The effects of microstructure on the wear properties of hypoeutectic Al-10Mg

2

Si alloy after melt superheating treatment were investigated by means of the grinding-disk friction and wear test.The results reveal that the primaryα-Al phase is converted from fishbone to equiaxed structure

and Mg

2

Si phase is uniformly distributed in fibrous and short rod shape after melt superheat treatment.The secondary dendrite interval of Mg

2

Si phase is decreased by 58%

and the hardness is increased by 13.5%

meanwhile the wear rate is decreased by 16.49%.The wear debris is changed from push milling flake type and curl type without melt superheating treatment to small powder shape.The wear debris are converted from pull-chip and crimp type without superheating treatment to small powder shape.The spalling area is decreased

and the spalling pit

furrow and extrusion groove become shallow.The wear mechanism is dominated from adhesive wear

oxidation wear and abrasive wear to coexisting of delamination wear

adhesive wear and partial oxidation wear

which indicate that the melt superheating process can improve the wear properties of the alloy.