Abstract
An internal stress has been introduced by the blocking of grain boundary sliding at 548 K by small coherent γ-Fe particles on a small angle boundary in bicrystals of a Cu-Fe alloy. The martensitic transformation in larger γ-Fe particles is more easily induced by the internal stress during cooling to 77 K. The effect of plastic strain on the transformation is completely retarded. Some specific martensite variants are formed preferentially and the results can be well explained by postulating that the internal stress aids the lattice shear deformation involved in the f.c.c. to b.c.c. lattice change.
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