Strengthening of a CrMnFeCoNi high-entropy alloy by carbide precipitation

N. Gao; D. H. Lu; Y. Y. Zhao; X. W. Liu; G. H. Liu; Y. Wu; G. Liu; Z. T. Fan; Z. P. Lu; E. P. George

doi:10.1016/j.jallcom.2019.04.121

Strengthening of a CrMnFeCoNi high-entropy alloy by carbide precipitation

N. Gao
, D. H. Lu
, Y. Y. Zhao
, X. W. Liu
, G. H. Liu
, Y. Wu
, G. Liu
, Z. T. Fan
, Z. P. Lu
, E. P. George

Huazhong University of Science and Technology
University of Tennessee
University of Science and Technology Beijing
Northeastern University China
Xi'an University of Technology
Oak Ridge National Laboratory

Research output: Contribution to journal › Article › peer-review

135 Scopus citations

Abstract

The equiatomic CrMnFeCoNi high-entropy alloy (HEA) exhibits outstanding toughness and excellent strength-ductility combination at cryogenic temperatures. However, its strength is relatively low at room temperature. In order to strengthen this HEA, microalloying additions of 0.8 at.% Nb and C were made and its properties and microstructure evaluated. It was found that the microalloying resulted in the formation of carbide precipitates and a reduction of the grain size to ∼2.6 μm. As a result, the room-temperature tensile yield strength (732 MPa) of the microalloyed HEA is roughly double that of the base HEA (with a concomitant increase in the ultimate strength) while its ductility is maintained at a relatively high level (elongation to fracture of ∼32%). The strengthening is due to precipitation hardening from the nanoscale carbide particles and grain refinement.

Original language	English
Pages (from-to)	1028-1035
Number of pages	8
Journal	Journal of Alloys and Compounds
Volume	792
DOIs	https://doi.org/10.1016/j.jallcom.2019.04.121
State	Published - 5 Jul 2019
Externally published	Yes

Keywords

Carbide
High-entropy alloy
Precipitation
Strengthening
Tensile property

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10.1016/j.jallcom.2019.04.121

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@article{1bb2a67616734e0bb37b0a7f6b80377f,

title = "Strengthening of a CrMnFeCoNi high-entropy alloy by carbide precipitation",

abstract = "The equiatomic CrMnFeCoNi high-entropy alloy (HEA) exhibits outstanding toughness and excellent strength-ductility combination at cryogenic temperatures. However, its strength is relatively low at room temperature. In order to strengthen this HEA, microalloying additions of 0.8 at.\% Nb and C were made and its properties and microstructure evaluated. It was found that the microalloying resulted in the formation of carbide precipitates and a reduction of the grain size to ∼2.6 μm. As a result, the room-temperature tensile yield strength (732 MPa) of the microalloyed HEA is roughly double that of the base HEA (with a concomitant increase in the ultimate strength) while its ductility is maintained at a relatively high level (elongation to fracture of ∼32\%). The strengthening is due to precipitation hardening from the nanoscale carbide particles and grain refinement.",

keywords = "Carbide, High-entropy alloy, Precipitation, Strengthening, Tensile property",

author = "N. Gao and Lu, \{D. H.\} and Zhao, \{Y. Y.\} and Liu, \{X. W.\} and Liu, \{G. H.\} and Y. Wu and G. Liu and Fan, \{Z. T.\} and Lu, \{Z. P.\} and George, \{E. P.\}",

note = "Publisher Copyright: {\textcopyright} 2019",

year = "2019",

month = jul,

day = "5",

doi = "10.1016/j.jallcom.2019.04.121",

language = "英语",

volume = "792",

pages = "1028--1035",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Strengthening of a CrMnFeCoNi high-entropy alloy by carbide precipitation

AU - Gao, N.

AU - Lu, D. H.

AU - Zhao, Y. Y.

AU - Liu, X. W.

AU - Liu, G. H.

AU - Wu, Y.

AU - Liu, G.

AU - Fan, Z. T.

AU - Lu, Z. P.

AU - George, E. P.

PY - 2019/7/5

Y1 - 2019/7/5

N2 - The equiatomic CrMnFeCoNi high-entropy alloy (HEA) exhibits outstanding toughness and excellent strength-ductility combination at cryogenic temperatures. However, its strength is relatively low at room temperature. In order to strengthen this HEA, microalloying additions of 0.8 at.% Nb and C were made and its properties and microstructure evaluated. It was found that the microalloying resulted in the formation of carbide precipitates and a reduction of the grain size to ∼2.6 μm. As a result, the room-temperature tensile yield strength (732 MPa) of the microalloyed HEA is roughly double that of the base HEA (with a concomitant increase in the ultimate strength) while its ductility is maintained at a relatively high level (elongation to fracture of ∼32%). The strengthening is due to precipitation hardening from the nanoscale carbide particles and grain refinement.

AB - The equiatomic CrMnFeCoNi high-entropy alloy (HEA) exhibits outstanding toughness and excellent strength-ductility combination at cryogenic temperatures. However, its strength is relatively low at room temperature. In order to strengthen this HEA, microalloying additions of 0.8 at.% Nb and C were made and its properties and microstructure evaluated. It was found that the microalloying resulted in the formation of carbide precipitates and a reduction of the grain size to ∼2.6 μm. As a result, the room-temperature tensile yield strength (732 MPa) of the microalloyed HEA is roughly double that of the base HEA (with a concomitant increase in the ultimate strength) while its ductility is maintained at a relatively high level (elongation to fracture of ∼32%). The strengthening is due to precipitation hardening from the nanoscale carbide particles and grain refinement.

KW - Carbide

KW - High-entropy alloy

KW - Precipitation

KW - Strengthening

KW - Tensile property

UR - https://www.scopus.com/pages/publications/85064399139

U2 - 10.1016/j.jallcom.2019.04.121

DO - 10.1016/j.jallcom.2019.04.121

M3 - 文章

AN - SCOPUS:85064399139

SN - 0925-8388

VL - 792

SP - 1028

EP - 1035

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

ER -

Strengthening of a CrMnFeCoNi high-entropy alloy by carbide precipitation

Abstract

Keywords

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