Correlation between dynamic flow and thermodynamic glass transition in metallic glasses

Ke, H. B.; Wen, P.; Zhao, D. Q.; Wang, W. H.
June 2010
Applied Physics Letters;6/21/2010, Vol. 96 Issue 25, p251902
Academic Journal
We report the values of steps of heat capacity (ΔCp) during the glass transition in a variety of metallic glasses (MGs). It is found that ΔCp is around 13.69 J mol-1 K-1 and almost invariable for the MGs. Based on the Eyring’s theory [N. Hirai and H. Eyring, J. Polym. Sci. 37, 51 (1959)], the phenomenon corresponds to a critical reduced free volume value. This exhibits that the glass transition takes place when the reduced free volume approaches to ∼2.35% in the MG systems. The value, consistent with that of the yielding of MGs, confirms that temperature and stress are equivalent for fluidizing MGs. Our results give an implication to understanding the glass transition in MGs as a Lindemann-type melting behavior [F. A. Lindemann, Z. Phys. 11, 609 (1910)].


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