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

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

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) furth...

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Bibliographic Details
Main Authors: Liuliu Han, Xiandong Xu, Zhiming Li, Bin Liu, C. T. Liu, Yong Liu
Format: Article
Language:English
Published: Taylor & Francis Group 2020-10-01
Series:Materials Research Letters
Subjects:
nanoscale precipitation
high-temperature tensile properties
eutectic high-entropy alloys
equiaxed structure
Online Access:http://dx.doi.org/10.1080/21663831.2020.1772395
Description
Summary: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.
ISSN:2166-3831

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