A high specific strength, deformation-processed scandium-titanium composite

A 59% Sc-41% Ti deformation-processed metal-metal composite was produced by rolling to a true strain of 2.3 at 873 K followed by cold rolling to a tot al true strain of 3.6. Rolling reduced the original eutectoid microstructur e to lamellae of alpha-Sc and alpha-Ti with average lamellar thicknesses of 150 nm (Sc) and 120 nm (Ti). The cold-rolled material had an ultimate tens ile strength of 942 MPa and a specific strength of 259 J/g, The Sc matrix w as oriented with the [0001] tilted 22 degrees from the sheet normal directi on toward the rolling direction, an unusual texture for an HCP metal with a low cia ratio, which suggests Sc may deform primarily by basal slip.