Local chemical fluctuation mediated ultra-sluggish martensitic transformation in high-entropy intermetallics

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

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Author(s)

  • Yuan Wu
  • Fei Zhang
  • Fengshou Li
  • Yi Yang
  • Jiaming Zhu
  • Hong-Hui Wu
  • Yao Zhang
  • Ruitao Qu
  • Zhefeng Zhang
  • Zhihua Nie
  • Yandong Wang
  • Xiongjun Liu
  • Hui Wang
  • Zhaoping Lu

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)804-814
Journal / PublicationMaterials Horizons
Volume9
Issue number2
Online published2 Dec 2021
Publication statusPublished - 1 Feb 2022

Abstract

Superelasticity associated with martensitic transformation has found a broad range of engineering applications, such as in low-temperature devices in the aerospace industry. Nevertheless, the narrow working temperature range and strong temperature sensitivity of the first-order phase transformation significantly hinder the usage of smart metallic components in many critical areas. Here, we scrutinized the phase transformation behavior and mechanical properties of multicomponent B2-structured intermetallic compounds. Strikingly, the (TiZrHfCuNi)83.3Co16.7 high-entropy intermetallics (HEIs) show superelasticity with high critical stress over 500 MPa, high fracture strength of over 2700 MPa, and small temperature sensitivity in a wide range of temperatures over 220 K. The complex sublattice occupation in these HEIs facilitates formation of nano-scaled local chemical fluctuation and then elastic confinement, which leads to an ultra-sluggish martensitic transformation. The thermal activation of the martensitic transformation was fully suppressed while the stress activation is severely retarded with an enhanced threshold stress over a wide temperature range. Moreover, the high configurational entropy also results in a small entropy change during phase transformation, consequently giving rise to the low temperature sensitivity of the superelasticity stress. Our findings may provide a new paradigm for the development of advanced superelastic alloys, and shed new insights into understanding of martensitic transformation in general.

Research Area(s)

  • SHAPE-MEMORY ALLOY, FREE-ENERGY, CONCENTRATION MODULATION, SPECIMEN PREPARATION, NONUNIFORM SYSTEM, MICROSTRUCTURE, STRESS, ORDER, NUCLEATION, REDUCTION

Citation Format(s)

Local chemical fluctuation mediated ultra-sluggish martensitic transformation in high-entropy intermetallics. / Wu, Yuan; Zhang, Fei; Li, Fengshou; Yang, Yi; Zhu, Jiaming; Wu, Hong-Hui; Zhang, Yao; Qu, Ruitao; Zhang, Zhefeng; Nie, Zhihua; Ren, Yang; Wang, Yandong; Liu, Xiongjun; Wang, Hui; Lu, Zhaoping.

In: Materials Horizons, Vol. 9, No. 2, 01.02.2022, p. 804-814.

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