A series of in situ, deformation processed metal matrix composites have been produced by direct powder extrusion of blended constituents. The resulting composites are comprised of a metallic Ti-6Al-4V matrix containing dispersed and co-deformed intermetallic matrix composite (IMC) reinforcements. The IMC is comprised of discontinuous TiB2 Particulate within a titanium trialuminide matrix. Thus, an example of a resulting composite would be Ti-6Al-4V + 40 v% (Al3Ti + 40 v% TiB2), with the IMC having a high aspect ratio morphology as a consequence of deformation processing. The degree to which both constituents deform during direct powder extrusion has been examined using systematic variations in the percentage of TiB2 within the IMC, and by varying the percentage of IMC within the metal matrix. In the former instance, variation of the TiB2 percentage effects variations in relative flow behavior; while in the latter, varying the percentage of IMC within the metallic matrix effects changes in strain distribution among components. The results indicate that successful codeformation processing requires a criterion that incorporates ductility in addition to the more traditionally-advanced relative flow stress criterion.