Abstract
A near-eutectic Al-Si alloy has been investigated for its wear behaviour as a function of sliding speed under unlubricated conditions using a pin-on-ring wear-testing machine. The results indicate that the wear rate of the Al-Si alloy initially decreases with increasing sliding speed, reaches a minimum and then increases. Temperature measurements indicate that above a critical sliding speed the rate of temperature increase is higher than that below it. The change in the mechanisms of wear as a function of sliding speed is discussed. The rise in temperature owing to frictional heat appears to be responsible for a change in the wear mechanism. The critical speed depends on the applied pressure and on the thermal diffusivity and hardness of the contacting materials.
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