Prakash, O.Chandrakar, R.Chandraker, S.Rao, K.R.Kumar, R.Kumar, A.Dubey, V.2026-02-042022JOM, 2022, 74, 9, pp. 3329-333310474838https://doi.org/10.1007/s11837-022-05417-7https://idr.nitk.ac.in/handle/123456789/22426Refractory high-entropy alloys (RHEAs) are new types of material that have been developed for high-temperature applications. RHEAs should have enhanced high-temperature strength while maintaining a sufficient level of room-temperature toughness. The phase evolution of novel MoNbSiTiW RHEAs was investigated after mechanical alloying (MA) for 35 h. X-ray diffraction (XRD) was used to analyze the phase evolution, and analysis of particle morphologies was done using a scanning electron microscope (SEM) equipped with energy dispersive spectroscopy (EDS). XRD results indicate that NbMoSiTiW RHEAs with up to 10 h of mechanical alloying have a stable solid solution phase with body centered cubic (BCC) structure. Further milling of NbMoSiTiW RHEAs promotes the evolution of intermetallic compounds until 35 h of mechanical alloying. The Williamson-Hall process was incorporated for crystalline size and lattice strain measurement and the results show that, after 35 h of mechanical alloying, the crystalline size decreased from 298 nm to 25 nm, and an enhancement in lattice strain was observed from 0.1% to 0.65%. © 2022, The Minerals, Metals & Materials Society.Energy dispersive spectroscopyEntropyHigh temperature applicationsHigh-entropy alloysMechanical alloyingNiobium alloysParticle size analysisScanning electron microscopyTitanium alloysX ray diffractionCrystalline sizeHigh entropy alloysHigh temperature strengthHigh-temperature applicationLattice strainParticle morphologiesPhase analysisPhase evolutionsRoom temperature toughnessX- ray diffractionsCrystal structure