Showing papers by "Andrej Atrens published in 1977"
TL;DR: In this article, a compilation and an analysis of data relating to oxygen diffusion in alpha-zirconium is presented, which spans the temperature range 290 to 1500°C and fourteen orders of magnitude in the diffusion coefficient.
101 citations
TL;DR: The model used by Fernandez and Povolo to analyze amplitude dependent and time dependent damping results in zirconium is not consistent with all of the experimental results as discussed by the authors.
70 citations
TL;DR: In this paper, the room temperature damping of three Fe•18Cr•Ni alloys was determined as a function of vibrational strain amplitude at 80 kHz, and the data are consistent with the Granato-Lucke theory of dislocation damping.
Abstract: The room‐temperature damping of three Fe‐18Cr‐Ni alloys was determined as a function of vibrational strain amplitude at 80 kHz. The data are consistent with the Granato‐Lucke theory of dislocation damping. Values of Lc (distance between minor pins) measured are consistent with those obtained from a thermodynamic analysis based on Suzuki locking. Hydrogen charging decreases both the damping and modulus defect, indicating that hydrogen pins dislocations in these alloys at room temperature. The pinning corresponds to four hydrogen atoms per 100 lattice atoms along the dislocation, and a hydrogen‐dislocation (Hd) binding energy of 0.14 eV. The origin of the Hd interaction lies in the elastic misfit interaction, Suzuki interaction, or combination of both. These estimates of H concentration at dislocations and Hd interaction energy are consistent with the observed release rate of hydrogen from H‐charged specimens undergoing plastic deformation.
23 citations
4 citations