Abstract
Among various SPD processes used for producing nanocrystalline and ultra‐fine grain (UFG) materials, Equal Channel Angular Pressing (ECAP), is the most well developed processing technique. In the present work, the technologically interesting aluminium alloy AA6061 was selected for study. The strain rate sensitivity of AA6061 has been investigated in a conventional grain sized (CG) state and in two different ultrafine grained (UFG) conditions, processed by ECAP, for 2 and 6 passes at 100° C. Strain rate jump tests in compression were performed at different temperatures, and the strain—rate sensitivity (SRS) exponent m was determined. It is shown that both UFG microstructures, exhibit a strongly increased strain‐rate sensitivity (SRS) compared to CG state. The SRS increases with increasing temperature and is more pronounced for the UFG material processed using 6 ECAP passes.
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