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Strengthening and weakening by repeated dynamic impact in microcrystals and nanocrystals

Abstract : Experiments on micrograined (mg) and nanocrystalline (nc) Ni revealed strengthening and weakening following repeated dynamic impact. The strengthening in mg-Ni arises from intragranular dislocations without a significant change in grain size, whereas the weakening in nc-Ni is due to concurrent grain growth. The strength of mg and nc-Ni samples after deformation settles at similar to 900 MPa, with differing contributions from intragranular dislocations and grain sizes.
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https://hal.univ-lorraine.fr/hal-01514956
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Submitted on : Wednesday, April 26, 2017 - 6:27:29 PM
Last modification on : Thursday, March 11, 2021 - 2:24:17 PM

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Thangaraju Shanmugasundaram, Emmanuel Bouzy, A. H. Chokshi. Strengthening and weakening by repeated dynamic impact in microcrystals and nanocrystals. Materials Science and Engineering: A, Elsevier, 2015, 639, pp.97-102. ⟨10.1016/j.msea.2015.04.086⟩. ⟨hal-01514956⟩

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