Alloy design, micromechanical and macromechanical properties of CoCrFeNiTax eutectic high entropy alloys

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

10 Scopus Citations
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Author(s)

  • Cheng Ai
  • Feng He
  • Min Guo
  • Jian Zhou
  • Zhanwei Yuan
  • Yajie Guo
  • Yinliang Liu
  • Lin Liu

Detail(s)

Original languageEnglish
Pages (from-to)2653-2662
Journal / PublicationJournal of Alloys and Compounds
Volume735
Online published5 Dec 2017
Publication statusPublished - 25 Feb 2018
Externally publishedYes

Abstract

Based on binary phase diagrams and thermodynamic calculation, CoCrFeNiTax (x = 0.1, 0.3, 0.43, 0.5 and 0.7) eutectic high entropy alloys were designed. With increasing Ta content, as-cast microstructure changed from hypoeutectic (primary γ phase) to eutectic and to hypereutectic (primary Laves phase), and CoCrFeNiTa0.43 eutectic alloy was composed of γ phase with face-center cubic (FCC) structure and C14 type Laves phase with hexagonal close-packed (HCP) structure. Volume fraction of Laves phase increased with increasing Ta content, and thus microhardness was basically positive correlation with Ta content. Meanwhile, microhardness and elastic modulus of primary phase increased from primary γ phase to primary Laves phase, while hardness and elastic modulus of eutectic phases firstly decreased and then increased with increasing Ta content. In addition, based on nanoindentation load-displacement curves, the reverse analysis algorithms were used to obtain initial yield stress σy and strain hardening exponent n of primary γ phase and eutectic phases. Moreover, with increasing Ta content, the plasticity of CoCrFeNiTax alloys decreased, while the compression strength firstly increased and then decreased, and CoCrFeNiTa0.43 EHEA showed relatively high strength (2377 MPa) and relatively high plastic strain (17.5%).

Research Area(s)

  • Compression properties, Elastic modulus, Eutectic high entropy alloys, Hardness, Microstructure

Citation Format(s)

Alloy design, micromechanical and macromechanical properties of CoCrFeNiTax eutectic high entropy alloys. / Ai, Cheng; He, Feng; Guo, Min; Zhou, Jian; Wang, Zhijun; Yuan, Zhanwei; Guo, Yajie; Liu, Yinliang; Liu, Lin.

In: Journal of Alloys and Compounds, Vol. 735, 25.02.2018, p. 2653-2662.

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