MODELING THE CONSOLIDATION BEHAVIOR OF AN ALPHA-2-TITANIUM ALUMINIDE POWDER

The consolidation of an alpha-two titanium aluminide powder was analyz ed using an approach based on two density dependent variables: the app arent Poisson's ratio and a stress intensification (geometric hardenin g) factor. Uniaxial compression tests on samples with different relati ve densities were used to obtain the the apparent Poisson's ratio and constitutive behaviour. Microhardness tests on undeformed and deformed samples with different relative densities were used to obtain the str ess intensification factor. With this information, a von Mises type yi eld function, modified for pressure effects, was developed and impleme nted into a finite element code and used successfully to model the den sification of the alpha-two titanium aluminide powder.