A novel equiaxed eutectic high-entropy alloy with excellent mechanical properties at elevated temperatures

Liuliu Han; Xiandong Xu; Zhiming Li; Bin Liu; C. T. Liu; Yong Liu

doi:10.1080/21663831.2020.1772395

A novel equiaxed eutectic high-entropy alloy with excellent mechanical properties at elevated temperatures

Liuliu Han, Xiandong Xu, Zhiming Li, Bin Liu, C. T. Liu, Yong Liu^*

^*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

53 Citations (Scopus)

97 Downloads (CityUHK Scholars)

Abstract

A Co_25.1Cr_18.8Fe_23.3Ni_22.6Ta_8.5Al_1.7 (at. %) eutectic high-entropy alloy (EHEA) consisting of face-centered-cubic (FCC) and C14 Laves phases was produced by powder metallurgy. The EHEA shows an equiaxed morphology that is different from eutectic lamellar structure. Nanometer L1₂ phase (4–5 nm) further precipitates in FCC matrix. The microstructure is highly stable upon annealing at 1000°C for 100 h, which leads to attractive high-temperature strength. The fracture behaviour is observed to be modified by the equiaxed Laves phase, which contains microcracks induced by multiple dislocation slips. The diversified cracking modes help to relieve stress concentration and therefore enhance ductility at high temperatures.

Original language	English
Pages (from-to)	373-382
Journal	Materials Research Letters
Volume	8
Issue number	10
Online published	1 Jun 2020
DOIs	https://doi.org/10.1080/21663831.2020.1772395
Publication status	Published - 2 Oct 2020

Research Keywords

equiaxed structure
eutectic high-entropy alloys
high-temperature tensile properties
Nanoscale precipitation

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title = "A novel equiaxed eutectic high-entropy alloy with excellent mechanical properties at elevated temperatures",

abstract = "A Co25.1Cr18.8Fe23.3Ni22.6Ta8.5Al1.7 (at. %) eutectic high-entropy alloy (EHEA) consisting of face-centered-cubic (FCC) and C14 Laves phases was produced by powder metallurgy. The EHEA shows an equiaxed morphology that is different from eutectic lamellar structure. Nanometer L12 phase (4–5 nm) further precipitates in FCC matrix. The microstructure is highly stable upon annealing at 1000°C for 100 h, which leads to attractive high-temperature strength. The fracture behaviour is observed to be modified by the equiaxed Laves phase, which contains microcracks induced by multiple dislocation slips. The diversified cracking modes help to relieve stress concentration and therefore enhance ductility at high temperatures.",

keywords = "equiaxed structure, eutectic high-entropy alloys, high-temperature tensile properties, Nanoscale precipitation",

author = "Liuliu Han and Xiandong Xu and Zhiming Li and Bin Liu and Liu, {C. T.} and Yong Liu",

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T1 - A novel equiaxed eutectic high-entropy alloy with excellent mechanical properties at elevated temperatures

AU - Han, Liuliu

AU - Xu, Xiandong

AU - Li, Zhiming

AU - Liu, Bin

AU - Liu, C. T.

AU - Liu, Yong

PY - 2020/10/2

Y1 - 2020/10/2

N2 - A Co25.1Cr18.8Fe23.3Ni22.6Ta8.5Al1.7 (at. %) eutectic high-entropy alloy (EHEA) consisting of face-centered-cubic (FCC) and C14 Laves phases was produced by powder metallurgy. The EHEA shows an equiaxed morphology that is different from eutectic lamellar structure. Nanometer L12 phase (4–5 nm) further precipitates in FCC matrix. The microstructure is highly stable upon annealing at 1000°C for 100 h, which leads to attractive high-temperature strength. The fracture behaviour is observed to be modified by the equiaxed Laves phase, which contains microcracks induced by multiple dislocation slips. The diversified cracking modes help to relieve stress concentration and therefore enhance ductility at high temperatures.

AB - A Co25.1Cr18.8Fe23.3Ni22.6Ta8.5Al1.7 (at. %) eutectic high-entropy alloy (EHEA) consisting of face-centered-cubic (FCC) and C14 Laves phases was produced by powder metallurgy. The EHEA shows an equiaxed morphology that is different from eutectic lamellar structure. Nanometer L12 phase (4–5 nm) further precipitates in FCC matrix. The microstructure is highly stable upon annealing at 1000°C for 100 h, which leads to attractive high-temperature strength. The fracture behaviour is observed to be modified by the equiaxed Laves phase, which contains microcracks induced by multiple dislocation slips. The diversified cracking modes help to relieve stress concentration and therefore enhance ductility at high temperatures.

KW - equiaxed structure

KW - eutectic high-entropy alloys

KW - high-temperature tensile properties

KW - Nanoscale precipitation

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DO - 10.1080/21663831.2020.1772395

M3 - RGC 21 - Publication in refereed journal

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VL - 8

SP - 373

EP - 382

JO - Materials Research Letters

JF - Materials Research Letters

IS - 10

ER -

A novel equiaxed eutectic high-entropy alloy with excellent mechanical properties at elevated temperatures

Abstract

Research Keywords

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