Transactions of Nanjing University of Aeronautics & Astronautics
Study on Microhardness and Texture of AlFeMn Alloy Sheets During Cold Rolling
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Abstract:
The microhardness and texture of cold rolled AlFeMn alloy sheets were investigated by means of hardness tester， transmission electron microscopy（TEM）， and X-ray diffraction（XRD）. It was found that the hardness of the rolled AlFeMn alloy sheet increased with the increase of cold rolling reduction， reaching the peak at 82% cold rolling reduction， and then decreasing. Simultaneously， the dislocation density of the rolled sheets decreased obviously， accompanied by the polygonization of sub-structures. It showed that there was a transition from work hardening to work softening during the cold rolling of AlFeMn alloy. At low and medium strains （≤78% cold rolling reduction）， the content of copper and S orientation increased slightly with the increase of cold rolling reduction， while the content of Brass orientation remained almost unchanged. When the cold rolling reduction reached 82%， the content of copper， S and Brass increased sharply， and then decreased sharply when the cold rolling reduction exceeded 84%. The content of cube orientation decreased during the work hardening and increased slightly at the end of work softening. The results showed that the occurrence of work softening was accompanied by changes in grain orientation.
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Clc Number:
TG146.2
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