Effect of alloying elements on the crystallization kinetics of Mg–Cu–(Y, Gd) bulk amorphous alloys

✍ Scribed by Geun Tae Bae; Sang Bok Lee; Nack J. Kim

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 328 KB
• Volume: 449-451
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2006.02.396

✦ Synopsis

In the present study, the effect of alloying elements on the crystallization kinetics of the Mg-Cu-(Y, Gd) bulk amorphous alloys has been investigated using thermal analysis (DTA) and EXAFS. The calculated CCT diagrams show that Mg 65 Cu 25 Gd 10 alloy has a much lower critical cooling rate (i.e., higher glass forming ability) than Mg 65 Cu 25 Y 10 alloy. Isothermal annealing studies of the alloys also show that Mg 65 Cu 25 Gd 10 alloy has a higher resistance to crystallization during annealing than Mg 65 Cu 25 Y 10 alloy. Difference in the glass forming abilities between Mg 65 Cu 25 Gd 10 and Mg 65 Cu 25 Y 10 alloys has been explained by the differences in the effective atomic sizes in amorphous state. It has also been shown that there are different local atomic configuration changes during annealing between Mg 65 Cu 25 Gd 10 and Mg 65 Cu 25 Y 10 alloys, which are related to the glass stability of these alloys.