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

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Liuliu Han
  • Xiandong Xu
  • Zhiming Li
  • Bin Liu
  • Yong Liu

Detail(s)

Original languageEnglish
Pages (from-to)373-382
Journal / PublicationMaterials Research Letters
Volume8
Issue number10
Online published1 Jun 2020
Publication statusPublished - 2 Oct 2020

Link(s)

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.

Research Area(s)

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

Citation Format(s)

A novel equiaxed eutectic high-entropy alloy with excellent mechanical properties at elevated temperatures. / Han, Liuliu; Xu, Xiandong; Li, Zhiming et al.
In: Materials Research Letters, Vol. 8, No. 10, 02.10.2020, p. 373-382.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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