On the Deformation Induced Internal Friction Peaks in Niobium

✍ Scribed by R. De Batist

• Publisher: John Wiley and Sons
• Year: 1963
• Tongue: English
• Weight: 298 KB
• Volume: 3
• Category: Article
• ISSN: 0370-1972
• DOI: 10.1002/pssb.19630030820

✦ Synopsis

Abstract

The activation energies and attempt frequencies for the deformation induced damping peaks in niobium are determined. For the α peak these are found to be 0.28 ± 0.01 eV and (2.8 ± 1.8) 10^12^s^−1^ from the variation of peak temperature with frequency and using all experimental data presently available. For the β peak, these parameters are estimated using strain recovery experiments performed during the warm‐up after plastic deformation at liquid nitrogen temperature. A value of 0.51 eV is found for 10^12^ s^−1^ and 0.48 eV for 10^11^ s^−1^, to be compared with values of 0.47 eV and about 10^11^ s^−1^ obtained by CHAMBERS and SCHULTZ from the shift of peak temperature with frequency. The width of the α peak is shown to be consistent with a relaxation process having a single attempt frequency, and a distribution of activation energies. Assuming a square distribution of width Δ__H__ about H, it is found that Δ__H__|H ≈︁ 0.10.