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Rao, G. V. S. Nageswar
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article
Densification, Microstructural Evolution, Mechanical Properties and Oxidation Study of CrB2 + EuB6 Composite
Abstract
<p>This paper reports the results of investigation on densification, microstructural evolution, mechanical properties and oxidation study of CrB<sub>2</sub> + EuB<sub>6</sub> composite. CrB<sub>2</sub> + EuB<sub>6</sub> (10 and 20 wt.%) composites have been fabricated by hot pressing at a temperature of 1700 °C and 35 MPa pressure. The hardness and flexural strength were measured in the range of 21.25-24.48 GPa and 171-199 MPa, respectively. The fracture toughness increased from 3.3 to 4.01 MPa m<sup>1/2</sup> by the addition of 20% EuB<sub>6</sub>. Microstructural evolution revealed the uniform distribution of EuB<sub>6</sub> and absence of any reaction product. Fracture surface analysis confirmed the presence of transgranular mode of fracture. Oxidation study at 1200 °C revealed that the developed composites have good oxidation resistance and followed the parabolic rate of oxidation.</p>