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Communication Dans Un Congrès Année : 2012

Ultrasonic characterization of mechanical properties of metal powders

Laurianne Barguet
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Résumé

In modern industrial applications involving metals, many research studies are conducted in order to substitute conventional materials by reinforced metal matrix composites. These materials are developed using powder metallurgy processes with mechanical alloying. Therefore, reinforced micro/nanoscale dispersions are obtained by co-grinding metallic powders with oxide using several types of mill such as balls milling. The mill is a cylindrical tank whose rotation around its main axis generates the milling process, which is operated by the existing steel beads within the powder. The grinding results from different combinations of collisions between beads and powders on the tank walls. During this process, the characteristics of the powder such as the grain size or shape evolve and get stabilized after a given number of rotating cycles. It becomes then important to find a non-invasive way in order to quantify the grinding quality while processing. In this contribution we present experimental results corresponding to pulsed ultrasonic through-transmission characterization of metallic powders of different characteristics (FeAlZrCB and Fe3Cr1Mo0.5Mn0.2V). In particular, the ultrasonic bench has been calibrated using metal powders with different grain sizes (50-500 micrometers). Ultrasonic characterization is based on the coherent ballistic pulse and the speckle-like multiply scattered signal, which compose the transmitted signal.
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hal-00811036 , version 1 (23-04-2012)

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Laurianne Barguet, Mourad Bentahar, Charles Pezerat, Rachid El Guerjouma. Ultrasonic characterization of mechanical properties of metal powders. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00811036⟩
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