Mechanical characteristics under monotonic and cyclic simple shear of spark plasma sintered ultrafine-grained nickel - Archive ouverte HAL Access content directly
Journal Articles Materials Science and Engineering: A Year : 2009

Mechanical characteristics under monotonic and cyclic simple shear of spark plasma sintered ultrafine-grained nickel

B. Hasni
  • Function : Author
T. Szilágyi
  • Function : Author

Abstract

The present work focuses on understanding the mechanical behavior of bulk ultrafine-grained nickel specimens processed by spark plasma sintering of high purity nickel nanopowder and subsequently deformed under large amplitude monotonic simple shear tests and strain-controlled cyclic simple shear tests at room temperature. During cyclic tests, the samples were deformed up to an accumulated von Mises strain of about ɛVM = 0.75 (the flow stress was in the 650–700 MPa range), which is extremely high in comparison with the low tensile/compression ductility of this class of materials at quasi-static conditions. The underlying physical mechanisms were investigated by electron microscopy and X-ray diffraction profile analysis. Lattice dislocation-based plasticity leading to cell formation and dislocation interactions with twin boundaries contributed to the work-hardening of these materials. The large amount of plastic strain that has been reached during the shear tests highlights intrinsic mechanical characteristics of the ultrafine-grained nickel studied here.
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hal-02909015 , version 1 (29-07-2020)

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Salima Bouvier, G. Dirras, J. Gubicza, B. Hasni, T. Szilágyi. Mechanical characteristics under monotonic and cyclic simple shear of spark plasma sintered ultrafine-grained nickel. Materials Science and Engineering: A, 2009, 526 (1-2), pp.201-210. ⟨10.1016/j.msea.2009.07.034⟩. ⟨hal-02909015⟩
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