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AI-Zn-Si alloy bearings are widely used for diesel engines. But recently some cases of fatigue damages and cavitation errosion have been reported in application for new high output engines. Al-Zn-Si alloys were investigated from a metallurgical point of view to prevent such phenomena. It is comfirmed that both addition of magnesium and increase in content of silicon to the alloys are effective for improvement of mechanical properties, especially hardness and tensile strength. A high solidification rate casting makes silicon particle size finer and more uniformly distributed than the conventional casting. Finer and more uniformly dispersed silicon particles improve not only static strength but also fatigue strength and cavitation resistance. The bearings made of the new alloy cast at a high cooling rate show better performance on bearing test machines.

Improvement of cavitation resistance and fatigue strength of Al-Zn-Si alloy engine bearings.