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Vol.38, No.7, 869 ~ 874, 2000

Title

Pesearch Paper / Transformations : Studies on Fabrication of Bulk Mg - Cu - Ag - Y Metallic Gless Alloy

박은수Eun Soo Park,강형구Hyung Gu Kang,김원태Won Tae Kim,김도향Do Hyang Kim

Abstract

We have studied the effect of Ag as a substituting element for Cu on class forming ability in Mg_(65)Cu_(25-x)Ag_xY_(10) alloy and the possibility of manufacturing new bulk Mg-based glass material with maximum thickness by the squeeze casting process. Ag was selected as a candidate element due to following reasons : 1) Atomic size difference between Ag and constituting elements is more than 10%; 2) Mixing enthalpies between Ag-Mg and Ag-Y are large; and 3) Ag and Cu belong to a same family in periodic table and number of valence electron of Ag is same as that of Cu. Mg_(65)Cu_(15)Ag_(10)Y_(10) alloy has improved glass forming ability, by partially substituting Cu with Ag in Mg_(65)Cu_(25)Y_(10) alloy. Injection casting produced bulk metallic glass of Mg_965)Cu_(15)Ag_(10)Y_(10) alloy having diameter up to 6 ㎜, which is larger than the maximum diameter of 4 ㎜ in Mg_(65)Cu_(25)Y_(10) alloy. Squeeze casting enabled to produce larger bulk metallic glass with Mg_(65)Cu_(15)Ag_(10)Y_(10) alloy up to 10 ㎜ in diameter due to rapid heat extraction and undercooling of the liquid alloy by applying pressure during solidification.

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