A ductile high entropy alloy strengthened by nano sigma phase

Lu Zhang; Xiaofeng Huo; Anguo Wang; Xinghao Du; Li Zhang; Wanpeng Li; Naifu Zou; Gang Wan; Guosheng Duan; Baolin Wu

doi:10.1016/j.intermet.2020.106813

A ductile high entropy alloy strengthened by nano sigma phase

Lu Zhang^*
, Xiaofeng Huo
, Anguo Wang
, Xinghao Du
, Li Zhang
, Wanpeng Li
, Naifu Zou
, Gang Wan
, Guosheng Duan
, Baolin Wu

^*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

92 Citations (Scopus)

Abstract

A nanoscale sigma (σ) phase strengthened Co_34.5Cr₃₀Ni_26.5Al_5.4W_3.6 (at, %) high entropy alloy was prepared and showed high strength and ductility. Dual phase microstructure that comprises face-centered cubic (FCC) matrix and nanoscale σ particles was obtained after thermomechanical procedures. The excellent ductility is attributed to its high strain hardening exponent FCC matrix that strongly favors uniform deformation and prevents crack propagation. The alloy shows an extremely high strain hardening rate and strength due to the interactions between the σ particles, deformation twins and dislocations. The design concept of “deformation twins + nano particles” should be considered for the design of additional double-high (strength and ductility) FCC HEAs in future work.

Original language	English
Article number	106813
Journal	Intermetallics
Volume	122
Online published	29 Apr 2020
DOIs	https://doi.org/10.1016/j.intermet.2020.106813
Publication status	Published - Jul 2020

Research Keywords

Ductility
High entropy alloy
Intermetallic phase
Precipitation hardening
Strength
Work hardening

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10.1016/j.intermet.2020.106813

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@article{465955894b4d45f891077eab32109ca1,

title = "A ductile high entropy alloy strengthened by nano sigma phase",

abstract = "A nanoscale sigma (σ) phase strengthened Co34.5Cr30Ni26.5Al5.4W3.6 (at, \%) high entropy alloy was prepared and showed high strength and ductility. Dual phase microstructure that comprises face-centered cubic (FCC) matrix and nanoscale σ particles was obtained after thermomechanical procedures. The excellent ductility is attributed to its high strain hardening exponent FCC matrix that strongly favors uniform deformation and prevents crack propagation. The alloy shows an extremely high strain hardening rate and strength due to the interactions between the σ particles, deformation twins and dislocations. The design concept of “deformation twins + nano particles” should be considered for the design of additional double-high (strength and ductility) FCC HEAs in future work.",

keywords = "Ductility, High entropy alloy, Intermetallic phase, Precipitation hardening, Strength, Work hardening",

author = "Lu Zhang and Xiaofeng Huo and Anguo Wang and Xinghao Du and Li Zhang and Wanpeng Li and Naifu Zou and Gang Wan and Guosheng Duan and Baolin Wu",

year = "2020",

month = jul,

doi = "10.1016/j.intermet.2020.106813",

language = "English",

volume = "122",

journal = "Intermetallics",

issn = "0966-9795",

publisher = "Elsevier Ltd.",

}

TY - JOUR

T1 - A ductile high entropy alloy strengthened by nano sigma phase

AU - Zhang, Lu

AU - Huo, Xiaofeng

AU - Wang, Anguo

AU - Du, Xinghao

AU - Zhang, Li

AU - Li, Wanpeng

AU - Zou, Naifu

AU - Wan, Gang

AU - Duan, Guosheng

AU - Wu, Baolin

PY - 2020/7

Y1 - 2020/7

N2 - A nanoscale sigma (σ) phase strengthened Co34.5Cr30Ni26.5Al5.4W3.6 (at, %) high entropy alloy was prepared and showed high strength and ductility. Dual phase microstructure that comprises face-centered cubic (FCC) matrix and nanoscale σ particles was obtained after thermomechanical procedures. The excellent ductility is attributed to its high strain hardening exponent FCC matrix that strongly favors uniform deformation and prevents crack propagation. The alloy shows an extremely high strain hardening rate and strength due to the interactions between the σ particles, deformation twins and dislocations. The design concept of “deformation twins + nano particles” should be considered for the design of additional double-high (strength and ductility) FCC HEAs in future work.

AB - A nanoscale sigma (σ) phase strengthened Co34.5Cr30Ni26.5Al5.4W3.6 (at, %) high entropy alloy was prepared and showed high strength and ductility. Dual phase microstructure that comprises face-centered cubic (FCC) matrix and nanoscale σ particles was obtained after thermomechanical procedures. The excellent ductility is attributed to its high strain hardening exponent FCC matrix that strongly favors uniform deformation and prevents crack propagation. The alloy shows an extremely high strain hardening rate and strength due to the interactions between the σ particles, deformation twins and dislocations. The design concept of “deformation twins + nano particles” should be considered for the design of additional double-high (strength and ductility) FCC HEAs in future work.

KW - Ductility

KW - High entropy alloy

KW - Intermetallic phase

KW - Precipitation hardening

KW - Strength

KW - Work hardening

UR - https://www.scopus.com/pages/publications/85083558202

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85083558202&origin=recordpage

U2 - 10.1016/j.intermet.2020.106813

DO - 10.1016/j.intermet.2020.106813

M3 - RGC 21 - Publication in refereed journal

SN - 0966-9795

VL - 122

JO - Intermetallics

JF - Intermetallics

M1 - 106813

ER -

A ductile high entropy alloy strengthened by nano sigma phase

Abstract

Research Keywords

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