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Mechanochemically synthesized NbC cermets: Part II. Mechanical properties

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Abstract

The mechanical behavior of mechanochemically synthesized NbC cermets was investigated. Material hardnesses range from a high of 19.6 GPa for as-synthesized cermets containing about 4 vol% of Fe to a low of about 4 GPa for heat-treated cermets containing about 34 vol% Cu. Higher hardness generally correlates with lower fracture toughness (about 2 MPa m1/2 for cermets containing the highest percentage of NbC) and vice versa. Highest fracture toughness (about 7.5 MPa m1/2) is found in NbC–18 vol% Fe cermets heat treated extensively following consolidation. Abnormally low fracture toughnesses are found in high-Cu-content cermets in which Cu segregation takes place during heat treatment. Current models of ceramic toughening can be applied to describe the fracture behavior of NbC–Fe cermets.

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Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, Michigan Technological University, Houghton, Michigan, 49931, USA

    B. R. Murphy & T. H. Courtney

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  1. B. R. Murphy
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  2. T. H. Courtney
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Murphy, B.R., Courtney, T.H. Mechanochemically synthesized NbC cermets: Part II. Mechanical properties. Journal of Materials Research 14, 4285–4290 (1999). https://doi.org/10.1557/JMR.1999.0580

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  • DOI: https://doi.org/10.1557/JMR.1999.0580

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