Superior strength-ductility combination of a Co-rich CoCrNiAlTi high-entropy alloy at room and cryogenic temperatures

X H Du; X F Huo; H T Chang; W P Li; G S Duan; J C Huang; B L Wu; N F Zou; L Zhang

doi:10.1088/2053-1591/ab7a64

Superior strength-ductility combination of a Co-rich CoCrNiAlTi high-entropy alloy at room and cryogenic temperatures

X H Du^*
, X F Huo
, H T Chang
, W P Li
, G S Duan
, J C Huang
, B L Wu
, N F Zou
, L Zhang

^*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

26 Citations (Scopus)

114 Downloads (CityUHK Scholars)

Abstract

In the present study, a Co-rich CoCrNi-AlTi high-entropy alloy was designed and fabricated by hot forging and 700 °C for 8 h annealing process. The microstructure of the resultant alloy was composed of three multicomponent-phases with the face-centered cubic (FCC) structure, hexagonal close-packed (HCP) structure and L1₂ structure, respectively. The alloy exhibited a remarkable combination of tensile yield strength (gigapascal scale) and plasticity (uniform strain over 30%) at both room and cryogenic temperatures. The cooperative operation of multiple mechanisms consisting of refined-grain strengthening, second-phase strengthening, precipitation strengthening, stacking faults and phase-transformation toughening was suggested to be responsible for the excellent mechanical response.

Original language	English
Article number	034001
Journal	Materials Research Express
Volume	7
Issue number	3
Online published	9 Mar 2020
DOIs	https://doi.org/10.1088/2053-1591/ab7a64
Publication status	Published - Mar 2020

Research Keywords

High-entropy alloys
Mechanical properties
Multiple-phase microstructure
Strengthening and toughening mechanisms

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abstract = "In the present study, a Co-rich CoCrNi-AlTi high-entropy alloy was designed and fabricated by hot forging and 700 °C for 8 h annealing process. The microstructure of the resultant alloy was composed of three multicomponent-phases with the face-centered cubic (FCC) structure, hexagonal close-packed (HCP) structure and L12 structure, respectively. The alloy exhibited a remarkable combination of tensile yield strength (gigapascal scale) and plasticity (uniform strain over 30\%) at both room and cryogenic temperatures. The cooperative operation of multiple mechanisms consisting of refined-grain strengthening, second-phase strengthening, precipitation strengthening, stacking faults and phase-transformation toughening was suggested to be responsible for the excellent mechanical response.",

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T1 - Superior strength-ductility combination of a Co-rich CoCrNiAlTi high-entropy alloy at room and cryogenic temperatures

AU - Du, X H

AU - Huo, X F

AU - Chang, H T

AU - Li, W P

AU - Duan, G S

AU - Huang, J C

AU - Wu, B L

AU - Zou, N F

AU - Zhang, L

PY - 2020/3

Y1 - 2020/3

N2 - In the present study, a Co-rich CoCrNi-AlTi high-entropy alloy was designed and fabricated by hot forging and 700 °C for 8 h annealing process. The microstructure of the resultant alloy was composed of three multicomponent-phases with the face-centered cubic (FCC) structure, hexagonal close-packed (HCP) structure and L12 structure, respectively. The alloy exhibited a remarkable combination of tensile yield strength (gigapascal scale) and plasticity (uniform strain over 30%) at both room and cryogenic temperatures. The cooperative operation of multiple mechanisms consisting of refined-grain strengthening, second-phase strengthening, precipitation strengthening, stacking faults and phase-transformation toughening was suggested to be responsible for the excellent mechanical response.

AB - In the present study, a Co-rich CoCrNi-AlTi high-entropy alloy was designed and fabricated by hot forging and 700 °C for 8 h annealing process. The microstructure of the resultant alloy was composed of three multicomponent-phases with the face-centered cubic (FCC) structure, hexagonal close-packed (HCP) structure and L12 structure, respectively. The alloy exhibited a remarkable combination of tensile yield strength (gigapascal scale) and plasticity (uniform strain over 30%) at both room and cryogenic temperatures. The cooperative operation of multiple mechanisms consisting of refined-grain strengthening, second-phase strengthening, precipitation strengthening, stacking faults and phase-transformation toughening was suggested to be responsible for the excellent mechanical response.

KW - High-entropy alloys

KW - Mechanical properties

KW - Multiple-phase microstructure

KW - Strengthening and toughening mechanisms

UR - https://www.scopus.com/pages/publications/85081959487

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U2 - 10.1088/2053-1591/ab7a64

DO - 10.1088/2053-1591/ab7a64

M3 - RGC 21 - Publication in refereed journal

SN - 2053-1591

VL - 7

JO - Materials Research Express

JF - Materials Research Express

IS - 3

M1 - 034001

ER -

Superior strength-ductility combination of a Co-rich CoCrNiAlTi high-entropy alloy at room and cryogenic temperatures

Abstract

Research Keywords

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