Mo5Si3 precipitates in MoSi2 single crystals have been studied. The or
ientation relationship between the long rectangular lath-like precipit
ates and the matrix is [110]MoSi2\\[110]Mo5Si3 and (002)MoSi2\\(220BAR
)Mo5Si3. Two sets of misfit dislocations extend along the long dimensi
ons of the precipitates.