Abstract
In this paper, the effect of substitutional Mo amounts in internal friction and interstitial diffusion mechanisms was analyzed in Ti-15Zr-based alloys. Mechanical spectroscopy was obtained from room temperature up to 730 K with frequencies between 1 Hz and 40 Hz. Internal friction spectra were composed by anelastic relaxation peaks in β-type alloys (metastable and stable), due to stress-induced ordering of oxygen and nitrogen interstitially in octahedral sites of the bcc crystalline structure. Peak decomposition analysis exhibited interactions between matrix-interstitial (Ti-O and Ti-N), substitutional-interstitial (Zr-O, Mo-O and Mo-N), and clusters (Ti-O-O and Zr-O-O). The diffusion results showed that the introduction of Mo facilitates the diffusion of interstitial elements in the metallic matrix.
Highlights
Mechanical spectroscopy is a useful tool for studying the interaction of gases in metals due to anelastic behavior of metallic materials
The purpose of this paper is to investigate the internal friction and diffusion mechanisms of interstitial elements in Ti-15Zr-xMo (x = 0, 5, 10, 15 and 20 wt%) alloys to verify the importance of alloying elements in influencing the anelastic behavior of the alloy
Diffusion parameters were obtained from the internal friction data, following procedures detailed in the literature[11], and using crystalline structural parameters obtained by XRD measurements in previous reports (Table 1)[10]
Summary
Mechanical spectroscopy is a useful tool for studying the interaction of gases in metals due to anelastic behavior of metallic materials. The anelastic relaxation effect is mainly produced by the movements of atoms such as oxygen, carbon, hydrogen, and nitrogen around interstitial sites (tetrahedral or octahedral symmetries) 1. This effect can be induced by mechanical stress, producing a peak in the internal friction spectrum of the material (Q-1). Where ω is the oscillatory frequency and τ the relaxation time. In the case of thermally-activated processes, the relaxation time assumes Arrhenius-type dependence with the temperature 3: x x0 exp S E kT X (2). With τ0 being the fundamental relaxation time, E the activation energy, and k the Boltzmann constant
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