Friction and Wear Properties of Solution-Treated and Aging-Treated Mg-Al-Zn Alloys
Ryo YOSHIOKA, Takashi MATSUOKA, Kazuhiko SAKAGUCHI Toshiji MUKAI and Akihiro MURATA
Abstract:In this study, dry wear tests were carried out to investigate the friction and wear properties of magnesium alloys by using a pin-on-disk wear testing machine at room temperature. Mg-Al-Zn (AZ31, AZ61 and AZ91) alloys were used as test specimens. Mg-Al-Zn alloys fabricated by extrusion method of processing were tested. Furthermore, two kinds of specimens were prepared by heat treatment: one is solution-treated at 413 for 48 hours and the other is aging-treated at 150 for 100 hours after solution treatment. SUJ2 was used as a disk material. Wear rates and coefficients of friction were investigated under constant conditions. The main results obtained were as follows. (1) The coefficient of friction decreased with the increment of aluminum content. In addition, it decreased with aging treatment. (2) The wear resistance of solution-treated Mg-Al-Zn alloys was independent of aluminum content. (3) The wear resistance of an aging-treated AZ61 alloy was same compared with a solution-treated one. On the other hand, the wear resistance of an aging-treated AZ91 alloy deteriorated compared with a solution-treated one. Consequently, the wear resistance of aging-treated Mg-Al-Zn alloys was dependent on aluminum content. It was confirmed that precipitated particles had an influence upon the wear resistance of aging-treated Mg-Al-Zn alloys. Key Words:Magnesium alloy, Friction, Wear, Pin-on-disk, Solution treatment, Accelerated aging, Vickers hardness