Non-Hookean large elastic deformation in bulk crystalline metals

Sheng Xu (), Takumi Odaira, Shunsuke Sato, Xiao Xu, Toshihiro Omori, Stefanus Harjo, Takuro Kawasaki, Hanuš Seiner, Kristýna Zoubková, Yasukazu Murakami and Ryosuke Kainuma ()
Additional contact information
Sheng Xu: Tohoku University
Takumi Odaira: Tohoku University
Shunsuke Sato: Tohoku University
Xiao Xu: Tohoku University
Toshihiro Omori: Tohoku University
Stefanus Harjo: J-PARC Center, Japan Atomic Energy Agency
Takuro Kawasaki: J-PARC Center, Japan Atomic Energy Agency
Hanuš Seiner: Czech Academy of Sciences
Kristýna Zoubková: Czech Technical University in Prague
Yasukazu Murakami: Kyushu University
Ryosuke Kainuma: Tohoku University

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract Crystalline metals can have large theoretical elastic strain limits. However, a macroscopic block of conventional crystalline metals practically suffers a very limited elastic deformation of 4.3% in a Cu-based single crystalline alloy at its bulk scale at room temperature. The large macroscopic elastic strain that originates from the reversible lattice strain of a single phase is demonstrated by in situ microstructure and neutron diffraction observations. Furthermore, the elastic reversible deformation, which is nonhysteretic and quasilinear, is associated with a pronounced elastic softening phenomenon. The increase in the stress gives rise to a reduced Young’s modulus, unlike the traditional Hooke’s law behaviour. The experimental discovery of a non-Hookean large elastic deformation offers the potential for the development of bulk crystalline metals as high-performance mechanical springs or for new applications via “elastic strain engineering.”

Date: 2022
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DOI: 10.1038/s41467-022-32930-9

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