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Title: On the Elastic Properties and Mechanical Damping of Ti 3SiC 2, Ti 3GeC 2, TiSi 0.5Al 0.5C 2 and Ti 2AlC, in the 300-1573 K Temperature Range

Abstract

In this paper we report on the temperature dependencies of Young's, E, and shear moduli, {mu}, of polycrystalline Ti3SiC2, Ti2AlC, Ti3GeC2 and Ti3Si0.5Al0.5C2 samples determined by resonant ultrasound spectroscopy in the 300-1573K temperature range. For the isostructural 312 phases, both the longitudinal and shear sound velocities decrease in the following order: Ti3SiC2>Ti3Si0.5Al0.5C2>Ti3AlC2>Ti3GeC2. Like other phases in the same family, these solids are relatively stiff and lightweight. The room temperature E values range between 340 and 277GPa for Ti2AlC to 340GPa for Ti3SiC2; the corresponding {mu} values range between 119 and 144GPa. Poisson's ratio is around 0.19. Both E and {mu} 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 Ti3SiC2 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 lossmore » factors of the deformed Ti3SiC2 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 Si3N4 and damping capabilities comparable to some woods are obvious and are discussed.« less

Authors:
 [1];  [2];  [2];  [2];  [3];  [2];  [1]
  1. ORNL
  2. Drexel University
  3. Thomson TTW R&D Center
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); High Temperature Materials Laboratory
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
931617
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Acta Materialia; Journal Volume: 54; Journal Issue: 10
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ELASTICITY; DAMPING; YOUNG MODULUS; TITANIUM CARBIDES; SILICON CARBIDES; ALUMINIUM CARBIDES; GERMANIUM CARBIDES; POISSON RATIO

Citation Formats

Radovic, Miladin, Barsoum, M W, Ganguly, A, Zhen, T, Finkel, P., Kalidindi, S R, and Lara-Curzio, Edgar. On the Elastic Properties and Mechanical Damping of Ti3SiC2, Ti3GeC2, TiSi0.5Al0.5C2 and Ti2AlC, in the 300-1573 K Temperature Range. United States: N. p., 2006. Web. doi:10.1016/j.actamat.2006.02.019.
Radovic, Miladin, Barsoum, M W, Ganguly, A, Zhen, T, Finkel, P., Kalidindi, S R, & Lara-Curzio, Edgar. On the Elastic Properties and Mechanical Damping of Ti3SiC2, Ti3GeC2, TiSi0.5Al0.5C2 and Ti2AlC, in the 300-1573 K Temperature Range. United States. doi:10.1016/j.actamat.2006.02.019.
Radovic, Miladin, Barsoum, M W, Ganguly, A, Zhen, T, Finkel, P., Kalidindi, S R, and Lara-Curzio, Edgar. Sun . "On the Elastic Properties and Mechanical Damping of Ti3SiC2, Ti3GeC2, TiSi0.5Al0.5C2 and Ti2AlC, in the 300-1573 K Temperature Range". United States. doi:10.1016/j.actamat.2006.02.019.
@article{osti_931617,
title = {On the Elastic Properties and Mechanical Damping of Ti3SiC2, Ti3GeC2, TiSi0.5Al0.5C2 and Ti2AlC, in the 300-1573 K Temperature Range},
author = {Radovic, Miladin and Barsoum, M W and Ganguly, A and Zhen, T and Finkel, P. and Kalidindi, S R and Lara-Curzio, Edgar},
abstractNote = {In this paper we report on the temperature dependencies of Young's, E, and shear moduli, {mu}, of polycrystalline Ti3SiC2, Ti2AlC, Ti3GeC2 and Ti3Si0.5Al0.5C2 samples determined by resonant ultrasound spectroscopy in the 300-1573K temperature range. For the isostructural 312 phases, both the longitudinal and shear sound velocities decrease in the following order: Ti3SiC2>Ti3Si0.5Al0.5C2>Ti3AlC2>Ti3GeC2. Like other phases in the same family, these solids are relatively stiff and lightweight. The room temperature E values range between 340 and 277GPa for Ti2AlC to 340GPa for Ti3SiC2; the corresponding {mu} values range between 119 and 144GPa. Poisson's ratio is around 0.19. Both E and {mu} 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 Ti3SiC2 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 Ti3SiC2 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 Si3N4 and damping capabilities comparable to some woods are obvious and are discussed.},
doi = {10.1016/j.actamat.2006.02.019},
journal = {Acta Materialia},
number = 10,
volume = 54,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}