Consolidation behavior and hardness of P/M molybdenum

In this study, the consolidation behavior and hardness of commercially available molybdenum powder were investigated. In order to analyze the compaction response of the powder theoretically, an elastoplastic constitutive equation based on the yield function presented by Shima and Oyane was applied to predict the compact density under uniaxial pressure from 100 MPa to 700 MPa. The compacts were sintered at 1400–1600 °C for 20–60 min. The sintered density and grain size of molybdenum were increased with increasing the compacting pressure and processing temperature and time. The effect of the porosity and grain size on the hardness of the specimens was explained based on the modified plasticity theory of porous material and the Hall–Petch type equation.

The compaction and sintering behaviors of molybdenum powder were investigated with varying compacting pressure, sintering time and temperature. The theoretical consolidation behavior of the powder was calculated by applying the yield function suggested by Shima and Oyane. The effect of grain size and porosity of the specimen on the hardness was studied.Figure optionsDownload as PowerPoint slide