The Effect of Zirconium on Internal Friction in Columbium

Abstract

The effect of zirconium on internal friction in columbium was investigated over the frequency range of 0.5 to 10 cps. An entirely new peak was observed which was attributed to the diffusion of oxygen in the vicinity of zirconium atoms. The normal columbium oxygen peak was not observed until approximately 0.14 wt% oxygen was added to the specimens. The normal columbium-nitrogen peak was readily observed, but a zirconium-nitrogen peak was not observed until oxygen concentration was reduced below 0.1 wt%. These observations are explained on the basis of a strong attraction between zirconium and oxygen atoms. As a preliminary to this investigation, the diffusivity of zirconium in columbium at 1930°C was determined. A value for D0 and the activation energy were calculated so that the diffusivity at any temperature could be obtained from the expressionD=0.57 exp 87 000/RT.

Effect of impurities on mechanical relaxation in niobium

“…2, for Nb-0.08Zr-O alloy, the asymmetry continued to be evident. This corroborates the existence of more than one process of interaction, in conformity with the results of authors 4,9,10,17 .…”

“…The height, shape and temperature of these peaks depend on the concentration of interstitial and substitutional elements. The identification of the three con- 9 , and the identification of the Zr-O peak due to substitutional-interstitial interaction was based on results of several authors [10][11][12] . Assuming that the peaks are true Debye peaks, one can compute the activation energies (E) for the processes, measuring the width at half peak height, and considering that the peaks obey Arrhenius type equation, t = t 0 exp(E/RT p ), it is possible to calculate the Zr-O 483 --relaxation time (t 0 ) for each interaction process.…”

Dynamical Elastic Moduli of the Ti-13Nb-13Zr biomaterial alloy by mechanical spectroscopy

“…Zr, then the peak intensity decreases 18 . Besides, it was observed by other researchers in alloys containing Zr as substitutional element and D as interstitial atom, that the presence of substitutional elements affect the random distribution of the interstitial solute atoms in free solid solution and the anelastic relaxation process is observed only after the saturation of the stoichiometric ratio of D to Zr 9,19,20 . The dynamical elastic modulus for TNZ + WQ + 670 K/3 h sample was determined from flexural resonance frequency of fundamental tone of bar in clamped-free geometry using the Equation 3.…”

“…Ti-13Nb-13Zr alloy is typically an near-β Ti alloy which, when heat treated up the β-transus temperature and water-quenched posses a hexagonal α´-phase martensite microstructure, but followed by an aging treatment that is transformed into a martensite formed by α-phase (hcp structure) with precipitates of β−phase (bcc structure) [5][6][7] . In general it is of great interest to know in a metallic alloy the behavior of alloying elements and the mechanical properties, specifically the elastic modulus in biomaterials, therefore the mechanical spectroscopy becomes an important tool for characterization because it can provide information about the interaction of the matrix with the solutes atoms (substitutional and interstitial) [8][9][10][11] , besides dynamical elastic modulus (elastic modulus as function of temperature) 12 parameter of great importance from the viewpoint of biocompatibility.…”

Effect of interstitial impurities on internal friction measurements in niobium

“…The internal friction curves as a function of temperature would be decomposed into elemental Debye peaks [8] using the method of successive subtraction (in the present work, Peak Fitting Module of Origin was used), and the anelastic relaxation processes could be identified comparing our data with literature [9][10][11][12].…”