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http://dx.doi.org/10.7777/jkfs.2014.34.6.194

Effect of Al2Ca on Oxidation Resistance and Tensile Property of Al-5Mg Alloy  

Ha, Seong-Ho (Rare Metal R&BD Group, Korea Institute of Industrial Technology)
Yoon, Young-Ok (Rare Metal R&BD Group, Korea Institute of Industrial Technology)
Kim, Shae K. (Rare Metal R&BD Group, Korea Institute of Industrial Technology)
Publication Information
Journal of Korea Foundry Society / v.34, no.6, 2014 , pp. 194-199 More about this Journal
Abstract
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.
Keywords
Al-Mg alloy; $Al_2Ca$; Oxidation resistance; Tensile property;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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