Al-5Mg 합금의 내산화성 및 인장특성에 미치는 Al 2 Ca의 영향

• Published in: 한국주조공학회지 Vol. 34; no. 6; pp. 194 - 199
• Main Authors: 하성호, 윤영옥, 김세광, Ha, Seong-Ho, Yoon, Young-Ok, Kim, Shae K
• Format: Journal Article
• Language: Korean
• Published: 2014
• Subjects: Al-Mg alloy; Oxidation resistance; Al_2Ca; Tensile property
• ISSN: 1598-706X; 2288-8381

The effect of $Al_2Ca$ on the oxidation resistance and tensile property of Al-5Mg alloys was investigated. According to the TGA (Thermogravimetric analysis) result at $550^{\circ}C$ after 24hrs, the Al-5Mg alloy showed parabolic behavior with weight gain. On the other hand, there was almost no difference in the weight changes of the $Al_2Ca$ added Al-5Mg alloys during the oxidation. It was thought that the improvement of oxidation resistance in $Al_2Ca$ added Al-5Mg alloys might be due to the formation of a protective oxide layer with CaO and MgO on the surface. The microstructures of the alloys showed grain refinement with an increasing $Al_2Ca$ content. From the tensile test, the yield strength of the alloys were improved with an increasing $Al_2Ca$ content. The 0.07 mass%$Al_2Ca$ added Al-5Mg alloy showed similar elongation and increased strength, simultaneously. It was considered that the addition of $Al_2Ca$, which was superior in the oxidation resistance of Al, reduced the formation of Mg oxides and inclusions during the alloying. This, partly led to the improvement of tensile properties.