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Influence of Strain Rate on the Effect of Plasticization of High-Strength Ultrafine-Grained Al-Cu-Zr Alloy
Russian version
DOI: 10.21883/PSS.2022.06.54370.297
Sadykov D. I.1, Orlova T. S.2, Murashkin M. Yu.3
1ITMO University, St. Petersburg, Russia
2Ioffe Institute, St. Petersburg, Russia
3Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, Ufa, Russia
Email: orlova.t@mail.ioffe.ru
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The influence of the strain rate on the plasticization effect (PE) of ultrafine-grained (UFG) Al-1.47Cu-0.34Zr (wt%) alloy structured by high pressure torsion. A significant increase in plasticity (more than 2 times) while maintaining a high level of strength (ultimate tensile strength ~465 MPa) in the UFG alloy was achieved as a result of additional deformation-heat treatment (DHT), consisting of low-temperature annealing and a small additional deformation. It is shown that the PE after DHT is retained when the strain rate changes from 10-4 to 10-3 s-1 and decreases by half with its further increase to 10-2 s-1. The values of the strain-rate sensitivity coefficient for the UFG Al-1.47Cu-0.34Zr (wt%) alloy were determined in both states before and after DHT. Possible reasons of the PE suppression at high strain rates (≥10-2 s-1) are discussed. Keywords: aluminum alloys, severe plastic deformation, ultrafine-grained structure, strength, plasticity, strain-rate sensitivity.
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