TC4合金的磨损率及磨损表面层的显微组织变化

Study on Dry Sliding Wear of TC4 Alloy in Vacuum

摘要:

在空气和真空(10^-5Pa)条件下对TC4合金进行了系统的磨损性能测试，研究了载荷和滑动速度对TC4合金磨损率的影响。对TC4合金磨损后的表面层进行了显微组织分析。试验结果表明，空气磨损后表面层的显微组织在较低滑动速度下呈现位错的滑移带，在较高滑动速度下出现显微裂纹。真空磨损后表面层的显微组织发生细化并具有50nm～100nm尺寸，显微组织中呈现大量的位错，在较高滑动速度下有孪晶出现。

关键词:钛合金 磨损 显微组织 变形 真空

Abstract:

Wear properties of TC4 alloy were systematically tested in air and vacuum (10-5Pa). The effects of load and sliding velocity on the wear rate of TC4 alloy were studied, and the microstructural analysis of the worn surface layer of TC4 alloy were carried out. In air, the microstructure of the surface layer presented slid band of dislocation at the lower sliding velocity, and micro-crack at the higher sliding velocity. In vacuum, the microstructure of the surface layer was refined to a gain size range of 50 nm~100 nm and comprised of high density of dislocations. Twins existed in the substructure of the surface layer at higher sliding velocities.

Key words:titanium alloy,wear,microstructure,deformation,vacuum