Influence of Strain Rate on the Effect of Plasticization of High-Strength Ultrafine-Grained Al-Cu-Zr Alloy

The influence of the strain rate on plasticization effect (PE) 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 level strength (ultimate tensile ~465 MPa) UFG was achieved as result additional deformation-heat treatment (DHT), consisting low-temperature annealing and small deformation. It is shown that PE after DHT retained when changes from 10 -4 to -3 s -1 decreases half with its further -2 . values strain-rate sensitivity coefficient for were determined both states before DHT. Possible reasons suppression at rates (≥10 ) are discussed. Keywords: aluminum alloys, severe plastic deformation, structure, strength, plasticity, sensitivity.