Two-Tier Compatibility of Superelastic Bicrystal Micropillar at Grain Boundary | Zendy

Mostafa Karami | Zendy; Zeyuan Zhu | Zendy; Zhuohui Zeng | Zendy; Nobumichi Tamura | Zendy; Yong Yang | Zendy; Xian Chen | Zendy

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Two-Tier Compatibility of Superelastic Bicrystal Micropillar at Grain Boundary

Author(s) -

Mostafa Karami,

Zeyuan Zhu,

Zhuohui Zeng,

Nobumichi Tamura,

Yong Yang,

Xian Chen

Publication year - 2020

Publication title -

nano letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 4.853

H-Index - 488

eISSN - 1530-6992

pISSN - 1530-6984

DOI - 10.1021/acs.nanolett.0c03486

Subject(s) - compatibility (geochemistry) , materials science , grain boundary , slipping , shape memory alloy , composite material , crystallography , condensed matter physics , microstructure , structural engineering , chemistry , physics , engineering

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 CuAl 24 Mn 9 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.

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