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Mechanical damping in porous Ti 3SiC 2
Journal article   Peer reviewed

Mechanical damping in porous Ti 3SiC 2

M. Fraczkiewicz, A.G. Zhou and M.W. Barsoum
Acta materialia, v 54(19), pp 5261-5270
2006
DOI: https://doi.org/10.1016/j.actamat.2006.06.052

Abstract

Kink bands Mechanical damping Porosity Ti 3SiC 2
The ternary compound Ti 3SiC 2 is the most studied of a family of machinable ternary carbides and nitrides, the so-called MAX phases. Those compounds, in turn, belong to a larger class of recently classified solids, kinking nonlinear elastic solids, because they deform mainly by the formation of regular and incipient kink bands. This kinking leads to exceptionally high damping properties, which are influenced by porosity. We report on a systematic study of the effect of porosity levels – ranging from 0 to 55 vol.% – on the damping properties of Ti 3SiC 2. The major effects of porosity are, first, a reduction in the threshold stress needed for kink band formation, a reduction that stems mostly from concomitant reductions in the shear moduli; and, second, a reduction in the ultimate compressive stresses. The presence of porosity does not greatly affect the specific damping capacity, which hovers around 0.15, at near the maximal stresses. It follows that porosity level, like grain size, becomes a useful microstructural variable that can be used to tune the stress level over which the damping is required.

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Web of Science research areas
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
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