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A comprehensive study of selected properties of four (TiZrNbCu)_1-xNi_x (x\le 0.25) amorphous high entropy alloys (a-HEA) has been performed. The sampleswere ribbons about 20 \mum thick and their fully amorphous state was verifiedby X-ray diffraction and thermal analysis. The surface morphology, precisecomposition and the distribution of components were studied with a Scanningelectron microscope (SEM) with an energy dispersive spectroscopy (EDS)attachment. The properties selected were the melting temperature (T_m), the lowtemperature specific heat (LTSH), the magnetic susceptibility \chi_exp and theYoung^,s modulus (E). Whereas LTSH and \chi_exp were measured for the as-castsamples, E was measured both for as-cast samples and relaxed samples (after ashort anneal close to the glass transition temperature). The LTSH showed thatthe electronic density of states at the Fermi level, N_0(E_F), decreases withincreasing x, whereas the Debye temperature (\theta_D) increases with x. Thisis similar to what is observed in binary and ternary amorphous alloys of earlytransition metals (TE) with late transition metals (TL) and indicates thatN_0(E_F) is dominated by the d-electrons of the TE. The LTSH also showed theabsence of superconductivity down to 1.8K and indicated the emergence of theBoson peak above 4K in all alloys.The free-electron like paramagneticcontribution to \chi_exp also decreases with x, whereas E, like \theta_D,increases with x, indicating enhanced interatomic bonding on addition of Ni.The applicability of the rule of mixtures to these and other similar HEAs isbriefly discussed.

Electronic structure and properties of (TiZrNbCu)_1-xNi_x high entropy amorphous alloys