Journal of Research of the National Bureau of Standards
The temperature dependence of both Young's and shear modulus of four types of cermet specimens, known as nickel-bonded titanium carbide, as well as Ni and TiC have been determined by a dynamic resonance method. The Young's modulus temperature curves of the cermets are characterized by a linear decrease from room temperature until about 700 to 1,000�C. In this upper temperature region, an inflection in the relation develops, accompanied by an increase in internal friction. Both these effects are attributed to viscous grain boundary slip. For shear modulus, only the linear portion of the modulus temperature relation was obtained. In this linear region, the relative decrease in shear modulus for the cermet specimens is greater than the relative decrease in Young's modulus for the same type of specimen. This means that Poisson's ratio rises with temperature for the cermets.
J. Res. Nat. Bur. Stand., Sec. C: Eng. Instr., Vol. 65C, No. 2, p. 89
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