The equal channel angular pressing(ECAP) of 2J4 alloy was studied at room temperature with route A in which the sample was not rotated after pressing one pass and entered directly the next pass.The evolution of microstructure of 2J4 alloy after ECAP was investigated by means of optical microscopy(OM) and transmission electron Microscopy(TEM).The results show that the total equivalent true strain of 2J4 alloy is about 3.0 after ECAP,which is corresponding to the depressing amount of 90%.After one pass ECAP,the grain of the alloy changed into the lath martensite of 0.35μm in width and 2.5μm in length from 30μm in diameter.When the deformation pass increased,the martensite refined farther and the lath martensite transformed into the equiaxed grains.Moreover,the amount of α phase increased along with the increase of deformation amount.
Key words
equal channel angula /
ultrafine grain /
martensite
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