Lubricated wear resistance of various aluminum alloys to JIS ADC12 die cast alloy.

Lubricated wear resistance of Al-Mg, Al-Mg-Si and Al-Zn-Mg alloys to die cast aluminum alloy JIS ADC12 was examined. Al-Mg-Si alloy has a best wear resistance in these alloys. Wear resistance of Al-Zn-Mg alloy is inferior to others and its resistance decreases with increase in the amounts of alloying elements, because wear resistance of high concentrated solid solution of this alloy is worse than that of low concentrations. Primary inclusions or precipitated particles is preferable for wear resistance of these alloys, especially, cast structure including primary inclusion is notably effective in the Al-Mg-Si alloys. However, such cast structure is hardly effective in the Al-Zn-Mg alloys. Anodic oxide film gives a notable effect to protect the lubricating wear of these aluminum alloys in such a case.