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Nanocrystalline Mg-Matrix Composites with Ultrahigh Damping Properties
Conference paper

Nanocrystalline Mg-Matrix Composites with Ultrahigh Damping Properties

Babak Anasori, Shahram Amini, Volker Presser and Michel Barsoum
Magnesium Technology 2011, pp 463-468
28 Feb 2011
DOI: https://doi.org/10.1002/9781118062029.ch87

Abstract

Damping Exhibitions Infiltration Magnesium Melts Nanocomposites Nanocrystals Nanostructure
Recently, we reported on the processing of 50 vol.% Ti(2)AlC- nanocrystalline magnesium, nc-Mg, matrix composites using a pressureless melt infiltration method. Herein we report on composites with up to 80 vol.% Mg. These composites are readily machinable, relatively stiff, strong and light, and exhibit ultrahigh damping. Increasing the nc-Mg volume fraction leads to lighter composites with higher damping characteristics at lower stresses (~30% of the mechanical energy is dissipated at 250 MPa). In some cases, the Mg nanograins are also extraordinarily thermally stable, which renders these composites good candidates for applications at temperatures higher than ambient. Due to the simple inexpensive melt infiltration technique used to fabricate these novel nanocomposites, it is possible to produce samples as large as ones made via normal powder metallurgy methods.

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Metallurgy & Metallurgical Engineering
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