Attempt to depict glass forming ability of bulk metallic glasses using the criterion of the total relaxation time at the glass transition

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• 作者：Jing Guo ; Fang-Qiu Zu ; Zhi-Hao Chen ; Xian-Fen Li ; Yun Xi ; Rong-Rong Shen and YanZhang
• 关键词：Glass transition ; Metallic glasses
• 刊名：Journal of Non-Crystalline Solids
• 出版年：2006
• 出版时间：1 October 2006
• 年：2006
• 卷：352
• 期：36-37
• 页码：3859-3863
• 全文大小：149 K

文摘

The relationship between the total relaxation time at the glass transition and Glass Forming Ability (GFA) of Bulk Metallic Glasses (BMG) has been discussed. Subsequently is applied to estimate the GFA of Zr_52.5Al₁₀Ni_14.6Cu_17.9Ti₅ and Zr₅₇Al₁₀Ni_12.6Cu_15.4Nb₅ BMGs. The result indicates that the GFA of the former is greater than that of the latter, which is also demonstrated by the widely accepted criteria of both supercooled liquid region ΔT_x and reduced glass transition temperature T_rg. That testifies the relaxation time of glass transition () is feasible for depicting GFA of BMGs. As a criterion estimating GFA, could be easily obtained in practice, and then the occurrence of this criterion will promote exploring new bulk glassy composition. In addition, when and ΔT_x are calculated, the characteristic temperatures are determined by a electrical resistivity method besides DSC method. The values obtained from electrical resistivity method agree well with those from DSC method, which proves that the electrical resistivity method is applicable for determining the characteristic temperatures of BMGs.