The Effect of Transition Elements on High-Temperature Mechanical Properties of Al-Si Foundry Alloys-A Review

The high temperature mechanical performance of Al-Si alloys can be enhanced by alloying with transition metals, induced by the formation of thermally stable and coarsening resistant precipitates in the microstructure. However, the binary dispersoids such as Al3Zr can be less effective due to limitations encountered during conventional manufacturing processes. Further improvements can be achieved through the transformation of these binary trialuminides into ternary or quaternary forms by alloying with appropriate elements. The role of transition elements in improving high temperature mechanical properties of Al-Si alloys from both theoretical and practical viewpoints is critically reviewed.