Dry sliding wear of MA/PM Al-10Ti alloy
(Department of Materials Science & Engineering,
Zhejiang University, Hangzhou 310027, P.R.China)
Zhejiang University, Hangzhou 310027, P.R.China)
Abstract: Dry sliding wear behaviors of the Al-10Ti alloy prepared by mechanical alloying (MA) were investigated and compared with those of the alloy obtained by the rapid solidification (RS) process. The results show that, under low sliding velocity of 0.66 m/s and low applied load, the predominant wear mechanism of Al-10Ti alloy against carbon steel is adhesion. The fine dispersing reinforcement in the alloy promotes the nucleation and propagation of cracks on the subsurface, leading to a higher wear rate of MA Al-10Ti alloy, compared with that of RS Al-10Ti alloy. With increasing normal load, the formation and spallation of transfer layers on the worn surface become the predominant wear mechanism. Therefore, the wear resistance of the alloy obtained by MA surpasses that achieved by RS due to the higher strength at both ambient and elevated temperature. The wear transfer layer of the MA Al-10Ti alloy is determined to be consisted mainly of Fe2O3 and metal Fe.
Key words: Al-Ti alloy; sliding wear; mechanical alloying; rapid solidification(RS)