Effect of heavy interstitials on anelastic properties of Nb-1.0 wt% Zr alloys

Diffusion of Interstitial Elements in Ti Alloys Used as Biomaterials

“…The mechanical properties of this alloy are directly related to its microstructure and the interstitial elements concentration. The addition of interstitial elements in these metals leads to strong alterations in their mechanical properties, causing, for example, their softening or hardening [4]. Therefore, determining the behavior of these interstitial elements is extremely important for the development of such materials.…”

Influence of solution-aging treatment on damping and tensile properties of Ti-36Nb-2Ta-3Zr-0.3O alloy

“…This may relate to the interaction between substitutional and interstitial atoms, especially the Zr-O atom clusters. It makes the higher energy barrier for oxygen atoms to overcome when jumping in the adjacent octahedral interstice [30]. Compared with damping alloys such as Ti-35.34Ni-11.16Cu-7Nb (at.-%) alloy [24], Ti-11Zr-47Cu-8Ni (at.-%) alloy [25] and Ti-3Mo-20Sn (at.-%) alloy [31] with a peak temperature at 307 K, 238 K and 235 K, respectively, the Ti-36Nb-2Ta-3Zr-0.3O alloy with a higher peak temperature around 514 K has a chance to be used at a relatively higher temperature environment.…”

“…When damping peak can be described by Debye expression for a single relaxation process, the w can be expressed as [4] For alloy aged at 713 K (1.0 Hz), the theoretical peak width is 36 K, while the experimental value is 126 K. This phenomenon also exists in the solution-treated alloy and other aged alloys, indicating that the damping peak is composed by more than one relaxation process [32]. Previous studies have shown that the complex relaxation peak can be explained by a superposition of several Debye peaks and the peak-fitting formula can be written as [13,30] in which Q −1 is the damping capacity (that is the tan δ ), T is the peak temperature, H is the activation energy, k is the Boltzmann constant, f is the vibration frequency, and i represents each Debye peak. The damping peaks of the Ti-36Nb-2Ta-3Zr-0.3O alloy with and without aged at 713 K are decomposed into six elementary peaks (Ta-O, Nb-O, Nb-O-O, Ti-O, Ti-O-O, Zr-O), corresponding to stress-induced reorientation of single or pairs of interstitial oxygen atoms in octahedral sites around matrix atoms or substitutional atoms using the peak-fitting modulus of the Microcal Origin ® software, as shown in Figure 6.…”

“…For instance, the Zr-O relaxation peak located at 556 K is attributed to the stress-induced reorientation of interstitial oxygen atoms around substitutional Zr atoms. Since the chemical affinity between Zr atoms and O atoms is pretty high [30], the damping capacity of the Zr–O peak is relatively high, although the concentration of the Zr element is relatively low. Each elementary Debye peak possesses different activation energies and peak temperatures, resulting in the widening of the experimental damping peak.…”

“…For alloy aged at 713 K (1.0 Hz), the theoretical peak width is 36 K, while the experimental value is 126 K. This phenomenon also exists in the solution-treated alloy and other aged alloys, indicating that the damping peak is composed by more than one relaxation process [32]. Previous studies have shown that the complex relaxation peak can be explained by a superposition of several Debye peaks and the peak-fitting formula can be written as [13,30]…”