A thermodynamic approach towards glass-forming ability of amorphous metallic alloys

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• 作者：SONAL R PRAJAPATI ; SUPRIYA KASYAP ; ARUN PRATAP
• 关键词：Metallic glass ; Gibbs free energy ; critical size.
• 刊名：Bulletin of Materials Science
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：38
• 期：7
• 页码：1693-1698
• 全文大小：378 KB
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• 作者单位：SONAL R PRAJAPATI (1)
  SUPRIYA KASYAP (1)
  ARUN PRATAP (1)
  
  1. Condensed Matter Physics Laboratory, Applied Physics Department, Faculty of Technology and Engineering, The M. S. University of Baroda, Vadodara, 390001, India
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Engineering, general
  
• 出版者：Springer India
• ISSN：0973-7669

文摘

A quantitative measure of the stability of a glass as compared to its corresponding crystalline state can be obtained by calculating the thermodynamic parameters, such as the Gibbs free energy difference (ΔG), entropy difference (ΔS) and the enthalpy difference (ΔH) between the super-cooled liquid and the corresponding crystalline phase. ΔG is known as the driving force of crystallization. The driving force of crystallization (ΔG) provides very important information about the glass-forming ability (GFA) of metallic glasses (MGs). Lesser the driving force of crystallization more is the GFA. The ΔG varies linearly with the critical size (d _c). According to Battezzati and Garonne the parameter γ ( = ( 1−(ΔH _x /ΔH _m)/(1−(T _x /T _m))) in the expression for ΔG should be a constant (i.e., 0.8), but its uniqueness is not observed for all MGs. The thermal stability of various alloy compositions is studied by their undercooled liquid region (ΔT = T _x −T _g). Large ΔT _x implies greater stability against crystallization of the amorphous structure. Other GFA parameters are also calculated and correlated with critical size (d _c). Keywords Metallic glass Gibbs free energy critical size.