Determination of accurate theoretical values for thermodynamic properties in bulk metallic glasses

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ID: 112732
2013
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Abstract
Deviation values of specific heat difference $$ \Updelta C_{\rm p},$$ Δ C p , the Gibbs free energy difference $$ \Updelta G , $$ Δ G , enthalpy difference $$ \Updelta H , $$ Δ H , and entropy difference $$ \Updelta S $$ Δ S between the supercooled liquid and corresponding crystalline phase produced by the linear, hyperbolic, and Dubey’s expressions of $$ \Updelta C_{\rm p}$$ Δ C p and the corresponding experimental values are determined for sixteen bulk metallic glasses (BMGs) from the glass transition temperature $$ T_{\text{g}} $$ T g to the melting temperature $$ T_{\text{m}}. $$ T m . The calculated values produced by the hyperbolic expression for $$\Updelta C_{\rm p}$$ Δ C p most closely approximate experimental values, indicating that the hyperbolic $$\Updelta C_{\rm p}$$ Δ C p expression can be considered universally applicable, compared to linear and Dubey’s expressions for $$ \Updelta C_{\rm p},$$ Δ C p , which are accurate only within a limited range of conditions. For instance, Dubey’s $$\Updelta C_{\rm p}$$ Δ C p expression provides a good approximation of actual experimental values within certain conditions (i.e., $$ \xi = \Updelta C_{\rm p}^{\rm g}/\Updelta C_{\rm p}^{\rm m}< 2 , $$ ξ = Δ C p g / Δ C p m < 2 , where $$\Updelta C_{\rm p}^{\rm g}$$ Δ C p g and $$\Updelta C_{\rm p}^{\rm m}$$ Δ C p m represent the specific heat difference at temperatures $$ T_{\text{g}} $$ T g and $$ T_{\text{m}} , $$ T m , respectively).
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Authors Pei-You Li;Gang Wang;Ding Ding;Jun Shen;Pei-You Li;Gang Wang;Ding Ding;Jun Shen;
Journal advances in manufacturing
Year 2013
DOI
doi:10.1007/s40436-013-0040-3
URL
https://link.springer.com/article/10.1007/s40436-013-0040-3
Keywords
manufacturing control Machines Tools Processes Robotics Mechatronics nanotechnology and microengineering

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