and apparent activation energy Q_d(n=1, Q_d=52 kJ/mol), which was the stage of low effective stress, and grain boundary diffusion controlled the densification process of alloys. However, the later stage of dwelling corresponded to a higher effective stress stage, with n=3 and Q_d=175.7 kJ/mol. The densification mechanism of the alloys was controlled by dislocation climbing.

Key words： spark plasma sintering Ti-1Al-8V-5Fe densification mechanism effective stress exponent activation energy

Received: 24 May 2020 Published: 18 September 2020

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	LI Wenjie
	ZENG Fanhao
	LI Lei
	WANG Ziwei
	LIU Honghao
	PENG Yirui
	GU Yi

Cite this article:

LI Wenjie,ZENG Fanhao,LI Lei, et al. Densification mechanism of Ti-1Al-8V-5Fe alloy by spark plasma sintering[J]. Materials Science and Engineering of Powder Metallurgy, 2020, 25(4): 344-351.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2020/V25/I4/344

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