New model of Gibbs free energy difference for bulk metallic glasses

✍ Scribed by An-Hui Cai; Hui Wang; Xiao-Song Li; Hua Chen; Yong Zhou; Zheng-Su Wan

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 179 KB
• Volume: 435-436
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2006.07.021

✦ Synopsis

A newly derived expression for estimation of Gibbs free energy difference ( G) between the crystalline and under-cooled liquid of glass-forming alloys have been utilized to obtain theoretical G for a variety of alloy systems. It gives better results nearly overlapping with the experimental values over entire under-cooling region for all alloy systems studied in this paper. However, the theoretical results given by other expressions deviate from the experimental values even in small under-cooling region except that the expressions proposed by Thompson and Spaepen and Lad et al. give a close estimation to the experimental G in the temperature region of 680-937 K for Zr 41.2 Ti 13.8 Ni 10 Cu 12.5 Be 22.5 and 450-662 K for La 55 Cu 10 Ni 10 Al 25 , respectively. In addition, the results in present work will provide us with the evidence of the choice of the α values for different metallic glasses.