Stress-induced phase transitions(B2-L1(0), B2-fcc) on an FeRh alloy we
re investigated with X-ray diffraction (XRD) and transmission electron
microscopy(TEM). An Fe-50.5at%Rh alloy was rolled to 80 mu m thicknes
s, and annealed at 1370K for 173ks. Annealed sample sheets were cold r
olled at various rolling rates, and changes of the sample alloy on the
phase state were investigated with XRD. The L1(0) phase appeared in t
he early stage of cold work. With heavy work appearance of the fee pha
se and consequent decrease of L1(0) were observed. Destruction of the
order of B2 phase was also observed with progress of cold working. The
crystallography and morphology of stress induced phases were studied
with TEM. L1(0) phase grains were appeared as layers of about 100 to 1
000nm thickness, and density of dislocations in them were extremely hi
gh. The separate appearance of fcc phase from L1(0) phase was found in
B2 phase grains. The result is negative to an idea that the L1(0) pha
se is an intermediate phase of the B2-fcc transition.