Am. Russell et al., A comparison of strengthening mechanisms in rolled and axisymmetrically deformed Ti-20Y composites, J MATER SCI, 34(7), 1999, pp. 1447-1460
Two Ti-20%Y metal-metal composites were deformation processed: one axisymme
trically and the other by rolling. The microstructures, preferred crystallo
graphic orientations, and tensile strengths of each were measured periodica
lly as the deformation progressed. The axisymmetrically deformed Ti matrix
developed a [10 (1) over bar 0] fiber texture, and the rolled composite acq
uired a texture with the [0001] tilted 31 degrees from the sheet normal tow
ard the transverse direction with [10 (1) over bar 0] parallel to the rolli
ng direction. The orientations of the {10 (1) over bar 10}[11 (2) over bar
0] and [0002][11 (2) over bar 0] slip systems in Ti with these textures wer
e used in conjunction with the maximum possible slip distances for dislocat
ion travel in each specimen to demonstrate that the axisymmetrically deform
ed material should be stronger than the rolled material for composites of e
qual phase thickness and spacing. The strengths of the two composites measu
red in this study were compared at similar microstructural phase sizes and
spacings, and the axisymmetrically deformed composite was indeed found to b
e somewhat stronger, although the difference in strengths was not large. (C
) 1999 Kluwer Academic Publishers.