Hot Isostatic Pressing of Mechanically Alloyed Cu-Nb Powders

摘要

The high hardnesses of mechanically alloyed powders, as well as their oftenirregular shapes, make them difficult to densify by conventional sintering schemes. For example, making a non-friable green compact from mechanically alloyed powders is difficult as a result of the hardness factor. Consolidation of mechanically alloyed powders is thus most often accomplished by hot extrusion or a variant thereof. Hot isostatic pressing (HIPing) is a potential route for densification of mechanically alloyed products. Here we report on densification progression and describe partially densified micro-structures of mechanically alloyed Cu-Nb powders. Hot isostatic pressing is also a process for which extensive modeling has been developed (1-3). The models are robust ones, and software is now available to predict density as a function of process temperature, pressure and time, provided the ancillary material mechanical and thermal properties are available (4). We also report on the suitability of using this tool for predicting densification during HIPing of mechanically alloyed products.