Effect of the Rate of Multiaxial Compression at Room Temperature on the Evolution of Microstructure of Commercial-Purity Aluminum

Resumo

Commercial-purity aluminum of grade 1050 obtained by uniaxial or multiaxial compression at room temperature at deformation rates from 1.2 × 10³ to 1.0 × 10 ^{− 3} sec ^{− 1} is studied. The true strain per one pass is kept constant while the total strain amounts to 1.6 in uniaxial deformation and to 3.0 in multiaxial one. The microstructure is determined using a transmission electron microscope. The high-rate deformation is shown to be the most effective for refining the structure due to elevation of the dislocation density and suppression of the dynamic recovery.