Internal Friction of KCl Crystals at Low Temperatures
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概要
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Ultrasonic attenuation in megacycle range for cold-worked and for quenched KCl crystals has been measured against temperature between 200°K and room temperature. A very broad relaxation band appears below 240°K for cold-worked crystals. The experiments on the anisotropy of attenuation in crystals cold-worked by uniaxial compression demonstrate that the attenuation is caused by the motion of the dislocations. The activation energy is found to be 0.44eV. Quenched crystals show also a similar band. The following are very unique features: As quenching temperature is raised the attenuation band shifts to higher temperature. This shift is accompanied by the increase of the activation energy. Another significant nature is the ageing effect, which results also a band-shift to higher temperature with increasing ageing time after quenching. It has been discussed that the effects of vacancies in the dislocation core upon the activation energy for the motion of dislocations and the concurrent motion of vacancies in the cores of oscillating dislocations both give rise to such a broad band as observed.
- 社団法人日本物理学会の論文
- 1959-06-05
著者
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Suzuki Taira
The Research Institute For Iron Steel And Other Metals
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Suzuki Taira
The Research Institute For Iron Steel And Other Metals Tohoku University:(present)institute For Soli
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SUZUKI Katsumi
The Research Institute for Iron, Steel and Other Metals, Tohoku University
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KAMIGAKI Tomoo
The Research Institute for Iron, Steel and Other Metals, Tohoku University
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Kamigaki Tomoo
The Research Institute For Iron Steel And Other Metals Tohoku University
関連論文
- On the Nature of Preston-Guinier Atom-Groups in an Age-hardened Aluminium-Copper Alloy : Part I. Experimental
- Dislocation Networks in Crystals
- A Theory of Slip-Band Formation and Work-Hardening in Face-Centred Cubic Metal Crystals
- On the Nature of Preston-Guinier Atom-Groups in an Age-hardened Aluminium-Copper Alloy : Part II. Theoretical
- The Release of Energy Associated with Crystal Restoration Process in Cold-Worked Polycrystalline Copper
- Anelasticity of Ferromagnetics : Magneto-Elastic Relaxation in Nickel
- Internal Friction of KCl Crystals at Low Temperatures
- Influence of Order-Disorder on Creep of a Superlattice Alloy