Journal
ENTROPY
Volume 18, Issue 5, Pages -Publisher
MDPI
DOI: 10.3390/e18050189
Keywords
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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Funding
- National Natural Science Foundation of China [51371122, 51501123]
- Program for the Innovative Talents of Higher Institutions of Shanxi
- Youth Natural Science Foundation of Shanxi Province, China [2015021005, 2015021006]
- State Key Lab of Advanced Metals and Materials [2015-Z07]
- Cross-Cutting Technologies Program at the National Energy Technology Laboratory (NETL)-Strategic Center for Coal
- RES contract [DE-FE-0004000]
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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 angstrom) 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.
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