THE FORMATION OF FCC TITANIUM IN TITANIUM-ALUMINUM MULTILAYERS

The Ti layers in Al/Ti multilayers are shown to transform from hexagon al close packed in the as-deposited multilayers to face centered cubic on ion milling in cross-section. By examining the change in free ener gy of the system on transformation it is demonstrated that interfacial , surface and strain free energies cannot overcome the theoretically p redicted 0.08 eV/atom difference in bulk free energy between f.c.c. an d h.c.p. Ti. Based on experimental observations of f.c.c. Ti in multil ayers, it is argued that this value is too large.