不同温度低压真空渗氮对新型TiZr基合金微观组织及摩擦学性能的影响

doi:10.11896/cldb.21060143

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Abstract Novel TiZr-based alloy Ti-47Zr-5Al-3V (referred to as 47Zr) was studied to reveal the effect of low-pressure vacuum nitriding at different temperatures (650 ℃, 700 ℃, 750 ℃, 800 ℃ and 850 ℃) on its tribological properties. Microstructure, phase composition, hardness and tribological properties of 47Zr alloy with low-pressure vacuum nitriding were analyzed and tested by scanning electron microscopy (SEM), X-ray diffraction (XRD), micro-Vickers and UMT-2 multifunctional tribometer. The results indicate that the surface phase composition of nitriding 47Zr alloy is dominated by Ti₂N and ZrN compounds, and its hardness is high up to 710HV_0.05. Compared with the substrate, the average hardness of the surface increases by nearly 285HV_0.05. The depth of nitrided layer increases with nitriding temperature rising. Compared with the untreated samples, the average coefficient of friction (COF) decreases by 57.14% through low-pressure vacuum nitriding at 750 ℃, and the wear rate decreases by 29.74% under a normal load of 30 N. Through nitriding at 800 ℃, the average COF and wear rate decrease by 45.71% and 33.74%, respectively. The wear characteristics show that the wear mechanism of the low-pressure vacuum nitrided 47Zr alloy at different temperature is abrasive wear and adhesive wear under dry sliding condition.

Key words： TiZr-based alloy nitriding microstructure friction and wear

Published: 10 September 2022 Online: 2022-09-10

CLC number:

TB333

Fund:National Natural Science Foundation of China (51801054).

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	Articles by authors
	LYU Yuanyuan
	YUE Yun
	DU Zhihao
	DU Sanming
	NI Feng
	ZHANG Yongzhen

Cite this article:

LYU Yuanyuan,YUE Yun,DU Zhihao, et al. Effect of Low-pressure Vacuum Nitriding Temperatures on Microstructure and Tribological Properties of Novel TiZr-based Alloy[J]. Materials Reports, 2022, 36(17): 21060143-7.

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http://www.mater-rep.com/EN/10.11896/cldb.21060143 OR http://www.mater-rep.com/EN/Y2022/V36/I17/21060143

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