Abstract
The effect of deformation temperature on microstructure evolution during equal channel angular pressing (ECAP) was studied in a coarse grained 2219 Al alloy at temperatures from 250 to 475°C. The structural changes taking place during ECAP up to strains of 12 were investigated. New fine grains with high angle boundaries (HABs) begin to form clearly at strains of around 3 irrespective of deformation temperature. An increase in the pressing temperature leads to decreasing the volume fraction and increasing the size of new grains with HABs. This can be attributed to the relaxation of strain compatibilities between grains due to frequent operation of dynamic recovery at high temperature. The mechanism of grain refinement is discussed in detail.
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