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pISSN : 1598-706X / eISSN : 2288-8381


한국주조공학회지 (36권6호 195-201)

Effects of Mg Addition on Heat Treatment and Mechanical Properties of A356 Alloy

Mg 첨가에 따른 A356 합금의 열처리 및 기계적 특성 변화

Jae-Chan Jo*, Kwang-Sam Kim*, In-Taek Im**, Dae-Hwan Kim*,***, Sung-Yong Shim**** and Su-Gun Lim*,***†

*Dept. of materials manufacturing processing, Gyeongsang National Univ., Jinju 52828, Korea, **Dept. of production engineering, Gyeongsang National Univ., Jinju 52828, Korea, ***ReCAPT, Gyeongsang National Univ., Jinju 52828, Korea, ****Korea Aerospace In



The effects of Mg addition on heat treatment and mechanical properties of A356 alloy were were investigated. With increased amounts of Mg addition to A356 alloy, the grain size decreased and eutectic Si was refi refined. And, this process can improve the mechanical properties. Solid solution heat treatment causes the spheroidizing of eut eutectic Si. In this study, although eutectic Si was refined with Mg addition, solid solution time increased from 2 hours to 6 hours with Mg Mg addition, and aging time also increased, from 4 hours to 8 hours. After heat treatment, Mg2Si remained in a formation of C Chinese script. And, Chinese script Mg2Si formed with Mg addition caused a reduction of the elongation of the alloys according to the stress concentration.


A356, Mg addition, Heat treatment, Mg2Si phase, Refinement