Superb strength-ductility synergy in a medium-entropy CoCrNi alloy via reinforced TRIP effect

C.X. Shi; X.H. Du; J.Y. Zhang; G.S. Duan; M.C. Yang; R.F. Zu; W.P. Li; T.H. Chou; B.L. Wu; J. Sun; J.C. Huang

doi:10.1016/j.jmrt.2022.07.060

Superb strength-ductility synergy in a medium-entropy CoCrNi alloy via reinforced TRIP effect

C.X. Shi, X.H. Du^*, J.Y. Zhang, G.S. Duan, M.C. Yang, R.F. Zu, W.P. Li, T.H. Chou, B.L. Wu, J. Sun, J.C. Huang

^*Corresponding author for this work

Department of Materials Science and Engineering

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

7 Citations (Scopus)

67 Downloads (CityUHK Scholars)

Abstract

In this study, a thermodynamically metastable medium-entropy Co₃₇Cr₃₄Ni₂₉ (at.%) alloy exhibiting superior strength-elongation synergy at ambient temperature was fabricated successfully via tailoring the processing route. It was discovered that after homogenizing and hot-rolling processes, the microstructure of the alloy was composed of two-type face-centered-cubic (FCC)-structure phases: Co-type FCC structure (metastable) phase and Ni-type FCC structure (stable) phase. During the tension process, the metastable Co-type FCC-structure phase has transformed gradually into Co-type hexagonal close-packed (HCP)-structure phase in a restrained environment characterized by the formation of networks of nano-spacing HCP phase bundle. This kind of transformation could provide intensified transformation-induced plasticity (TRIP) effect during the plastic straining process, thus, the alloy presented superior strength-elongation synergy (UTS × TE > 88 GPa%) compared with other ductile FCC-structure alloys with TRIP effect.

Original language	English
Pages (from-to)	104-113
Journal	Journal of Materials Research and Technology
Volume	20
Online published	16 Jul 2022
DOIs	https://doi.org/10.1016/j.jmrt.2022.07.060
Publication status	Published - Sept 2022

Research Keywords

Co-Cr-Ni medium-entropy alloy
Mechanical properties
Microstructure
Tension test
TRIP effect

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title = "Superb strength-ductility synergy in a medium-entropy CoCrNi alloy via reinforced TRIP effect",

abstract = "In this study, a thermodynamically metastable medium-entropy Co37Cr34Ni29 (at.%) alloy exhibiting superior strength-elongation synergy at ambient temperature was fabricated successfully via tailoring the processing route. It was discovered that after homogenizing and hot-rolling processes, the microstructure of the alloy was composed of two-type face-centered-cubic (FCC)-structure phases: Co-type FCC structure (metastable) phase and Ni-type FCC structure (stable) phase. During the tension process, the metastable Co-type FCC-structure phase has transformed gradually into Co-type hexagonal close-packed (HCP)-structure phase in a restrained environment characterized by the formation of networks of nano-spacing HCP phase bundle. This kind of transformation could provide intensified transformation-induced plasticity (TRIP) effect during the plastic straining process, thus, the alloy presented superior strength-elongation synergy (UTS × TE > 88 GPa%) compared with other ductile FCC-structure alloys with TRIP effect.",

keywords = "Co-Cr-Ni medium-entropy alloy, Mechanical properties, Microstructure, Tension test, TRIP effect",

author = "C.X. Shi and X.H. Du and J.Y. Zhang and G.S. Duan and M.C. Yang and R.F. Zu and W.P. Li and T.H. Chou and B.L. Wu and J. Sun and J.C. Huang",

year = "2022",

month = sep,

doi = "10.1016/j.jmrt.2022.07.060",

language = "English",

volume = "20",

pages = "104--113",

journal = "Journal of Materials Research and Technology",

issn = "2238-7854",

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TY - JOUR

T1 - Superb strength-ductility synergy in a medium-entropy CoCrNi alloy via reinforced TRIP effect

AU - Shi, C.X.

AU - Du, X.H.

AU - Zhang, J.Y.

AU - Duan, G.S.

AU - Yang, M.C.

AU - Zu, R.F.

AU - Li, W.P.

AU - Chou, T.H.

AU - Wu, B.L.

AU - Sun, J.

AU - Huang, J.C.

PY - 2022/9

Y1 - 2022/9

N2 - In this study, a thermodynamically metastable medium-entropy Co37Cr34Ni29 (at.%) alloy exhibiting superior strength-elongation synergy at ambient temperature was fabricated successfully via tailoring the processing route. It was discovered that after homogenizing and hot-rolling processes, the microstructure of the alloy was composed of two-type face-centered-cubic (FCC)-structure phases: Co-type FCC structure (metastable) phase and Ni-type FCC structure (stable) phase. During the tension process, the metastable Co-type FCC-structure phase has transformed gradually into Co-type hexagonal close-packed (HCP)-structure phase in a restrained environment characterized by the formation of networks of nano-spacing HCP phase bundle. This kind of transformation could provide intensified transformation-induced plasticity (TRIP) effect during the plastic straining process, thus, the alloy presented superior strength-elongation synergy (UTS × TE > 88 GPa%) compared with other ductile FCC-structure alloys with TRIP effect.

AB - In this study, a thermodynamically metastable medium-entropy Co37Cr34Ni29 (at.%) alloy exhibiting superior strength-elongation synergy at ambient temperature was fabricated successfully via tailoring the processing route. It was discovered that after homogenizing and hot-rolling processes, the microstructure of the alloy was composed of two-type face-centered-cubic (FCC)-structure phases: Co-type FCC structure (metastable) phase and Ni-type FCC structure (stable) phase. During the tension process, the metastable Co-type FCC-structure phase has transformed gradually into Co-type hexagonal close-packed (HCP)-structure phase in a restrained environment characterized by the formation of networks of nano-spacing HCP phase bundle. This kind of transformation could provide intensified transformation-induced plasticity (TRIP) effect during the plastic straining process, thus, the alloy presented superior strength-elongation synergy (UTS × TE > 88 GPa%) compared with other ductile FCC-structure alloys with TRIP effect.

KW - Co-Cr-Ni medium-entropy alloy

KW - Mechanical properties

KW - Microstructure

KW - Tension test

KW - TRIP effect

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U2 - 10.1016/j.jmrt.2022.07.060

DO - 10.1016/j.jmrt.2022.07.060

M3 - RGC 21 - Publication in refereed journal

SN - 2238-7854

VL - 20

SP - 104

EP - 113

JO - Journal of Materials Research and Technology

JF - Journal of Materials Research and Technology

ER -

Superb strength-ductility synergy in a medium-entropy CoCrNi alloy via reinforced TRIP effect

Abstract

Research Keywords

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ResFac: Inter-University 3D Atom Probe Tomography Unit

CRF: Three-dimensional (3D) Atom Probe Facility for Characterization of Advanced Materials Research at Atomic- and Nano-scales

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Superb strength-ductility synergy in a medium-entropy CoCrNi alloy via reinforced TRIP effect

Abstract

Research Keywords

Publisher's Copyright Statement

Access Output

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Permanent Link

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ResFac: Inter-University 3D Atom Probe Tomography Unit

CRF: Three-dimensional (3D) Atom Probe Facility for Characterization of Advanced Materials Research at Atomic- and Nano-scales

Cite this