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On the elastic properties and mechanical damping of Ti 3SiC 2, Ti 3GeC 2, Ti 3Si 0.5Al 0.5C 2 and Ti 2AlC in the 300–1573 K temperature range
Journal article   Peer reviewed

On the elastic properties and mechanical damping of Ti 3SiC 2, Ti 3GeC 2, Ti 3Si 0.5Al 0.5C 2 and Ti 2AlC in the 300–1573 K temperature range

M. Radovic, M.W. Barsoum, A. Ganguly, T. Zhen, P. Finkel, S.R. Kalidindi and E. Lara-Curzio
Acta materialia, v 54(10), pp 2757-2767
2006
DOI: https://doi.org/10.1016/j.actamat.2006.02.019

Abstract

Brittle-to-ductile transition Dislocations Kinking Loss factor Resonant ultrasound spectroscopy
In this paper we report on the temperature dependencies of Young’s, E, and shear moduli, μ, of polycrystalline Ti 3SiC 2, Ti 2AlC, Ti 3GeC 2 and Ti 3Si 0.5Al 0.5C 2 samples determined by resonant ultrasound spectroscopy in the 300–1573 K temperature range. For the isostructural 312 phases, both the longitudinal and shear sound velocities decrease in the following order: Ti 3SiC 2 > Ti 3Si 0.5Al 0.5C 2 > Ti 3AlC 2 > Ti 3GeC 2. Like other phases in the same family, these solids are relatively stiff and lightweight. The room temperature E values range between 340 and 277 GPa for Ti 2AlC to 340 GPa for Ti 3SiC 2; the corresponding μ values range between 119 and 144 GPa. Poisson’s ratio is around 0.19. Both E and μ decrease linearly and slowly with increasing temperature for all compositions examined. The loss factor, Q −1, is found to be relatively high and a weak function of grain size and temperature up to a critical temperature, after which it increases significantly. Modest (4% strain) pre-deformation of Ti 3SiC 2 at elevated temperatures results in roughly an order of magnitude increase in Q −1 as compared to as-sintered samples, which led us to the conclusion that the damping is due to the interaction of dislocation segments with the ultrasound waves. That Q −1 decreases with increasing strain amplitude is consistent with such an interpretation. The loss factors of the deformed Ti 3SiC 2 sample are orders of magnitude higher than those of typical structural ceramics. The technological implications of having readily machinable solids that have stiffnesses comparable to Si 3N 4 and damping capabilities comparable to some woods are obvious and are discussed.

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Domestic collaboration
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Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
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