[논문]Fine-tuning of mechanical properties in V10Cr15Mn5Fe35Co10Ni25 high-entropy alloy through high-pressure torsion and annealing

Asghari-Rad, Peyman; Sathiyamoorthi, Praveen; Thi-Cam Nguyen, Nhung; Bae, Jae Wung; Shahmir, Hamed; Kim, Hyoung Seop

doi:10.1016/j.msea.2019.138604

[해외논문] Fine-tuning of mechanical properties in V10Cr15Mn5Fe35Co10Ni25 high-entropy alloy through high-pressure torsion and annealing

Materials science & engineering. properties, microstructure and processing. A, Structural materials, v.771, 2020년, pp.138604 -

Asghari-Rad, Peyman (Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH)) , Sathiyamoorthi, Praveen (Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH)) , Thi-Cam Nguyen, Nhung (Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH)) , Bae, Jae Wung (Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH)) , Shahmir, Hamed (Department of Materials Science and Engineering, University of Sheffield) , Kim, Hyoung Seop (Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH))

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Abstract A V10Cr15Mn5Fe35Co10Ni25 (at%) high-entropy alloy (HEA) was subjected to high-pressure torsion (HPT) and subsequently annealed under different conditions to study its microstructural evolution and mechanical properties. The HPT-processed sample consisted of a nanocrystalline structure with an average grain size of 30 nm. Annealing at 600 °C for 2 min led to annealing induced hardening because of the formation of sigma phase, whereas samples annealed at higher temperatures showed a monotonous decrease in hardness because of dislocation recovery and grain growth. The average number of geometrically necessary dislocations decreased with increase in the temperature and duration time, indicating recovery of HPT-induced dislocations. Tensile properties indicated that the yield strength and ductility are notably influenced by the microstructure after annealing. The post-HPT annealing at 700 °C for 10 min resulted in an outstanding synergy of high tensile strength (~1.54 GPa) and good elongation-to-failure (~11%).

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[해외논문] Fine-tuning of mechanical properties in V10Cr15Mn5Fe35Co10Ni25 high-entropy alloy through high-pressure torsion and annealing

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[해외논문] Fine-tuning of mechanical properties in V10Cr15Mn5Fe35Co10Ni25 high-entropy alloy through high-pressure torsion and annealing

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