Abstract
This study investigated the effect of Sc addition on the microstructure and mechanical properties of a high-Zn-concentration Al (Al–49Zn) alloy. The addition of 0.5Sc obviously refined the Al grains and Zn phases in the Al–49Zn alloy during solidification. It also suppressed the Al grain coarsening and Zn dissolution in the Al–49Zn alloy during heat treatment because of the pinning effect of nanoscale Al3Sc precipitates and Sc atoms. Given its refined structure and high thermal stability, the Al–49Zn–0.5Sc alloy showed high hardness and mechanical stability after heating.
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