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Correction published on 9 August 2016, see Entropy 2016, 18(8), 289.

Open AccessArticle
Entropy 2016, 18(5), 189; doi:10.3390/e18050189

MoNbTaV Medium-Entropy Alloy

1
Laboratory of Applied Physics and Mechanics of Advanced Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2
National Energy Technology Laboratory, Albany, OR 97321, USA
3
AECOM, P.O. Box 1959, Albany, OR 97321, USA
4
Institute of Applied Mechanics and Biomedical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
*
Authors to whom correspondence should be addressed.
Academic Editor: An-Chou Yeh
Received: 17 April 2016 / Revised: 11 May 2016 / Accepted: 13 May 2016 / Published: 19 May 2016
(This article belongs to the Special Issue High-Entropy Alloys and High-Entropy-Related Materials)
View Full-Text   |   Download PDF [7432 KB, uploaded 9 August 2016]   |  

Abstract

Guided by CALPHAD (Calculation of Phase Diagrams) modeling, the refractory medium-entropy alloy MoNbTaV was synthesized by vacuum arc melting under a high-purity argon atmosphere. A body-centered cubic solid solution phase was experimentally confirmed in the as-cast ingot using X-ray diffraction and scanning electron microscopy. The measured lattice parameter of the alloy (3.208 Å) obeys the rule of mixtures (ROM), but the Vickers microhardness (4.95 GPa) and the yield strength (1.5 GPa) are about 4.5 and 4.6 times those estimated from the ROM, respectively. Using a simple model on solid solution strengthening predicts a yield strength of approximately 1.5 GPa. Thermodynamic analysis shows that the total entropy of the alloy is more than three times the configurational entropy at room temperature, and the entropy of mixing exhibits a small negative departure from ideal mixing. View Full-Text
Keywords: medium-entropy alloy; high-entropy alloy; enthalpy; entropy; lattice parameter; rule of mixture; mechanical properties; hardness; yield strength; solid solution strengthening medium-entropy alloy; high-entropy alloy; enthalpy; entropy; lattice parameter; rule of mixture; mechanical properties; hardness; yield strength; solid solution strengthening
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MDPI and ACS Style

Yao, H.; Qiao, J.-W.; Gao, M.C.; Hawk, J.A.; Ma, S.-G.; Zhou, H. MoNbTaV Medium-Entropy Alloy. Entropy 2016, 18, 189.

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