High temperature tribological behavior of a Ti-46Al-2Cr-2Nb intermetallics

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• 作者：Jun Cheng ; Jun Yang ; Xinghua Zhang ; Hong Zhong ; Jiqiang Ma ; Fei Li ; Licai Fu ; Qinling Bi ; Jinshan Li ; Weimin Liu
• 关键词：A. Titanium aluminides ; based on TiAl ; B. Tribological properties
• 刊名：Intermetallics
• 出版年：2012
• 出版时间：December, 2012
• 年：2012
• 卷：31
• 期：Complete
• 页码：120-126
• 全文大小：1261 K

文摘

Tribological behavior of a Ti-46Al-2Cr-2Nb alloy, produced by hot-pressed sintering, was investigated using a home-built ball-on-disc tribotester against a Si₃N₄ ceramic ball at a constant speed of 0.188?m?s^?1 and an applied load of 10?N from 20 to 900?¡ãC. It was found that the friction coefficient decreased slowly with increasing temperature from 20 to 600?¡ãC, and then rose and reached the highest value at 800?¡ãC, but slightly dropped at 900?¡ãC. The wear rate of the alloy, in the magnitude of 10^?4 mm³/Nm, increased mildly with increasing temperature to a maximum value at 400?¡ãC and then dropped rapidly from 600 to 800?¡ãC, and increased a little at 900?¡ãC. The wear mechanism of the alloy transformed from mainly ploughing and small delamination wear at 20-700?¡ãC to plastic deformation and adhesive wear at 800 and 900?¡ãC. The transition of the wear mechanism occurred between 700 and 750?¡ãC. The friction and wear behavior of the hot-pressed Ti-46Al-2Cr-2Nb alloy was comparable to that of a vacuum casting Ti-41.7Al-8.3Nb-0.09Y alloy measured under the same conditions for comparative purposes.