Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 788, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2020.139591
Keywords
Medium-entropy alloy; In-situ tensile test; Deformation twin; Strength; Crack resistance
Categories
Funding
- Shenzhen Science and Technology Innovation Committee [JCYJ20160401100358589, JCYJ20170413141157573]
- National Natural Science Foundation of China [51601147]
- Natural Science Foundation of Shaanxi Province [2017JQ5010]
- Fundamental Research Funds for the Central Universities [3102016OQD048, 3102017JC11001, 3102017JC01003]
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The recrystallized and pre-deformed CoCrNi medium-entropy alloy (MEA), introduced with high-density deformation twins, exhibits an unprecedented high yield strength up to 2.1 GPa. We found that the highly distorted deformation twins provide strong resistance to crack propagation and the activated dislocation motion accommodates the further plastic deformation. Our in situ tensile tests of pre-notched sample reveal that crack propagation through strain localization band eventually leads to fracture. This result offers new insights on design and processing of MEA for desired mechanical performance.
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