Microstructure of Nb-Ta-V Based Hydrogen Permeation High Entropy Alloys

Abstract:

High-entropy alloys of NbTaVTiNi, NbTaVTiCo, NbTaVHfCo, NbTaVHfNi, and NbTaVZrNi were synthesized by vacuum arc melting. The crystal structure was identified by an X-ray diffractometer analysis. Microstructures and element composition of the resulting alloys were investigated using a scanning electron microscope equipped with an energy dispersive X-ray spectrometer. All alloys presented the dendritic structure which is mainly composed of body-centered cubic (NbTaV,X) (X=Ti, Hf, Zr) phases and eutectic-like phases such as TiNi, TiCo, HfCo, HfNi and ZrNi. (NbTaV,X) phases take the function of hydrogen permeability while eutectic-like phases bear the responsibility of resistance to hydrogen embrittlement. Taking the microstructure of alloys into account, NbTaV-based high entropy alloys is appropriate for improving hydrogen permeability.

• Periodical: Materials Science Forum (Volume 849)
• Pages: 3-7
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.849.3
• Online since: March 2016
• Authors: Nai Juan Wang, Yuan Liu
• Keywords: High Entropy Alloys, Hydrogen Permeability, Microstructure, NbTaV-Based

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