Hidenobu Ohta*, Makoto Takagi*, Toru Imura*, Yoshihito Kawamura** and Akihisa Inoue**
* Department of Mechanical Engineering, Aichi Institute of Technology, Toyota 470-0392 ** Institute for Materials Research, Tohoku University, Sendai 980-8577High strength P/M Al-Ti-Fe-TM(TM: Cr, Mo, V, Zr, Mn, Nb) based alloys were prepared by extrusion of rapidly solidified powders which were produced by the high-pressure He gas atomization technique. It was found that the wear resistance of all the P/M aluminum alloys thus prepared was better than that of the conventional aluminum alloys. The Al92.5Ti2.5Fe2.5Cr2.5 alloy showed the best wear resistance among the P/M aluminum alloys studied in this work. In order to understand the reason for the difference of the wear properties in those P/M aluminum alloys, their wear traces were analyzed using SEM and EPMA. The hard oxide layer was found to be formed on the surface of the wear trace of the Al92.5Ti2.5Fe2.5Cr2.5 alloy. The Al92.5Ti2.5Fe2.5Cr2.5 alloy was also found to be superior in the heat resistance property at elevated temperatures. Through the TEM observation, it was confirmed that the nanocrystalline structure of the Al92.5Ti2.5Fe2.5Cr2.5 alloy remained unchanged even after heat treatment at 673 K for 100 h.
high strength nanocrystalline aluminum alloy, high-pressure helium gas atomization, powder metallurgy, wear resistance, heat resistance