粉末冶金Ti-<i>x</i>Nb-5Sn骨科合金的摩擦学行为

doi:10.11896/cldb.21050088

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Abstract In this work, Ti-xNb-5Sn (x=13%, 16%, 18%, 20%,mass fraction) alloys were prepared by powder metallurgy, and the effects of Nb content on the microstructure and tribological behavior of the alloys were studied. The results showed that the Ti-xNb-5Sn alloys were a typical α+β two-phase microstructure. The α phase decreased gradually with the increasing Nb content. When Nb content reached 20wt%, the β phase became the main peak. The hardness and elastic modulus decreased with the increase of Nb content in the ranges of 271HV—319HV and 68—73 GPa, respectively. The minimum friction coefficient of Ti-13Nb-5Sn was 0.41, and Ti-20Nb-5Sn increased to 0.48. The wear rate changed in the range of 1.36×10^-3—1.58×10^-3 mm³/(m·N). With the increase of Nb content, the grinding cracks deepened, delamination phenomenon intensified gradually, and microcracks generated. The Ti-13Nb-5Sn was dominated by abrasive wear. The wear mechanism of Ti-16Nb-5Sn and Ti-18Nb-5Sn changed to abrasive wear together with surface fatigue wear, while the Ti-20Nb-5Sn was surface fatigue wear predominately. This study confirms that Nb is a β-stabilizer. An appropriate amount of Nb can reduce the elastic modulus, and achieve good wear resistance. Ti-xNb-5Sn alloy prepared by molding-sintering is an attractive candidate for orthopedic materials.

Key words： Ti-Nb-Sn alloy powder metallurgy microstructure tribological behavior

Published: 10 November 2022 Online: 2022-11-03

CLC number:

TF125

Fund:National Natural Science Foundation of China(51501073,51975251) and Jiangsu Provincial Natural Science Foundation of China(BK20140162).

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	XIE Fangxia
	YANG Hao
	HUANG Jiabing
	HE Xueming
	YU Jinghu

Cite this article:

XIE Fangxia,YANG Hao,HUANG Jiabing, et al. Tribological Behavior of Ti-xNb-5Sn Orthopedic Alloys Prepared by Powder Metallurgy[J]. Materials Reports, 2022, 36(21): 21050088-5.

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http://www.mater-rep.com/EN/10.11896/cldb.21050088 OR http://www.mater-rep.com/EN/Y2022/V36/I21/21050088

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