A STUDY ON THE EFFECT OF ANNEALING PROCESS ON SOUND VELOCITY AND INTERNAL FRICTION USING THE VIBRATING REED TECHNIQUE

P. K. Mukhopadhyay, Uday Kumar and Emad Badawi
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P. K. Mukhopadhyay: S. N. Bose National Centre for Basic Sciences, Calcutta, 700 098, India
Uday Kumar: S. N. Bose National Centre for Basic Sciences, Calcutta, 700 098, India
Emad Badawi: Physics Dept., Faculty of Science, El-Minia University, Egypt

Surface Review and Letters (SRL), 2004, vol. 11, issue 04n05, 451-455

Abstract: Alhas unique intrinsic characteristics, which are of interest to scientists as well as engineers.Aland its alloys are slightly paramagnetic materials.Alhas very low cross section for thermal neutrons of 0.23 barn, henceAlcan be used in nuclear fields as a structural material which is virtually transparent to neutrons. We report VRT as a new technique to study material problems. We also discuss, the results of sound velocity and internal friction, and resonance frequency as a function of temperature range for a pure aluminum sample under investigation. By using VRT, we found that the annealing temperature (450°C) is sufficient to remove the type of defects introduced in the materials under study. The activation energy to remove point defect forAlsamples was calculated and found to be about 0.0624 eV. Also, we could easily observe thatQ-1is a function of annealing time. From these measurements of sound velocity and internal friction we can conclude that VRT is a powerful tool for detecting and probing the physical properties of the material under study. Internal friction is a microscopic property for the indication of the purity of the sample. Sound velocity depends on the state of the materials (which depends on the process of treatment).

Keywords: Sound velocity; Vibrating Reed Technique; internal friction (search for similar items in EconPapers)
Date: 2004
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DOI: 10.1142/S0218625X04006384

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