Two-Tier Compatibility of Superelastic Bicrystal Micropillar at Grain Boundary

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

2 Scopus Citations
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Author(s)

  • Mostafa Karami
  • Zeyuan Zhu
  • Zhuohui Zeng
  • Nobumichi Tamura
  • Xian Chen

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)8332–8338
Journal / PublicationNano Letters
Volume20
Issue number11
Online published20 Oct 2020
Publication statusPublished - 11 Nov 2020

Abstract

Both crystallographic compatibility and grain engineering are super critical to the functionality of shape memory alloys, especially at micro- and nanoscales. Here, we report a bicrystal CuAl24Mn9 micropillar engraved at a high-angle grain boundary (GB) that exhibits enhanced reversibility under very demanding driving stress (about 600 MPa) over 10 000 transformation cycles despite its lattice parameters are far from satisfying any crystallographic compatibility conditions. We propose a new compatibility criterion regarding the GB for textured shape memory alloys, which suggests that the formation of GB compatible twin laminates in neighboring textured grains activates an interlock mechanism, which prevents dislocations from slipping across GB.

Research Area(s)

  • Compatibility, Grain Boundary, Micropillar compression, Nanomechanics

Citation Format(s)

Two-Tier Compatibility of Superelastic Bicrystal Micropillar at Grain Boundary. / Karami, Mostafa; Zhu, Zeyuan; Zeng, Zhuohui; Tamura, Nobumichi; Yang, Yong; Chen, Xian.

In: Nano Letters, Vol. 20, No. 11, 11.11.2020, p. 8332–8338.

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