| Title |
Pesearch Paper / Transformations : Studies on Fabrication of Bulk Mg - Cu - Ag - Y Metallic Gless Alloy |
| Authors |
박은수(Eun Soo Park),강형구(Hyung Gu Kang),김원태(Won Tae Kim),김도향(Do Hyang Kim) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| 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. |