scholarly journals Internal friction and viscosity associated with mobile interstitials in the presence of a kink harmonically or uniformly moving in anisotropic body‐centered cubic metals

1984 ◽  
Vol 55 (8) ◽  
pp. 2857-2868 ◽  
Author(s):  
Tarik Ö. Ogurtani ◽  
Alfred K. Seeger
Keyword(s):  
Internal Friction ◽  
Anisotropic Body ◽  
Body Centered Cubic ◽  
Cubic Metals

Interstitial Diffusion of Oxygen in Tantalum Obtained by Anelastic Relaxation Measurements

2006 ◽  
Vol 258-260 ◽  
pp. 146-151
Author(s):  
Odila Florêncio ◽  
Geovani F. Barbosa ◽  
Paulo Sergio Silva ◽  
Tomaz Toshimi Ishikawa ◽  
Durval Rodrigues
Keyword(s):  
Internal Friction ◽  
Body Centered Cubic ◽  
Internal Friction Peak ◽  
Interstitial Diffusion ◽  
Cubic Metals ◽  
Relaxation Parameters ◽  
Relaxation Measurements ◽  
Solute Interaction ◽  
Temperature Activation

Anelastic relaxation measurements have been used in order to obtain information about several aspects of the behavior of solutes in metals, for example, matrix-solute interaction, interstitial diffusion, etc. The diffusion coefficient for interstitial solutes in body centered-cubic metals is accurately determined by anelastic relaxation measurements. The kind of preferential occupation of the interstitial solutes in body centered-cubic metals, such as oxygen and nitrogen in tantalum, is still controversial. Internal friction and frequency measurements as a function of temperature in tantalum sample were performed using a torsion pendulum operating in a frequency oscillation in the hertz bandwidth. These results presented the following phenomenon: the intensity of the internal friction peak decreased between the first run and the other runs. These results were decomposed, by the successive subtraction method, in elementary Debye peaks, for determination of characteristic anelastic relaxation parameters (relaxation strength, peak temperature, activation energy and relaxation time). Interstitial diffusion coefficients for oxygen in tantalum were determined, for different intensities of internal friction peaks, and when compared with literature, these results introduced a better adjustment for the tetrahedral preferential occupation sites of oxygen in tantalum.

Voids in Irradiated Tungsten and Molybdenum

1969 ◽  
Vol 27 ◽  
pp. 190-191
Author(s):  
Robert C. Rau ◽  
Robert L. Ladd
Keyword(s):  
Melting Point ◽  
Fast Neutron ◽  
Neutron Irradiation ◽  
Elevated Temperatures ◽  
Irradiation Temperature ◽  
The Body ◽  
Face Centered Cubic ◽  
Body Centered Cubic ◽  
Cubic Metals ◽  
Face Centered

Recent studies have shown the presence of voids in several face-centered cubic metals after neutron irradiation at elevated temperatures. These voids were found when the irradiation temperature was above 0.3 Tm where Tm is the absolute melting point, and were ascribed to the agglomeration of lattice vacancies resulting from fast neutron generated displacement cascades. The present paper reports the existence of similar voids in the body-centered cubic metals tungsten and molybdenum.

Effective interatomic potential for body‐centered‐cubic metals

1995 ◽  
Vol 78 (1) ◽  
pp. 122-126 ◽  
Author(s):  
Y. R. Wang ◽  
D. B. Boercker
Keyword(s):  
Interatomic Potential ◽  
Body Centered Cubic ◽  
Cubic Metals
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