Microstructure and Mechanical Properties of High Vacuum Die-Cast AlSiMgMn Alloys at as-Cast and T6-Treated Conditions

Fei Liu; Haidong Zhao; Runsheng Yang; Fengzhen Sun

doi:10.3390/ma12132065

Microstructure and Mechanical Properties of High Vacuum Die-Cast AlSiMgMn Alloys at as-Cast and T6-Treated Conditions

Materials (Basel). 2019 Jun 27;12(13):2065. doi: 10.3390/ma12132065.

Authors

Fei Liu¹, Haidong Zhao², Runsheng Yang¹, Fengzhen Sun³

Affiliations

¹ National Engineering Research Center of Near-net Shape Forming for Metallic Materials, South China University of Technology, Guangzhou 510641, China.
² National Engineering Research Center of Near-net Shape Forming for Metallic Materials, South China University of Technology, Guangzhou 510641, China. hdzhao@scut.edu.cn.
³ Department of Mechanical Engineering, Imperial College London, Exhibition Road, London SW7 2AZ, UK.

Abstract

Al-Si-Mg based alloys can provide high strength and ductility to satisfy the increasing demands of thin wall castings for automotive applications. This study has investigated the effects of T6 heat-treatment on the microstructures, the local mechanical properties of alloy phases and the fracture behavior of high vacuum die-cast AlSiMgMn alloys using in-situ scanning electron microscopy (SEM) in combination with nano-indentation testing. The microstructures of the alloys at as-cast and T6 treated conditions were compared and analyzed. It is found that the T6 heat treatment plays different roles in affecting the hardness and the Young's modulus of alloy phases. This study also found that the T6 heat treatment would influence the failure modes of the alloys. The mechanisms of crack propagation in the as-cast and T6 treated alloys were also analyzed and discussed.

Keywords: AlSiMgMn alloys; Fracture; In-situ SEM observation; Microstructure; T6 heat treatment.

Abstract

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