Abstract
Aluminum-lithium alloy 1420, which, after equal-channel angular pressing, has a grain size of about 3 µm, is shown to possess superplasticity in a temperature range of T=320–395°C upon tension at a constant relative strain rate of 10−2–10−3 s−1. The axial deformation at fracture can exceed 1800%. The data processing at such large deformations should be carried out using true strains ɛt and stresses σt. In the flow curve, a short stage of hardening is followed by a long softening stage. They can be described by the relation \(\dot \varepsilon _t \sim \sigma _t^n \exp ( - U/kT)\) with a constant exponent n≈2 and activation energies U≈1 eV for the softening stage and U≈1.4 eV for the hardening stage. The deformation is supposed to be controlled by grain-boundary sliding at the stage of softening and by self-diffusion in the bulk of grains at the hardening stage.
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Translated from Fizika Tverdogo Tela, Vol. 43, No. 5, 2001, pp. 833–838.
Original Russian Text Copyright © 2001 by Myshlyaev, Prokunin, Shpeizman.
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Myshlyaev, M.M., Prokunin, M.A. & Shpeizman, V.V. Mechanical behavior of microcrystalline aluminum-lithium alloy under superplasticity conditions. Phys. Solid State 43, 865–870 (2001). https://doi.org/10.1134/1.1371367
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DOI: https://doi.org/10.1134/1.1371367