In general, irradiation of materials by high energy electrons, protons or neutrons has been shown to stabilize the existing microstructure against subsequent martensitic transformation. Alloys which have been studied include the binary intermediate phases NiTi and Ni63Al37 and ternary phases between Cu37,5Al62.5 and CU63.6Al36.4 as well as the intermetallic Cu69.01Al17.92 Zn12.17. In these materials, the martensitic transformations are known to be sensitive to small changes in chemical composition and to the degree of long range order. In addition, one should expect the kinetics of martensitic transformations to be sensitive to other forms of structural damage introduced during irradiation also. This spectrum of irradiation-induced phenomena renders the interpretation of results in studies of such concentrated binary and ternary phases rather complicated, therefore.We present here the preliminary results of a study of the effect of electron irradiation on the character of
the martensitic transformation in a relatively dilute terminal solid solution of Co+5.75 wt pet Fe, similar in
composition to that employed for studies of the transformation mechanism itself.