退火处理对粉末冶金CrFeCoNiTi0.2高熵合金组织和性能的影响

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Abstract The CrFeCoNiTi_0.2 high-entropy alloy was prepared by powder metallurgy and was annealed at 450, 650 and 850 ℃. X-ray diffraction analysis, scanning electron microscopy, energy spectrum analysis, dynamic potential polarization curves and micro Vickers hardness test were conducted to study the effect of annealing treatment on microstructure and properties of powder metallurgy CrFeCoNiTi_0.2 high entropy alloy. The results show that the sintered CrFeCoNiTi_0.2 high-entropy alloy has FCC as the main phase and Laves phase as the secondary phase. After annealing, the crystallinity of the FCC phase increases, with the presence of new phases (HCP phase, R phase, σ phase). The self-corrosion potential E_corr and the vickers hardness of the alloy both increase, and the higher the annealing temperature, the better the corrosion resistance and the higher the hardness. After annealing at 850 ℃, the vickers hardness (HV) of the alloy increases from 184 to 356.6.

Key words： high-entropy alloy annealing powder metallurgy microstructure property

Received: 11 April 2019 Published: 14 November 2019

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	JIANG Yue
	ZHOU Guangtai
	LI Xiuming
	CHENG Simeng

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JIANG Yue,ZHOU Guangtai,LI Xiuming, et al. Effects of annealing treatment on microstructure and properties of CrFeCoNiTi_0.2 high-entropy alloys prepared by powder metallurgy[J]. Materials Science and Engineering of Powder Metallurgy, 2019, 24(5): 444-451.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2019/V24/I5/444

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