Nano-graining a particle-strengthened high-entropy alloy

Nano-graining a particle-strengthened high-entropy alloy

The possibility of further enhancing the strength of a (CoCrFeNi)₉₄Ti₂Al₄ high-entropy alloy (HEA), which is already strengthened by Ni₃(Ti,Al) second-phase particles, by grain refinement through high-pressure torsion (HPT) is examined. Concomitant with nanograin formation, HPT was found to induce p...

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Bibliographic Details
Main Authors: Lee, Dong-Hyun, Park, Jeong-Min, Yang, Guanghui, He, Junyang, Lu, Zhaoping, Suh, Jin-Yoo, Kawasaki, Megumi, Ramamurty, Upadrasta, Jang, Jae-il
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2021
Subjects:
Engineering::Mechanical engineering
High-entropy Alloy
Particle Strengthening
Online Access:https://hdl.handle.net/10356/151737
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Institution: Nanyang Technological University
Language: English
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Summary:The possibility of further enhancing the strength of a (CoCrFeNi)₉₄Ti₂Al₄ high-entropy alloy (HEA), which is already strengthened by Ni₃(Ti,Al) second-phase particles, by grain refinement through high-pressure torsion (HPT) is examined. Concomitant with nanograin formation, HPT was found to induce particle dissolution and structural transformation of the remnant particles. Nanoindentation experiments of nanocrystalline HEA, with and without particles in the pre-HPT microstructure, suggests that grain boundary strengthening is the dominant strengthening mechanism.

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