MoNbTaV Medium-Entropy Alloy
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. 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.
- Authors:
-
- 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)
- Publication Date:
- Research Org.:
- National Energy Technology Lab. (NETL), Albany, OR (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1338295
- Report Number(s):
- A-CONTR-PUB-050
Journal ID: ISSN 1099-4300; ENTRFG; PII: e18050189
- Grant/Contract Number:
- FE0004000
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Entropy
- Additional Journal Information:
- Journal Volume: 18; Journal Issue: 12; Journal ID: ISSN 1099-4300
- Publisher:
- MDPI
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; medium-entropy alloy; high-entropy alloy; enthalpy; entropy; lattice parameter; rule of mixture; mechanical properties; hardness; yield strength; solid solution strengthening
Citation Formats
Yao, Hongwei, Qiao, Jun -Wei, Gao, Michael, Hawk, Jeffrey, Ma, Sheng -Guo, and Zhou, Hefeng. MoNbTaV Medium-Entropy Alloy. United States: N. p., 2016.
Web. doi:10.3390/e18050189.
Yao, Hongwei, Qiao, Jun -Wei, Gao, Michael, Hawk, Jeffrey, Ma, Sheng -Guo, & Zhou, Hefeng. MoNbTaV Medium-Entropy Alloy. United States. https://doi.org/10.3390/e18050189
Yao, Hongwei, Qiao, Jun -Wei, Gao, Michael, Hawk, Jeffrey, Ma, Sheng -Guo, and Zhou, Hefeng. Thu .
"MoNbTaV Medium-Entropy Alloy". United States. https://doi.org/10.3390/e18050189. https://www.osti.gov/servlets/purl/1338295.
@article{osti_1338295,
title = {MoNbTaV Medium-Entropy Alloy},
author = {Yao, Hongwei and Qiao, Jun -Wei and Gao, Michael and Hawk, Jeffrey and Ma, Sheng -Guo and Zhou, Hefeng},
abstractNote = {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.},
doi = {10.3390/e18050189},
journal = {Entropy},
number = 12,
volume = 18,
place = {United States},
year = {Thu May 19 00:00:00 EDT 2016},
month = {Thu May 19 00:00:00 EDT 2016}
}
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