Journal of Korea Foundry Society (한국주조공학회지)

Korea Foundry Society (한국주조공학회)
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Effect of calcium addition on creep properties in Mg-Zn-Y alloys

Mg-Zn-Y 합금의 크리프 저항성에 미치는 칼슘의 영향

  • Lee, Yoon-Hee (Center for Non-crystalline Materials/Dept. of Metallurgical Eng., Yonsei University) ;
  • Lim, Hyun-Kyu (Center for Non-crystalline Materials/Dept. of Metallurgical Eng., Yonsei University) ;
  • Kim, Do-Hyung (Center for Non-crystalline Materials/Dept. of Metallurgical Eng., Yonsei University) ;
  • Kim, Do-Hyang (Center for Non-crystalline Materials/Dept. of Metallurgical Eng., Yonsei University)
  • 이윤희 (준결정재료 연구단/연세대학교 금속시스템공학과) ;
  • 임현규 (준결정재료 연구단/연세대학교 금속시스템공학과) ;
  • 김도형 (준결정재료 연구단/연세대학교 금속시스템공학과) ;
  • 김도향 (준결정재료 연구단/연세대학교 금속시스템공학과)
  • Published : 2007.09.20
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Abstract

In the present study, the high temperature mechanical properties and creep resistance of Mg-Zn-Y-Ca alloys has been investigated. The Mg-4Zn-0.8Y alloy consists of ${\alpha}$-Mg matrix and icosahedral quasicrystalline phase. Calcium addition into Mg-4n-0.8Y based alloy results in the formation of ${\tau}(Ca_{2}Mg_{6}Zn_{3})$ and $Mg_{2}Ca$ as the second solidification phases. Creep properties of the Mg-Zn-Y and Mg-Zn-Ca based alloys measured at applied stresses between 65 MPa and 85 MPa are significantly improved with adding calcium and yttrium, respectively. The improved creep resistance is due to the formation of thermally stable $Mg_{2}Ca$ phase.

Keywords

References

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