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Ultrasonic sensing of powder densification

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3 Author(s)
Lu, Yichi ; Intelligent Processing of Materials Laboratory, University of Virginia, Charlottesville, Virginia 22903 ; Wadley, Haydn N.G. ; Parthasarathi, Sanjai

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An independent scattering theory has been applied to the interpretation of ultrasonic velocity measurements made on porous metal samples produced either by a cold or a high‐temperature compaction process. The results suggest that the pores in both processes are not spherical, an aspect ration of 1:3 fitting best with the data for low (≪4%) pore volume fractions. For the hot compacted powders, the pores are smooth due to active diffusional processes during processing. For these types of voids, the results can be extended to a pore fraction of 10%, at which point voids form an interconnected network that violates the model assumptions. The cold pressed samples are not as well predicted by the theory because of poor particle bonding.

Published in:

Journal of Applied Physics  (Volume:71 ,  Issue: 4 )