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Title: Investigation of the free volume change of Fe41Co7Cr15Mo14C15B6Y2 bulk metallic glass using the cyclic thermal dilatation test
Authors: Zeng, X
Hu, Q
Fu, MW 
Xie, SH
Keywords: Bulk metallic glass
Free volume
Thermal dilatation
Structural relaxation
Glass transition
Issue Date: 2012
Source: Journal of non-crystalline solids, 2012, v. 358, no. 18-19, p. 2682-2686 How to cite?
Journal: Journal of non-crystalline solids 
Abstract: In heating process, the free volume of bulk metallic glass (BMG) changes with temperature. This change, however, is too small to be directly investigated by thermal dilatation (DIL) test. In cyclic heating, the free volume change results in a difference between the thermal expansion during heating and reheating processes, i.e., Δ(δV(T)/V 0), which can be obtained by the cyclic DIL test. In this paper, the sample diameter and pre-annealing effect on the free volume change of Fe 41Co 7Cr 15Mo 14C 15B 6Y 2 BMG are investigated by the Δ(δV(T)/V 0) and ΔδV/ V0̄, where ΔδV/ V0̄ is the average value of Δ(δV(T)/V 0) in the low temperature range and represents the total free volume released in the cyclic DIL test. The as-cast samples with a smaller diameter have a larger ΔδV/ V0̄. After pre-annealing below the glass transition temperature for 2 hours, a peak that is attributed to the free volume generation in glass transition process occurs in the Δ(δV(T,t a)/V 0) curve and becomes sharper as the pre-annealing time t a is prolonged. ΔδV( ta)/ V0̄ is fitted by a stretched exponential relaxation function with a characteristic relaxation time τ of 14194 ± 2808 s and a Kohlrausch exponent β kww of 0.34 ± 0.04. The β kww of Fe 41Co 7Cr 15Mo 14C 15B 6Y 2 BMG is markedly lower than that of Pd- and Zr-based BMGs, and deserves a further investigation.
ISSN: 0022-3093
DOI: 10.1016/j.jnoncrysol.2012.06.020
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