Microstructure and wear resistance of Ti-3Zr-2Sn-3Mo-15Nb (TLM) alloy
(1. Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China;
2. State Key Laboratory for Turbulence and Complex System,
Department of Mechanics and Engineering Science, Peking University, Beijing 100871, China)
2. State Key Laboratory for Turbulence and Complex System,
Department of Mechanics and Engineering Science, Peking University, Beijing 100871, China)
Abstract: The effects of heat treatment on the microstructure and phase constitution of Ti-3Zr-2Sn-3Mo-15Nb (TLM) alloy were investigated by optical microscopy, X-ray diffractometry and transmission electron microscopy. The wear resistance of TLM alloy was tested by sliding wear in comparison with as-annealed Ti-6Al-4V and as-aged Ti-13Nb-13Zr. The results show that the specimen cooled from α+β dual phase region is mainly composed of β, α and α″ phases, while the specimen cooled from β single phase region is mainly composed of β and α phases, in which β phase is predominate. The coefficient of friction of TLM alloy treated at 680 ℃, 1 h, AC+510 ℃, 6 h, AC is smaller than that of others, thereby TLM alloy has a better wear resistance which is also proved by the surface topography after wear test.
Key words: Ti-3Zr-2Sn-3Mo-15Nb alloy; microstructure; wear resistance; phase constitution; β titanium alloy