한국주조공학회지 (Journal of Korea Foundry Society)

  • 제34권6호
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  • Pages.194-199
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  • 2014
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  • 1598-706X(pISSN)
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  • 2288-8381(eISSN)
한국주조공학회 (Korea Foundry Society)
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Al-5Mg 합금의 내산화성 및 인장특성에 미치는 Al2Ca의 영향

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

  • 하성호 (한국생산기술연구원 희소금속연구실용화그룹) ;
  • 윤영옥 (한국생산기술연구원 희소금속연구실용화그룹) ;
  • 김세광 (한국생산기술연구원 희소금속연구실용화그룹)
  • 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)
  • 투고 : 2014.09.03
  • 심사 : 2014.10.24
  • 발행 : 2014.12.31
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초록

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.

키워드

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