Microstructures and Phase Formation of Refractory MoNbTaVZr High Entropy Alloy

Abstract:

Microstructures, component distribution and mechanical properties of a refractory high entropy alloy MoNbTaVZr were investigated by scanning electron microscope, X-ray diffractometer and universal testing machine, and the formation rule of second phases in as-cast alloy was discussed by the results of first principle calculations. The results show that as-cast MoNbTaVZr alloy is composed of two solid solutions with body centered cubic structure, together with Mo2Zr and an unknown phase. The chemical compositions of dendritic regions are relatively uniform, while Zr and V elements are rich in interdendritic regions. There is a short yielding phase when as-cast alloy was operated by the compression. According to calculations, the C15 Mo₂Zr Laves phase with the strongest formation ability and highest structural stability would be formed preferentially in MoNbTaVZr refractory high entropy alloy.

• Periodical: Materials Science Forum (Volume 993)
• Pages: 384-390
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.993.384
• Online since: May 2020
• Authors: Hao Yu Wang, Zi Yue Wang, Zhi Sheng Nong*, Ji Jie Wang, Tian Nan Man, Jing Chuan Zhu
• Keywords: First Principles Calculation, Formation Rule, Microstructure, MoNbTaVZr High Entropy Alloy

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