Densification behavior of titanium alloy powder during hot pressing

Abstract

Densification behaviors of titanium alloy (Ti-6Al-4V) powder were investigated during hot pressing at various high temperatures. Experimental data were obtained under the instantaneous compaction and subsequent creep densification. The constitutive models of Fleck et al. and the modified Gurson were employed for thermo-plastic deformation under the instantaneous compaction. The constitutive model of Abouaf and co-workers was also considered for creep densification of titanium alloy powder under constant pressure during hot pressing. By implementing these constitutive equations into a finite element program (abaqus), finite dement calculations were compared with experimental data. The finite element results by using the models of Fleck et al. and the modified Gurson agreed well with. the experimental data for densification and density distribution of titanium alloy powder. However, on using the model of Abouaf and co-workers the finite element results overestimate the experimental data. (C) 2001 Elsevier Science B.V. All rights reserved.