The Bordoni peak in copper single crystals at megahertz frequencies

Niblett, Daniel; Zein, M.

doi:10.1088/0305-4608/10/5/008

Cited by 10 publications

(6 citation statements)

References 13 publications

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“…However, in comparison with extensive results obtained from studying the Bordoni peak in copper single crystal [9,[17][18][19] and in aluminium single crystal [10][11], one can believe that our conclusion is valid i.e. However, in comparison with extensive results obtained from studying the Bordoni peak in copper single crystal [9,[17][18][19] and in aluminium single crystal [10][11], one can believe that our conclusion is valid i.e.…”

Section: -Experimental Proceduresupporting

confidence: 59%

The bordoni peak in silver single crystals at megahertz frequencies

Zein

Alnaser

1993

Il Nuovo Cimento D

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The dislocation relaxation maximum has been investigated at frequencies of 5, 10 and 30 MHz. The three (very high-purity) silver crystals of crystallographic orientation (111), (110) and (100) which are given a resolved shear stress of 20 MPa were found to produce dislocation relaxation maximum at 107 K in all the three samples. The ma.xhnum shifts to 117K when measurement is carried out at 10 MHz and to 127 K at 30 MHz. The results reveal that the maximum is orientation independent. The activation energy and the attempt frequency were calculated and found to be equal to 0.105 eV and 2.109 Hz, respectively. Meanwhile the larger magnitude of the maximum was found on the (111) crystal and the least was on the (100) crystal. Finally, it was clearly shown that the dislocation relaxation strength decreases as the frequency increases. PACS 62.20 -Mechanics and rheology of solids. PACS 61.70.Le -Slip, creep, internal friction, and other indirect evidence of dislocations. PACS 43.35.Bg -Ultrasonic velocity, dispersion, scattering diffraction, and attenuation in liquids, liquid crystals, suspensions, and emulsion. PACS 62.40 -Anelasticity, internal friction, and mechanical resonances.

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Section: -Experimental Proceduresupporting

confidence: 59%

The bordoni peak in silver single crystals at megahertz frequencies

Zein

Alnaser

1993

Il Nuovo Cimento D

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“…But only a few works were devoted to the high MHz BP in copper. The most relevant ones are that by Niblett and Zein [3] for attenuation measurements at frequencies 30 MHz and the present authors [4] for frequencies up to 50 MHz and in the interval of temperatures from 77 to 300 K.…”

Section: Introductionsupporting

confidence: 50%

The ultrasonic Bordoni peak in copper crystals and the kink picture

Moreno-Gobbi¹,

Eiras

2000

J. Phys.: Condens. Matter

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The ultrasonic logarithmic decrement and modulus defect in high purity copper crystals was measured at 10, 30 and 50 MHz in the temperature interval 5-373 K. The samples were deformed at room temperature in the 3-20% range along the 111 crystallographic direction. The experimental data were fitted over the whole interval of temperatures, assuming the contribution of two kink mechanisms: (i) relaxation by kink pair formation with diffusion in the dislocation line and (ii) overdamped resonance of the kink chain with a temperature dependent number of kinks in the dislocation lines. With this procedure both primary and secondary properties of the high frequency Bordoni peak could be satisfactorily explained. Numerical data are reported for peak parameters and for the kink diffusion coefficient.

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“…Figure 2 presents the BP temperature versus sample deformation for frequencies 10± 50 MHz, obtained from this work (Moreno-Gobbi and Eiras 1993) in samples deformed by 3, 5 and 10%, and by Niblett and Zein (1980) for copper samples deformed by 1.9, 2.9 and 6%. Figure 2 presents the BP temperature versus sample deformation for frequencies 10± 50 MHz, obtained from this work (Moreno-Gobbi and Eiras 1993) in samples deformed by 3, 5 and 10%, and by Niblett and Zein (1980) for copper samples deformed by 1.9, 2.9 and 6%.…”

Section: E Ect Of Cold Workmentioning

confidence: 97%

“…INTRODUCTION Over 50 years ago, Bordoni (1949) observed a peak at low temperatures in the internal friction of some fcc cold-worked metals measured at frequencies of 1 MHz or less. The most important is due to Niblett and Zein (1980), where they reported attenuation measurements at frequencies of 30 MHz or less in copper. Later this peak was studied experimentally almost exclusively through internal-f riction measurements on a wide range of samples with di erent prior plastic deformations, amounts of cold work or crystal sources (Niblett 1966), but only a few papers were devoted to the high-f requency (megahertz) BP in copper.…”

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confidence: 99%

Experimental characterization of the Bordoni peak in copper using 10-50 MHz longitudinal ultrasonic waves

Moreno-Gobbi

2000

Philosophical Magazine A

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The logarithmic decrement and its associated modulus defect were obtained in the temperature range 77± 300 K, at frequencies 10± 50 MHz, in a crystalline sample deformed at room temperature by 20% along h111i. The well developed Bordoni peaks observed were compared with those obtained in similar samples deformed at room temperature between 3 and 10% along h111i and h110i, and a general characterization of the high-frequency Bordoni peak was realized. The main characteristics of this Bordoni peaks are, ® rstly, that the activation energy is 0.075 eV and, secondly, that the peak width is 30% greater than a Debye peak. These experimental properties appear to be in reasonable agreement with the theoretical predictions if kink di usion in dislocation lines is considered in the kink pair formation process.

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The Bordoni peak in copper single crystals at megahertz frequencies

Cited by 10 publications

References 13 publications

The bordoni peak in silver single crystals at megahertz frequencies

The bordoni peak in silver single crystals at megahertz frequencies

The ultrasonic Bordoni peak in copper crystals and the kink picture

Experimental characterization of the Bordoni peak in copper using 10-50 MHz longitudinal ultrasonic waves

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