Dual heterogeneous structures lead to ultrahigh strength and uniform ductility in a Co-Cr-Ni medium-entropy alloy

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

13 Scopus Citations
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Author(s)

  • X. H. Du
  • H. T. Chang
  • G. S. Duan
  • B. L. Wu
  • W. S. Chuang
  • Y. Lu
  • M. L. Sui
  • E. W. Huang

Detail(s)

Original languageEnglish
Article number2390
Journal / PublicationNature Communications
Volume11
Online published13 May 2020
Publication statusPublished - 2020

Link(s)

Abstract

Alloys with ultra-high strength and sufficient ductility are highly desired for modern engineering applications but difficult to develop. Here we report that, by a careful controlling alloy composition, thermomechanical process, and microstructural feature, a Co-Cr-Ni-based medium-entropy alloy (MEA) with a dual heterogeneous structure of both matrix and precipitates can be designed to provide an ultra-high tensile strength of 2.2 GPa and uniform elongation of 13% at ambient temperature, properties that are much improved over their counterparts without the heterogeneous structure. Electron microscopy characterizations reveal that the dual heterogeneous structures are composed of a heterogeneous matrix with both coarse grains (10∼30 μm) and ultra-fine grains (0.5∼2 μm), together with heterogeneous L12-structured nanoprecipitates ranging from several to hundreds of nanometers. The heterogeneous L12 nanoprecipitates are fully coherent with the matrix, minimizing the elastic misfit strain of interfaces, relieving the stress concentration during deformation, and playing an active role in enhanced ductility.

Research Area(s)

Citation Format(s)

Dual heterogeneous structures lead to ultrahigh strength and uniform ductility in a Co-Cr-Ni medium-entropy alloy. / Du, X. H.; Li, W. P.; Chang, H. T.; Yang, T.; Duan, G. S.; Wu, B. L.; Huang, J. C.; Chen, F. R.; Liu, C. T.; Chuang, W. S.; Lu, Y.; Sui, M. L.; Huang, E. W.

In: Nature Communications, Vol. 11, 2390, 2020.

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

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