The influence of severe plastic deformation regimes (the equal channel angular pressing and torsion under high
pressure) on microstructure parameters, phase content and characterisrics of superplasticity of industrial aluminum
alloys 1421 and 1570 is analyzed. It is shown that the creation of thermostable submicro- and nanocrystalline structure
provides high strain rate and low temperature superplasticity in these alloys. The distinctive features of high strain rate
superplasticity are determined and the estimation of different mechanisms of plastic flow contribution into the total
deformation is made. The role of nonequilibrium state of grain boundaries into the effects of high strain rate and low
temperature superplasticity is considered.
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