Abstract
The effect of the addition of 25 at. % tantalum as substitutional solute on the internal-friction spectrum of niobium containing oxygen and nitrogen as interstitial solutes has been studied at a frequency of 1 Hz. Tantalum has been chosen because it hasa) the same atomic size,b) higher shear modulus,c) about the same chemical affinity towards nitrogen andd) higher chemical affinity towards oxygen than niobium. The relaxation spectrum of the alloy contains two main peaks, which correspond to the oxygen and nitrogen Snoek peaks in unalloyed niobium, and consist of four and two constituent peaks respectively. The additional peaks arise from relaxation processes caused by stress-induced reorientation of oxygen and nitrogen atoms in the neighbourhood of tantalum atoms. Since there is no difference in the atomic diameters of niobium and tantalum atoms, the associated activation energies for the relaxation processes causing the additional peaks are affected by the differences in their shear moduli and their chemical affinities towards oxygen and nitrogen.
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