NEW PHASES FORMED DURING NANOCRYSTALLINE TITANIUM PREPARATION

The nanocrystalline titanium samples, having a grain size of about 10 nm, are prepared by direct current magnetron sputtering and subsequent in situ compaction. Two new phases are observed by means of transmiss ion electron microscopy, one is a body-centered cubic structure with a lattice parameter of a=0.323 nm, the other one is an orthorhombic str ucture with lattice parameters of a=0.303 nm, b=0.391 nm and c=0.488 n m. The formation of the two phases is also tentatively discussed.