Effect of Al Content on Microstructure and Properties of AlxMoNbTiV RCCA’s Alloys

Abstract:

The objective of this study is the evaluation of high entropy alloys for aeroengines applications up to 1000°C. Al_xNbMoTiV alloys with 10 and 20 at.% Al have been produced by arc melting. As-cast microstructure and phase transformations during heat treatments have been investigated through SEM, DRX and TEM, revealing the possibility of homogenization at 1400°C and the stability of the BCC structure at 1000°C and 800°C for both alloys. Mechanical properties have been evaluated through micro-hardness and compression tests up to 800°C. It appears that, although both alloys show a similar microstructure and hardness evolution with heat treatment, the Alloy containing 10 at.% of Al show a higher yield strength at room temperature and 800°C, related to the brittle character of the alloy containing 20 at.% of Al.

• Periodical: Materials Science Forum (Volume 941)
• Pages: 1111-1116
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.941.1111
• Online since: December 2018
• Authors: Antoine Lacour-Gogny-Goubert, Zhao Zhao-Huvelin, Agnès Bachelier-Locq, Ivan Guillot, Anne Denquin*
• Keywords: Compositionally Complex Alloys, Heat Treatment, High Entropy Alloys, Mechanical Properties, Microstructure, Refractory Alloys, Scanning Electron Microscopy, Transmission Electron Microscopy, X-Ray-Diffraction

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