A hot-rolled Ni – Ti –Fe alloy was subjected to 50% cold
rolling by laboratory rolling mill and was subsequently annealed at 8008C for 1.5 h. This sample was then deformed
through another 10% reduction in thickness by two different routes (i) conventional cold rolling and (ii) marforming
(rolling in liquid nitrogen) followed by annealing under
identical conditions. The grain refinement during normal
cold rolling was attributed to relatively large presence of
dislocations in the ND // <110> grains in the starting microstructure. The regions of higher dislocation densities became gradually textured to ND // <111> orientation, with
cold rolling. Marforming (deformation in liquid nitrogen
following phase transformation) on the other hand led to
more significant grain refinement and also change in the
bulk texture. The objective of this study was to compare
the grain refinement and microstructural modification produced through marforming with that obtained in conventional cold deformation.