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Microstructural and Mechanical Investigations in the Solution Annealing Heat Treatment of AlMo0.5NbTa0.5TiZr Refractory High-Entropy Alloy

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Abstract

This paper reports the effect of the solution annealing heat treatment process on the microstructure evolution, hardness changes, and creep behavior of high-entropy refractory alloy (RHEA) AlMo0.5NbTa0.5TiZr. Solution annealing was performed on the as-cast samples in the temperature range (1400-1550) °C for 24 h. Observations showed that the alloy consists of a dendritic structure such that a dual body-centered cubic (BCC)/B2 matrix (dendritic region) is surrounded by Al-Zr-rich intermetallic phases (inter-dendritic region). The significant tendency of Zr in respect of separation from the matrix was found as the main reason for the causing thermal instability. The results showed that with the increase in heat treatment temperature, the volume fraction of inter-dendritic phases decreases and causes a decrease in hardness. It is also the microstructure of the alloy adjacent to the creep indentation process verified that no significant phase deformation takes place in the area beneath the indenter face; while, an obvious phase compression besides the indenter edge was evident for severe shear stresses at this area. Using the constitutive equations, the stress exponent and activation energy of the creep were determined as ~ 141 and 1233 kJ/mol, respectively. The abnormal value of stress exponent was attributed to the lattice distortion, nano-scaled structure, ordered B2 phase, and Al-Zr intermetallic phase, all restricting the dislocation glide in the alloy.

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  1. Department of Materials Science and Engineering, Amirkabir University of Technology, Tehran, Iran

    Mehdi Soltanalinezhad, Hamid Omidvar & Ali Farzadi

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  1. Mehdi Soltanalinezhad
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Soltanalinezhad, M., Omidvar, H. & Farzadi, A. Microstructural and Mechanical Investigations in the Solution Annealing Heat Treatment of AlMo0.5NbTa0.5TiZr Refractory High-Entropy Alloy. J. of Materi Eng and Perform (2024). https://doi.org/10.1007/s11665-024-09480-w

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