The present study investigated experimentally the effects of temperature, pressure and time upon bulk density of packed bed of magnesium alloy particles. The test particles made of AM 50 A or AZ 91 D were poured into a cylindrical vessel and were applied a given superficial pressure for six hours under a constant temperature condition. The superficial pressure was changed between 2.5 MPa and 10 MPa, and the temperature was varied from 95.5°C to 437°C. The bulk density increased after the pressure was applied and then it reached to a terminal value in cases that the temperature was below 100°C. Continuous increase in the bulk density due to creep deformation was observed in cases that the temperature was over 150°C, and it became remarkable in cases that the temperature was over 250°C. The bulk density at a certain time was increased with an increase in the temperature and the superficial pressure. The increasing rate of the bulk density could be expressed as a function of temperature, superficial pressure and the bulk density.
