Abstract
1. Using the theory of volume viscous flow of porous material, an analysis was carried out of the powder densification process, as a result of which it was established that ultrasonic vibrations raise the effective pressure in hot compaction. 2. The application of ultrasonic vibrations during the steady-state stage of powder particle creep in hot pressing accelerates creep and temporarily disturbs steady-state flow. 3. In hot pressing, the creep rate of iron and nickel powder particles is proportional to the square of the stress; it is shown that creep under these conditions is controlled by the dislocation climb process. 4. It was established that the efficiency of ultrasonic vibrations decreases with rise in temperature.
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