Abstract
Bars of MA 6000 have been extruded at a ratio of 2·75:1 at a temperature of 1100°C, subjected to a zone recrystallisation treatment in a calibrated gradient furnace, and the (secondary) recrystallisation interface studied. By selected area channelling, a 〈110〉 texture has been identified, which is attributed to the ability of 〈110〉 tilt boundaries to form low energy interfaces of a close packed nature. A curved secondary recrystallisation interface is observed and this is shown to result indirectly from the strain gradients during extrusion. A microbeam electron diffraction technique has enabled the orientations of the submicrometre sized equiaxed grains in the hot worked orientations to be studied. It has been shown that, as the temperature is increased in the less severely deformed regions of the samples, rotation of the grains to lower energy orientations (〈110〉) occurs.
MST/1211
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