Journal of Korea Foundry Society (한국주조공학회지)

Korea Foundry Society (한국주조공학회)
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Glass Forming Ability and Characteristic Evaluation in Ca-Mg-Zn Alloy System

Ca-Ma-Zn 합금계에서 비정질 형성능 및 특성 평가

  • Park, Eun-Soo (Center for Non-crystalline Materials, Department of Metallurgical Engineering, Yonsei University) ;
  • Kim, Won-Tae (Division of Applied Science, Cheongju University) ;
  • Kim, Do-Hyang (Center for Non-crystalline Materials, Department of Metallurgical Engineering, Yonsei University)
  • 박은수 (연세대학교 신소재공학과, 준결정재료연구단) ;
  • 김원태 (청주대학교 응용과학부) ;
  • 김도향 (연세대학교 신소재공학과, 준결정재료연구단)
  • Published : 2006.04.20
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Abstract

The effect of alloy composition on the glass forming ability (GFA) of the Ca-rich Ca-Mg-Zn alloys has been investigated in $Ca_{65}Mg_{5+x}Zn_{30-x}$ and $Ca_{55+x}Mg_{15}Zn_{30-x}$ (x=0, 5, 10, 15, 20) alloys. In a wide composition range of 15-25% Zn and 10-20% Mg bulk metallic glass (BMG) samples with the diameter larger than 6 mm are fabricated by conventional copper mold casting method in air atmosphere. Among the alloys investigated, the $Ca_{65}Mg_{15}Zn_{20}$ alloy exhibits the highest GFA enabling to form BMG sample with the diameter of at least 15 mm. The crystalline phase formed during solidification of $Ca_{65}Mg_{15}Zn_{20}$ ($D_{max}=15\;mm$) could be identified as a mixture of $Ca_3Zn$ and $CaMg_2$ cause by the redistribution of the constituent elements on long-range scale. The compressive fracture strength and fracture elongation of the $Ca_{65}Mg_{15}Zn_{20}$ BMG are 602 MPa and 2.08% respectively. The ${\sigma}$ parameter which has been recently proposed for evaluating GFA exhibits better correlation with GFA of Ca-Mg-Zn alloys than other parameters suggested so far such as ${\Delta}T_x$, $T_{rg}$, K, ${\gamma}$, and ${\Delta}T^*$ parameters.

Keywords

References

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