TITLE

Ultrasonic characterization and temperature dependence of elastic properties of ductile ternary ceramics

AUTHOR(S)
Finkel, P.; Barsoum, M. W.; El-Raghy, T.
PUB. DATE
May 2000
SOURCE
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p1501
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Measurements of temperature dependence of sound velocity provide valuable information about the elastic properties, microstructure, bond strength and stability of the materials. The materials studied here are a family of structurally related, layered ternary carbides and nitrides of the types Ti3BX2 and Ti4BX3 with B==S, Al, X==C, N. This class of compounds posses an unusual combination of thermal and mechanical properties. With Vicker’s hardness values that range between 3 and 5 GPa, they are relatively soft for carbides and nitrides, and are readily machinable (similar to graphite). The mechanical behavior of these ceramics can be attributed to the relative weakness, particular in shear, of the Ti-Si bonds. The elastic constants and their temperature dependencies have been measured in the temperature range 50–300K using the phase sensitive ultrasonic technique. The room temperature values of the Young’s and shear moduli obtained from the pulse-echo method agree well with the resonant ultrasonic spectroscopy results. The Debye temperatures for all compounds, estimated from the elastic constants, are found to be consistent with values calculated from heat capacity measurements. © 2000 American Institute of Physics.
ACCESSION #
6029228

 

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