pISSN : 1598-706X / eISSN : 2288-8381
한국주조공학회지 (30권1호 29-33)
Effects of Alloying Elements on the Properties and Aging Hardening of Al-5%Mg Based Casting Alloys
Al-5%Mg계 주조합금의 물성 및 시효경화특성에 미치는 합금원소의 영향
Jeong-Min Kim, Joon-Sik Park, Jae-Ik Cho*, Hyun-Gil Kim**
Hanbat National University, *Kwangju R&D Center, Korea Institute of Industrial Technology, **Advanced Core Materials Lab, Korea Atomic Energy Research Institute
The microstructure of Al-5%Mg based alloy mainly consists of aluminum matrix with a small amount of AlMn phase. The addition of Sc or Zn to the base alloy significantly improved the as-cast tensile strength, while the addition of Fe deteriorated both strength and ductility. Although the Al-5%Mg based alloy was not heat-treatable, aging hardening could be observed in the case that Sc or Zn was added to the base alloy. TEM analysis showed that very fine AlSc or AlMgZn precipitates were formed after T6 heat treatment, resulting in enhanced strength. The corrosion resistance measured as corrosion potential was found to decrease a little by adding Zn, whereas other alloying elements were not clearly influential.
Aluminum, Casting, Tensile properties, Corrosion.
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