Abstract
The glass-forming ability (GFA) of bulk metallic glasses (BMGs) has been analyzed on the basis of the thermodynamic parameters such as the specific heat difference ΔCpm between the undercooled liquid and corresponding equilibrium solid phase at the melting temperature Tm, entropy of fusion ΔSm, and the residual entropy ΔSR and characteristic temperatures, such as the Kauzmann temperature TK, glass transition temperature Tg, and the melting temperature Tm. The entire study is performed by analyzing the variation of critical cooling rate Rc with TK/Tm, ΔCpm/ΔSm, (Tg − TK)/Tm and ΔSR/ΔSm for a large number of BMGs. The variation of TK/Tm and ΔSR/ΔSm with ΔCpm/ΔSm has also been studied for BMGs. It has been found that materials having large ΔCpm/ΔSm exhibit large TK/Tm and such materials require low Rc for the glass formation. At the same time, it has also been found that materials having large TK/Tm exhibit low ΔSR/ΔSm and such materials need a low Rc for the glass formation. Attempt has also been made to correlate Rc with TK/Tm, ΔCpm/ΔSm, (Tg − TK)/Tm and ΔSR/ΔSm for BMGs.
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