MoNbTaV Medium-Entropy Alloy

Yao, Hongwei; Qiao, Jun -Wei; Gao, Michael; Hawk, Jeffrey; Ma, Sheng -Guo; Zhou, Hefeng

doi:10.3390/e18050189

Title: MoNbTaV Medium-Entropy Alloy

Journal Article · Thu May 19 00:00:00 EDT 2016 · Entropy

DOI:https://doi.org/10.3390/e18050189· OSTI ID:1338295

Yao, Hongwei ^[1]; Qiao, Jun -Wei ^[1]; Gao, Michael ^[2]; Hawk, Jeffrey ^[3]; Ma, Sheng -Guo ^[1]; Zhou, Hefeng ^[1]

Taiyuan Univ. of Technology, Taiyuan (China)
National Energy Technology Lab. (NETL), Albany, OR (United States); AECOM, Albany, OR (United States)
National Energy Technology Lab. (NETL), Albany, OR (United States)

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. In conclusion, 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.

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Research Organization:: National Energy Technology Lab. (NETL), Albany, OR (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FE0004000

OSTI ID:: 1338295

Report Number(s):: A-CONTR-PUB-050; ENTRFG; PII: e18050189

Journal Information:: Entropy, Vol. 18, Issue 12; ISSN 1099-4300

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 79 works

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Microstructure and Mechanical Properties of (TiZrHf)50(NiCoCu)50 High Entropy Alloys Chen, Chih-Hsuan; Chen, Yue-Jin; Shen, Jia-Jyun Metals and Materials International https://doi.org/10.1007/s12540-019-00383-3	journal	July 2019
Computational modeling of high-entropy alloys: Structures, thermodynamics and elasticity Gao, Michael C.; Gao, Pan; Hawk, Jeffrey A. Journal of Materials Research, Vol. 32, Issue 19 https://doi.org/10.1557/jmr.2017.366	journal	October 2017
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Effect of Mn Addition on the Microstructures and Mechanical Properties of CoCrFeNiPd High Entropy Alloy Tan, Yiming; Li, Jinshan; Wang, Jun Entropy, Vol. 21, Issue 3 https://doi.org/10.3390/e21030288	journal	March 2019
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36 MATERIALS SCIENCE
medium-entropy alloy
high-entropy alloy
enthalpy
entropy
lattice parameter
rule of mixture
mechanical properties
hardness
yield strength
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Title: MoNbTaV Medium-Entropy Alloy

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