Topological instability as a criterion for design and selection of aluminum-based glass-former alloys

Sá Lisboa, R. D.; Bolfarini, C.; Botta F., W. J.; Kiminami, C. S.
May 2005
Applied Physics Letters;5/23/2005, Vol. 86 Issue 21, p211904
Academic Journal
This letter proposes a criterion to quantitatively correlate chemical composition with crystallization behaviors of Al-based glass-former alloys. By extending to multicomponent systems the topological instability model of Egami and Waseda [J. Non-Cryst. Solids 64, 113 (1984)], we introduce a “lambda (λ) criterion” according to which amorphous alloys with λ>0.1 exhibit glassy behavior, whereas alloys with λ<0.1 are nanocrystalline. Nanoglassy alloys occur when λ≈0.1. A large number of experimental findings in the literature supports the λ criterion, rendering it a useful tool for the design and selection of glass-former systems and compositions.


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