DUCTILITY ENHANCEMENT OF ULTRAFINE GRAINED COMMERCIALLY PURE 1050 ALUMINUM ALLOY BY CROSS ACCUMULATIVE ROLL-BONDING (C-ARB)

摘要

The Cross-ARB (C-ARB) process -changing rolling direction by 90 degrees for each ARB cycle- has been carried out up to nine cycles on a commercially pure 1050 Al alloy to obtain an ultra-fine grained microstructure. The C-ARB process was adapted with an expectation of increasing ductility of the severely deformed alloy. Microstructures of the C-ARB processed aluminum alloy were examined as a function of accumulated total strain (number of cycles) and direction of the rolling. Tensile properties of the processed aluminum alloy were also investigated. Grain sizes of the C-ARB processed alloy were found to vary across the thickness of the processed alloy plate. Tensile strength of the processed 1050 Al alloy increased from 100MPa to 160MPa. Tensile elongation varied depending on number of process cycle, tensile axis, and rolling direction, but up to 15% of failure strain was measured from a specimen that experienced six and nine C-ARB cycles.