Abstract
Commercially pure Al alloy sheets were processed using high-strain-rate, dissimilar-channel angular pressing (DCAP) for as many as 100 passages through a channel with φ=120 deg, to investigate the work hardening caused by a low strain level (ɛ<2) and the work softening caused by an extremely high strain level (3<ɛ<58). The hardness of the alloy increased significantly by a factor of 2 at strains less than ∼2, while a gradual decrease in the hardness was observed at strains greater then ∼2. The work-hardening and the work-softening behaviors observed from the Al alloy were analyzed by correlating the measured properties with microstructural evolutions observed by transmission electron microscopy (TEM). A detailed microstructural-evolution sequence occurring at successive strain stages was also investigated based on TEM and electron backscattered diffraction (EBSD).
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