Microstructure and mechanical properties of equimolar FeCoCrNi high entropy alloy prepared via powder extrusion

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Bin Liu
  • Jingshi Wang
  • Yong Liu
  • Qihong Fang
  • Yuan Wu
  • Shiqi Chen

Detail(s)

Original languageEnglish
Pages (from-to)25-30
Journal / PublicationIntermetallics
Volume75
Online published1 Jun 2016
Publication statusPublished - Aug 2016

Abstract

An equiatomic FeCoCrNi high alloy (HEA) with both high tensile strength and ductility was produced by a powder metallurgy (P/M) method. The P/M process includes a gas atomization and a hot extrusion of pre-alloyed HEA powder. Microstructures and mechanical properties were characterized using optical microscopy (OP), scanning electron microscopy (SEM), electron backscattered diffraction (EBSD), and tensile tests. The results show that the P/M FeCoCrNi HEA has a single face centered cubic (fcc) structure and an equiaxed microstructure. No obvious porosity and brittle intermetallic phase was found. The as-extruded alloy exhibits a very high tensile strength of 712.5 MPa, and still maintains an elongation as high as 56%. The improvement of the tensile properties is caused by the solid solution strengthening, grain boundary strengthening and homogenous microstructure. Therefore, the powder hot extrusion can be considered as a promising way for preparing large-sized HEAs with high mechanical properties.

Research Area(s)

  • Electron backscatter diffraction, Extrusion, High entropy alloys, Mechanical properties, Microstructures, Powder metallurgy

Citation Format(s)

Microstructure and mechanical properties of equimolar FeCoCrNi high entropy alloy prepared via powder extrusion. / Liu, Bin; Wang, Jingshi; Liu, Yong; Fang, Qihong; Wu, Yuan; Chen, Shiqi; Liu, C. T.

In: Intermetallics, Vol. 75, 08.2016, p. 25-30.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review