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Work softening in shock-loaded nickel

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Abstract

It is shown that nickel shock loaded to a pressure of 20 GN/m2 (200 Kbar) and pulse durations of 1.2, 2.4 and 10.1 μ.sec exhibits work softening upon subsequent uniaxial tensile deformation at ambient temperature and nominal strain rate of 10 sec. When the tensile deformation on the preshocked sample is conducted at 77 K, work softening is inhibited. It is proposed, in accordance with the findings of Longo and Reed-Hill (Metallography, vol. 7, p. 181, 1974) that work softening is due to dynamic recovery that during conventional deformation replaces the shock-loading substructure (small cells, with illdefined walls) by the substructure characteristic of the conventional deformation at the imposed conditions. Since the quasi-static deformation substructure at 77 K is quite similar to the shock-induced one, work softening is inhibited at that temperature.

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Authors and Affiliations

  1. Department of Metallurgical Engineering, South Dakota School of Mines and Technology, 57701, Rapid City, SD

    Marc A. Meyers (Assistant Professor)

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  1. Marc A. Meyers
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Formerly with the Department of Materials Science and Engineering, Instituto Militar de Engenharia, Rio de Janeiro, Brazil.

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Meyers, M.A. Work softening in shock-loaded nickel. Metall Trans A 8, 1581–1583 (1977). https://doi.org/10.1007/BF02644862

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