Abstract: This study focuses on synthesizing and characterizing mech. alloyed refractory high entropy alloys (RHEA) containing TiMoNb, Cr, W, and Cr + W.Anal. techniques including XRD, SEM, EDX, DTA, and TGA were employed to explore the influence of Cr and W on the alloys′ structure, morphol., and thermal stability towards oxidationXRD anal. confirmed the formation of a single-phase bcc solid solution in TiMoNbCr, TiMoNbW, and TiMoNbCrW alloys.Crystallite size decreased as milling progressed, yielding average sizes of approx. 7.2 nm, 7.4 nm, and 9.7 nm, with lattice strains of 1.143%, 1.148%, and 1.15%, resp.Both exptl. and calculated values of lattice parameters converged to around 3.1685 ± 0.002 and 3.1791 ± 0.010 Å for all three alloys.The synergy of Cr and W in TiMoNb was observed for the first time, impacting dislocation d., hardness, and oxidation stability.TiMoNbCrW exhibited reduced dislocation d. and the highest hardness (502 HV).TGA indicated enhanced oxidation resistance up to 400 °C for TiMoNbCrW compared to the most vulnerable TiMoNbCr alloy.