Creep behavior of TiCxN1−x-CoTi cermets synthesized by mechanically induced self-sustaining reaction |
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Authors: | A Morales-Rodríguez A Gallardo-LópezA Domínguez-Rodríguez JM CórdobaMA Avilés FJ Gotor |
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Affiliation: | a Departamento de Física de la Materia Condensada, Universidad de Sevilla, Box 1065, 41080 Sevilla, Spain b Instituto de Ciencia de Materiales de Sevilla, CSIC-USE, Avda. Américo Vespucio 49, 41092 Sevilla, Spain |
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Abstract: | The plastic flow of TiCxN1−x-CoTi cermets has been investigated by uniaxial compression tests carried out in argon atmosphere at temperatures between 1100 and 1200 °C. Two different cermets, with 5 wt.% W or WC content as sintering additives, have been explored to assess the influence of the sintering additives on creep. The microstructural observations of deformed samples and the mechanical results indicate that the hard phase (ceramic grains) controls the plastic deformation. The stress exponent changes from 1 to 2 with increasing strain rate, suggesting a transition in the deformation mechanism from diffusional creep to grain boundary sliding; both with similar activation energy values of about 400 kJ/mol. This value of activation energy agrees with C diffusion in the carbonitride grains as the strain rate controlling mechanism. |
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Keywords: | B Composites C Mechanical properties C Creep E Cutting tools Carbonitrides |
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