Nano-graining a particle-strengthened high-entropy alloy

Lee, Dong-Hyun; Park, Jeong-Min; Yang, Guanghui; He, Junyang; Lu, Zhaoping; Suh, Jin-Yoo; Kawasaki, Megumi; Ramamurty, Upadrasta; Jang, Jae-il

doi:10.1016/j.scriptamat.2018.12.033

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Nano-graining a particle-strengthened high-entropy alloy

Lee, Dong-Hyun;
Park, Jeong-Min;
Yang, Guanghui;
He, Junyang;
Lu, Zhaoping;
... Jang, Jae-il;
외 3명

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44

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47

초록

The possibility of further enhancing the strength of a (CoCrFeNi)(94)Ti2Al4 high-entropy alloy (HEA), which is already strengthened by Ni-3(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.

키워드

High-entropy alloy; Particle strengthening; Grain boundary strengthening; High-pressure torsion; Nanoindentation; COARSE 2ND-PHASE PARTICLES; SEVERE PLASTIC-DEFORMATION; HALL-PETCH RELATIONSHIP; MECHANICAL-PROPERTIES; ACTIVATION VOLUME; RATE SENSITIVITY; PHASE-STABILITY; NANOCRYSTALLINE; BEHAVIOR; MICROSTRUCTURE

제목: Nano-graining a particle-strengthened high-entropy alloy

저자: Lee, Dong-Hyun; Park, Jeong-Min; Yang, Guanghui; He, Junyang; Lu, Zhaoping; Suh, Jin-Yoo; Kawasaki, Megumi; Ramamurty, Upadrasta; Jang, Jae-il

DOI: 10.1016/j.scriptamat.2018.12.033

발행일: 2019-04

유형: Article

저널명: Scripta Materialia

권: 163

페이지: 24 ~ 28