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Entropy 2013, 15(9), 3810-3821; doi:10.3390/e15093810
Article

Entropies in Alloy Design for High-Entropy and Bulk Glassy Alloys

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Received: 19 July 2013; in revised form: 10 September 2013 / Accepted: 10 September 2013 / Published: 12 September 2013
(This article belongs to the Special Issue High Entropy Alloys)
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Abstract: High-entropy (H-E) alloys, bulk metallic glasses (BMGs) and high-entropy BMGs (HE-BMGs) were statistically analyzed with the help of a database of ternary amorphous alloys. Thermodynamic quantities corresponding to heat of mixing and atomic size differences were calculated as a function of composition of the multicomponent alloys. Actual calculations were performed for configurational entropy (Sconfig.) in defining the H-E alloys and mismatch entropy (Ss) normalized with Boltzmann constant (kB), together with mixing enthalpy (DHmix) based on Miedema’s empirical model and Delta parameter (d) as a corresponding parameter to Ss/kB. The comparison between DHmixd and DHmix–  diagrams for the ternary amorphous alloys revealed Ss/kB ~ (d /22)2. The zones S, S′ and B’s where H-E alloys with disordered solid solutions, ordered alloys and BMGs are plotted in the DHmixd diagram are correlated with the areas in the DHmixSs /kB diagram. The results provide mutual understandings among H-E alloys, BMGs and HE-BMGs.
Keywords: high-entropy alloy; bulk metallic glass; configurational entropy; mismatch entropy; atomic size difference; mixing enthalpy; alloy design high-entropy alloy; bulk metallic glass; configurational entropy; mismatch entropy; atomic size difference; mixing enthalpy; alloy design
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Takeuchi, A.; Amiya, K.; Wada, T.; Yubuta, K.; Zhang, W.; Makino, A. Entropies in Alloy Design for High-Entropy and Bulk Glassy Alloys. Entropy 2013, 15, 3810-3821.

AMA Style

Takeuchi A, Amiya K, Wada T, Yubuta K, Zhang W, Makino A. Entropies in Alloy Design for High-Entropy and Bulk Glassy Alloys. Entropy. 2013; 15(9):3810-3821.

Chicago/Turabian Style

Takeuchi, Akira; Amiya, Kenji; Wada, Takeshi; Yubuta, Kunio; Zhang, Wei; Makino, Akihiro. 2013. "Entropies in Alloy Design for High-Entropy and Bulk Glassy Alloys." Entropy 15, no. 9: 3810-3821.


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