The effect of magnesium addition on dry sliding wear characteristics of thixoformed Al-Si-Cu aluminum alloy was investigated. A pin-on-disc tribometer was used to carry out wear tests at 49N, 1m/s speed and 9Km distance. It was observed that increasing in Mg content up to 1.5 wt.% improves wear resistance and hardness of the thixoformed alloys. Addition of more than 1.5 wt.% Mg, however, led to increase in hardness, but resulting in a lower wear resistance. The dominant wear mechanism is a combination of abrasion and adhesion at low Mg content alloys and delamination with some abrasion at high Mg alloy.

MITC2015-pp 94-95