Journal of Korea Foundry Society (한국주조공학회지)

Korea Foundry Society (한국주조공학회)
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The Effect of Ca Addition on Creep Behavior of As-cast Mg-8.0Zn-1.6Y Alloys with Icosahedral Phase

Icosahedral 상을 갖는 Mg-8Zn-1.6Y 합금의 크리프 거동에 미치는 Ca 첨가 영향

  • Jung, Young-Gil (Advanced Materials and Process R&D Department, Korea Institute of Industrial Technology) ;
  • Yang, Wonseok (Advanced Materials and Process R&D Department, Korea Institute of Industrial Technology) ;
  • Kim, Shae K. (Advanced Materials and Process R&D Department, Korea Institute of Industrial Technology) ;
  • Lim, Hyunkyu (Advanced Materials and Process R&D Department, Korea Institute of Industrial Technology) ;
  • Oh, Gun-Young (Materials & Production engineering Research Institute, LG Electronics) ;
  • Kim, Youngkyun (Advanced Materials & Processing Center, Institute of Advanced Engineering) ;
  • Kim, Do Hyang (Dept. of Metallurgical Engineering, Yonsei University)
  • 정영길 (한국생산기술연구원 융합소재공정연구부문) ;
  • 양원석 (한국생산기술연구원 융합소재공정연구부문) ;
  • 김세광 (한국생산기술연구원 융합소재공정연구부문) ;
  • 임현규 (한국생산기술연구원 융합소재공정연구부문) ;
  • 오건영 (LG전자 생산기술원) ;
  • 김영균 (고등기술연구원 신소재공정센터) ;
  • 김도향 (연세대학교 신소재공학과)
  • Received : 2019.12.26
  • Accepted : 2020.02.25
  • Published : 2020.04.30
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Abstract

The high-temperature stability of Mg-8.0Zn-1.6Y (wt.%) alloys upon the addition of Ca has been investigated by characterizing the ignition temperature, microstructure, tensile and creep properties. The ignition temperature increases with an increase in the Ca content, indicating that an addition of Ca enhances the ignition resistance of the Mg-Zn-Y alloy. The as-cast microstructures of all tested alloys mainly consisted of the dendritic α-Mg matrix and I-phase (Mg3Zn6Y) at the grain boundaries. In the Ca-added Mg-8.0Zn-1.6Y alloys, the Ca2Mg6Zn3 phase forms, with this phase fraction increasing with an increase in the Ca contents. However, a high volume fraction of the Ca2Mg6Zn3 phase rather deteriorates the mechanical properties. Therefore, a moderate amount of Ca element in Mg-8.0Zn-1.6Y alloys is effective for improving the tensile and creep properties of the Mg-Zn-Y alloy. The Mg-8.0Zn-1.6Y-0.3Ca alloy exhibits the highest tensile strength and the lowest creep strain among the alloys investigated in the present study. The creep resistance of Mg-Zn-Y-Ca alloys depends on the selection of the secondary solidification phase; i.e., when Ca2Mg6Zn3 forms in an alloy containing a high level of Ca, the creep resistance deteriorates because Ca2Mg6Zn3 is less stable than the I-phase at a high temperature.

Keywords

References

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