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


(논문)연구논문

한국주조공학회지 (31권5호 293-301)

Effect of Ca additions on Mechanical Properties of Mg-4Al-2Sn-xCa Die-Casting Alloys

Ca 첨가에 따른 Mg-4Al-2Sn-xCa 다이캐스팅 합금의 기계적특성 연구

Young-Min Kim, Young-Cheol Lee, Yong-Ho Park*

Korea Institute of Industrial Technology, *Pusan National University

Abstract

Representative magnesium alloys applied to the die-casting are AZ91, AM60, etc., and the application of these alloys is restricted to components operating at moderate temperatures, due to grain boundary siding of β-phase(Mg17Al12) at temperatures above 120oC. Heat-resistant magnesium alloys such as AE42, AE44 have been developed, but that have been too burdensome to produce because of the expensive rare earth materials. Research work for the development of low-priced heat-resistant magnesium alloy is actively in progress and positive results are being reported. This study aims to investigate the effect of Ca additions on mechanical properties of Mg-4Al-2Sn heat resistant magnesium alloys. Mg-4Al-2Sn alloys with Ca (0wt.%, 0.3wt.%, 0.7wt.%, 1wt.%) have been produced through the die-casting process for the development of low-priced heat- resistant magnesium alloy, and high temperature tensile tests are performed using the specimens. The results showed that mechanical properties of Mg-4Al-2SnxCa increased with the addition of Ca up to 0.7wt.% Ca and further addition of Ca deteriorated the mechanical properties of the alloys. A significant amount of porosity was observed at the sample with 1wt%. Ca and the longer freezing range of the alloy was believed to cause the formation of porosity.

Keywords

Mg alloy, Mg-4Al-2Sn, Heat-resistant magnesium alloys, Porosity. Tensile property.