Alloying strongly influences the structure, dynamics, and glass forming ability of metallic supercooled liquids

Cheng, Y. Q.; Ma, E.; Sheng, H. W.
September 2008
Applied Physics Letters;9/15/2008, Vol. 93 Issue 11, p111913
Academic Journal
The addition of a relatively small amount of alloying element(s) can induce major changes in the viscosity, fragility, and glass forming ability of supercooled liquids. A microscopic understanding of this behavior from the structural perspective has been elusive. Through comparisons between Cu–Zr–Al and Cu–Zr supercooled liquids, here we demonstrate the strong effects of Al alloying on the atomic-scale structure, in particular, the evolution of icosahedral local motifs, as well as the resulting dramatic slowing down of relaxation dynamics. The composition-structure-dynamics relationship uncovered for realistic bulk metallic glass forming liquids is important for understanding the glass transition and glass forming ability.


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