Room temperature single crystal elastic constants of boron carbide

Single crystals of the high temperature ceramic boron carbide have been synthesized by the optical floating zone method. Room temperature elastic constants of a carbon-deficient boron carbide single crystal have been measured using the resonant ultrasound spectroscopy technique. Based upon density m...

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Bibliographic Details
Published in:Journal of materials science 2001-07, Vol.36 (14), p.3403-3407
Main Authors: MCCLELLAN, K. J, CHU, F, ROPER, J. M, SHINDO, I
Format: Article
Language:English
Subjects:
Armor
Bonding strength
Boron
Boron carbide
Condensed matter: structure, mechanical and thermal properties
Elastic anisotropy
Elastic properties
Elasticity, elastic constants
Exact sciences and technology
High temperature
Materials science
Mechanical and acoustical properties of condensed matter
Mechanical properties of solids
Modulus of elasticity
Physics
Poisson's ratio
Room temperature
Single crystals
Stoichiometry
Ultrasonic testing
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Summary:Single crystals of the high temperature ceramic boron carbide have been synthesized by the optical floating zone method. Room temperature elastic constants of a carbon-deficient boron carbide single crystal have been measured using the resonant ultrasound spectroscopy technique. Based upon density measurements, the single crystal stoichiometry was specified as B5.6C. This crystal has room temperature single crystal elastic constants of c11 = 542.81, c33 = 534.54, c13 = 63.51, c12 = 130.59, and c44 = 164.79 GPa, respectively. Analysis of Cauchy's relationships, Poisson's ratios, and elastic anisotropic factors for the single crystal elastic constants indicates that it is more strongly anisotropic in elasticity and interatomic bonding than most solids. Room temperature isotropic elastic moduli of boron carbide show that its bulk, shear and Young's moduli are substantially higher than those of most solids, so that boron carbide belongs to the so-called “strong solids”. Its Poisson's ratio is significantly lower than that of most solids.
ISSN:0022-2461
1573-4803
DOI:10.1023/A:1017947625784