Microstructural Analysis of MoNbZrTiV Refractory High-Entropy Alloy Developed via High-Energy Mechanical Alloying

RefractoryRefractory high-entropy alloysHigh entropy alloys (RHEAs) are an emerging group of materialsMaterials exhibiting interesting functional and structural properties under high-temperatureHigh temperature operations. In this work, MoNbZrTiVMoNbZrTiV RHEA particles were developed via high-energy mechanical alloyingMechanical alloying, employing sequential and conventional milling approaches. Microstructural analysis was done through scanning electron microscopy, and the corresponding energy-dispersive X-ray spectroscopy confirmed the successful formation of the alloy. Results showed that as the milling progressed, dissolution of the elements and homogenization of the alloy were greatly governed by the physical properties of the elements. Thermodynamic calculations predicted the formation of a solid solutionSolid solution with a body-centered cubic (BCC) crystal structureStructure. The reduced particle size after 24 h of milling was mainly due to the brittle nature of the elements having BCC and hexagonal close-packed (HCP) crystal structuresStructure, in addition to strain hardening and the frequent tendency of fracturing than cold welding during milling.