MERALS AND METAL MATRIX COMPOSITES |
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Effect of Low-pressure Vacuum Nitriding Temperatures on Microstructure and Tribological Properties of Novel TiZr-based Alloy |
LYU Yuanyuan1,2, YUE Yun1,*, DU Zhihao1,2, DU Sanming1, NI Feng1, ZHANG Yongzhen1
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1 National United Engineering Laboratory for Advanced Bearing Tribology, Henan University of Science and Technology, Luoyang 471023, Henan, China 2 School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, Henan, China |
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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 710HV0.05. Compared with the substrate, the average hardness of the surface increases by nearly 285HV0.05. 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.
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Published: 10 September 2022
Online: 2022-09-10
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Fund:National Natural Science Foundation of China (51801054). |
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