Journal article
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
Acta materialia, v 54(10), pp 2757-2767
2006
Abstract
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.
Metrics
Details
- Title
- 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
- Creators
- M. Radovic - Oak Ridge National LaboratoryM.W. Barsoum - Drexel UniversityA. Ganguly - Drexel UniversityT. Zhen - Drexel UniversityP. Finkel - Drexel UniversityS.R. Kalidindi - Drexel UniversityE. Lara-Curzio - Oak Ridge National Laboratory
- Publication Details
- Acta materialia, v 54(10), pp 2757-2767
- Publisher
- Elsevier
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering; Mechanical Engineering and Mechanics
- Web of Science ID
- WOS:000238174500018
- Scopus ID
- 2-s2.0-33646536567
- Other Identifier
- 991019169419504721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary
- Metallurgy & Metallurgical Engineering