Ultra-high tensile strength nanocrystalline CoCrNi equi-atomic medium entropy alloy processed by high-pressure torsion

A nanocrystalline CoCrNi alloy of ~50 nm grain size with the ultra-high ultimate tensile strength of ~2.2 GPa and fracture strain of ~9% was fabricated using high-pressure torsion. The presence of high density of nano-twins, stacking faults, dislocations, and nano-grains is attributed to the superio...

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Published inMaterials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 735; pp. 394 - 397
Main Authors Praveen, S., Bae, Jae Wung, Asghari-Rad, Peyman, Park, Jeong Min, Kim, Hyoung Seop
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier B.V 26.09.2018
Elsevier BV
Subjects
Alloys
Dislocation density
Entropy
High entropy alloys
High-pressure torsion
Mechanical properties
Medium entropy alloys
Nano-grains
Nano-twins
Nanocrystals
Stacking faults
Tensile strength
Torsion
Ultimate tensile strength
Ultra-high tensile strength
High entropy alloys
Ultra-high tensile strength
Nano-twins
Nano-grains
High-pressure torsion
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Summary:A nanocrystalline CoCrNi alloy of ~50 nm grain size with the ultra-high ultimate tensile strength of ~2.2 GPa and fracture strain of ~9% was fabricated using high-pressure torsion. The presence of high density of nano-twins, stacking faults, dislocations, and nano-grains is attributed to the superior mechanical properties.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2018.08.079