Dry sliding wear behaviour of hypereutectic Al-Si piston alloys containing iron-rich intermetallics

The effect of iron rich intermetallics on the wear behaviour of Al-Si hypereutectic alloys has been studied Dry sliding wear tests have been conducted using a pin on disk machine under different normal loads of 18 51 74 and 100 N and at a constant sliding speed of 0 3 m/s The addition of 1 2 wt % Fe to the LM28 alloy increased the wear rate due to the formation of needle beta intermetallics Introducing 0 6 wt % Mn to the iron rich alloy changed the beta intermetallics into the modified alpha phases and therefore reduced the detrimental effect of iron TIG welding method as a surface melting process was applied on the iron and manganese containing alloy and led to a fine microstructure and increased the wear resistance (C) 2010 Elsevier Inc All rights reserved