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Tian, Fuyang
Publications (1 of 1) Show all publications
Tian, F., Wang, Y. & Vitos, L. (2017). Impact of aluminum doping on the thermo-physical properties of refractory medium-entropy alloys. Journal of Applied Physics, 121(1), Article ID 015105.
Open this publication in new window or tab >>Impact of aluminum doping on the thermo-physical properties of refractory medium-entropy alloys
2017 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 121, no 1, article id 015105Article in journal (Refereed) Published
Abstract [en]

We investigate the elastic moduli, ideal tensile strength, and thermodynamic properties of TiVNb and AlTiVNb refractory medium-entropy alloys (HEAs) by using ab initio alloy theories: the coherent potential approximation (CPA), the special quasi-random supercell (SQS), and a 432-atom supercell (SC). We find that with increasing number of alloy components, the SQS elastic constants become sensitive to the supercell size. The predicted elastic moduli are consistent with the available experiments. Aluminum doping decreases the stability of the body centered cubic phase. The ideal tensile strength calculation indicates that adding equiatomic Al to TiVNb random solid solution increases the intrinsic strength (ideal strain increase from 9.6% to 11.8%) and decreases the intrinsic strength (from 9.6 to 5.7GPa). Based on the equation of states calculated by the CPA and SC methods, the thermodynamic properties obtained by the two ab initio methods are assessed. The L2(1) AlTiVNb (Ti-Al-V-Nb) alloy is predicted to be thermodynamically and dynamically stable with respect to the solid solution.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2017
National Category
Physical Sciences
urn:nbn:se:kth:diva-202436 (URN)10.1063/1.4973489 (DOI)000392839400042 ()2-s2.0-85008951918 (Scopus ID)

QC 20170306

Available from: 2017-03-06 Created: 2017-03-06 Last updated: 2020-01-30Bibliographically approved

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