Cold compaction study of Armstrong Process® Ti-6Al-4V powders

Abstract

This work investigates the cold compaction behavior of Ti-6Al-4V powders produced by Armstrong Process®. As-received as well as milled powders were characterized and these powders were uniaxially die-pressed at designated pressures up to 690 MPa to form disk samples with different aspect ratios. Samples with high aspect ratio exhibited non-uniform density along the pressing axis and the density distribution is in consistent with the result predicted by finite element analysis. The linear regression analysis on the experimental density data can be used to predict density of compacts with different aspect ratios. In the studied pressure range, an empirical powder compaction equation represents the green density – pressure relationship very well for both the as-received and 1-hr milled Armstrong Ti-6Al-4V powders.