Achieving ultra-high strength in a precipitation-hardened CoCrNi-based medium-entropy alloy with partially recrystallized microstructure and heterogeneous grains

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

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Author(s)

  • Lu Zhang
  • Xinghao Du
  • Li Zhang
  • Yuxin Liang
  • Jianxin Yu
  • Naifu Zou
  • Gang Wan
  • Yan Tang
  • Guosheng Duan
  • Baolin Wu

Detail(s)

Original languageEnglish
Article number110169
Journal / PublicationVacuum
Volume188
Online published6 Mar 2021
Publication statusOnline published - 6 Mar 2021

Abstract

A η*-Ni6(Al,Ti)Nb strengthened CoCrNi-based medium-entropy alloy with partially recrystallized and heterogeneous grain microstructure was prepared. Block and lamellar η*-Ni6(Al,Ti)Nb phases were present in different regions. Excellent tensile properties were achieved with yield strength of 1.34 GPa, ultimate tensile strength of 1.55 GPa and ductility of 9.2%. The deformation mode was dominated by stacking faults in all grains at the beginning of deformation and then relied on dislocation slip in the recrystallized grains. The high strain hardening rate is due to the intense obstruction effect of the η*-Ni6(Al,Ti)Nb phase for dislocation movement and the hard-deformed non-recrystallized grains. Our findings provide a wider range of options for the selection of the precipitation phase.

Research Area(s)

  • Medium-entropy alloy, Plastic deformation, Precipitation, Work hardening

Citation Format(s)

Achieving ultra-high strength in a precipitation-hardened CoCrNi-based medium-entropy alloy with partially recrystallized microstructure and heterogeneous grains. / Zhang, Lu; Du, Xinghao; Zhang, Li; Li, Wanpeng; Liang, Yuxin; Yu, Jianxin; Zou, Naifu; Wan, Gang; Tang, Yan; Duan, Guosheng; Wu, Baolin.

In: Vacuum, Vol. 188, 110169, 06.2021.

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