fcc titanium in titanium/silver multilayers

摘要

The equilibrium phases of titanium are hcp under 1155 K and bcc above this temperature. However, titanium has been shown to exist as fcc when its dimensions are small. We have studied the hcp to fcc transformation in thin titanium layers in an effort to characterize the fee titanium and to understand the driving force behind the transformation. Multilayers of titanium and solver were deposited by electron beam evaporation, and examined by X-ray diffraction and by transmission electron microscopy. The lattice parameter of the fcc titanium was measured to be 0.434 nm and the results eliminated lattice mismatch as a driving force, since it has increased by the transformation.