New composites have been developed by mechanically working mixtures of immiscible, ductile metals to severe deformations to reduce the two metals' phase thicknesses to the order of 10[superscript]-2 [mu]m. Many deformation processed composites have been produced using cubic metals. These composites are crystallographically textured filamentary microstructures with unusually high ultimate tensile strengths (UTS) and high ductility;This study produced a deformation processed composite using two hexagonal close packed (hcp) immiscible metals, Ti and Y. A 75mm diameter ingot of Ti containing 20% by volume Y was cast and deformation processed by extrusion, swaging, and wire drawing to true strain 12.8. A similar ingot of pure Ti was cast and deformation processed to true strain 10.0 as a control specimen. Both compositions were annealed at 700°C. after every 60% reduction in area and examined by gas fusion analysis, tensile testing, x-ray texture analysis, optical microscopy, SEM, and TEM as the deformation progressed;The Ti and Y phases both developed the \langle 10[macron]10\rangle fiber texture typical of low c/a ratio, drawn hcp metals. Crystals so textured must deform by plane strain, and the Ti and Y filaments acquired a ribbon shape as the deformation processing narrowed and elongated each phase. These ribbon-shaped filaments bent around one another as each crystal accommodated the plane strain of neighboring crystals;As the deformation processing true strain increased from 0 to 7.27, the average phase thickness decreased from 13[mu]m to 0.36[mu]m for the Ti and from 2.9[mu]m to 0.084[mu]m for the Y. At true strains greater than 7.27, the filamentary microstructure recrystallized to a fine-grained, equiaxed structure. At true strain 12.2, the resulting equiaxed structure had an average grain diameter of 0.20[mu]m and 698 MPa UTS. The applicability of various mathematical models developed to characterize cubic deformation processed alloys is discussed with respect to this hcp composite, and a potentially strong hcp-hcp sheet composite is proposed to employ the plane strain in these textured phases to best advantage.