Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7989812 | International Journal of Refractory Metals and Hard Materials | 2018 | 23 Pages |
Abstract
There is a clear need for high-strength (â¥Â 300 MPa), thermally stable, conductive materials that are also thermal shock resistant. Some MAX phases - ternary nano-laminated carbides and nitrides - are reported to fulfil all these requirements and can be considered as potential structural materials for high-temperature applications. In this work, a set of quaternary (M,Mâ²)AX phase materials based on the Nb-Al-C system were synthesized by reactive hot pressing, starting from M-hydride powders. The possibility to substitute Nb with at least 10 at% of other M elements (Mâ²Â = Ti, Zr, Hf and Ta) in the crystal lattice was investigated. The crystal structure of the produced solid solutions was studied by X-ray diffraction and the lattice parameters were calculated by Rietveld refinement. The material behaviour in an inert atmosphere was tested by measuring the elastic properties - Young's Modulus and internal friction - as a function of temperature up to 1500 °C, and the effect of the substitution on the room temperature flexural strength was assessed.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
T. Lapauw, A.K. Swarnakar, B. Tunca, K. Lambrinou, J. Vleugels,