Abstract
A new sacrificial Al-5Zn-0.03In-Er alloy was developed with improved microstructure consisting of Er rich phase and refined α-Al. This paper focused on the influence of Er as alloying element on the microstructure and hardness of Al-5Zn-0.03In alloy. With the increase of Er content, the α-Al was refined and the hardness was improved, at the same time a amount of Er rich phases and particles also appeared. The segregation of Er in the front of the solidification interface results in the refining of α-Al. The higher hardness of the Er containing alloy make it possilbe to apply the alloy under a complicated enviorment where the mechanical property is requred. It is concluded that 4 wt% Er is optimum to obtain the refined microstructure and proper hardness.
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