Journal of Korea Foundry Society (한국주조공학회지)

Korea Foundry Society (한국주조공학회)
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Mechanical Properties and Microstructure of Mg-Zn-(Mn)-Ca Alloys

Mg-Zn-(Mn)-Ca 합금의 미세조직 및 기계적성질

  • Eom, Jeong-Pil (Research Center for Aircraft Parts Technology, Dept. of Metallurgical & Materials Eng., Gyeongsang National Univ.) ;
  • Cha, Dong-Deuk (Research Center for Aircraft Parts Technology, Dept. of Metallurgical & Materials Eng., Gyeongsang National Univ.) ;
  • Lim, Su-Guen (Research Center for Aircraft Parts Technology, Dept. of Metallurgical & Materials Eng., Gyeongsang National Univ.) ;
  • Hur, Bo-Young (Research Center for Aircraft Parts Technology, Dept. of Metallurgical & Materials Eng., Gyeongsang National Univ.)
  • 엄정필 (경상대학교 금속재료공학과, 항공기부품기술연구센터) ;
  • 차동득 (경상대학교 금속재료공학과, 항공기부품기술연구센터) ;
  • 임수근 (경상대학교 금속재료공학과, 항공기부품기술연구센터) ;
  • 허보영 (경상대학교 금속재료공학과, 항공기부품기술연구센터)
  • Published : 1997.12.20
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Abstract

The microstructure and tensile properties of Mg-Zn-Ca and Mg-Zn-Mn-Ca alloys have been investigated. The alloys were obtained by melting in a low carbon crucible coated with boron nitride under an Ar gas atmosphere to prevent oxidation and combustion. The Mg alloy melt was cast into the metallic mold at room temperature, and cooling part was located at the bottom of mold. The phase formed during solidification of the Mg-Zn-(Mn) alloys containing 0.5%Ca is $Ca_2Mg_6Zn_3$. The yield strength and ultimate tensile strength of the alloys increased with increasing Zn content, but the ductility did not change with increasing Zn content. The addition of Mn improves the yield strength and ultimate tensile strength of the alloys, but the ductility did not change. Tensile fracture of the alloys revealed brittle failure, with cracking along the $Ca_2Mg_6Zn_3$ phase. The variation of stress with strain obeyed the relationship of the ${\sigma}=K{\varepsilon}^n$.

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