Relaxation effects in solid solutions arising from changes in local order. II. Theory of the relaxation strength

LeClaire, A. D.; Lomer, W.M.

doi:10.1016/0001-6160(54)90026-7

Cited by 90 publications

(13 citation statements)

References 6 publications

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“…It is simply assumed that the application of a stress changes the local or shortrange order in a particular direction. This approach was originally considered by LeClaire and Lomer [4] and more recently by Welch and LeClaire 151 in their studies of the relaxation strength. Further, it is assumed that the stress produces a population difference in bonds oriented in one direction compared to those in another.…”

Section: Introductionmentioning

confidence: 99%

Zener Relaxation in Silver Solid Solutions

Williams

Turner

1968

Physica Status Solidi (b)

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Employing a torsion pendulum and elastic-after-effect apparatus, activation energies for Zener relaxation in 10.8 and 18.1 atyo I n in Ag were found to be 35.1 and 33.4 kcal/mol respectively. These results and the diffusion data of Schoen were used in conjunction with a theory taking into consideration pair dissociation as well as reorientation. Activation energies for atomic reorientation of 34.5 and 31.0 kcal/mol respectively were deduced for these same concentrations. Zener relaxation was also observed in 8.1 atyo Sn in Ag and 6.3 a t Yo Sb in Ag for which the activation energies were measured to be 31.5 and 32.5 kcal/mol respectively. Durch Messungen mit einem Torsionspendel und mit Hilfe der elastischen Nachwirkung wurden die Aktivierungsenergien fur die Zener-Relaxation in In-Ag Legierungen zu 35,l und 33,4 kcal/Mol fur 10,8 bzw. 18,l atyo In in Ag bestimmt. Diese und die Diffusionsergebnisse von Schoen werden mit einer Theorie diskutiert, die eine Umorientierung von Paaren und auch eine Paardissoziation berucksichtigt. Fur die oben angegebenen Konzentrationen werden Aktivierungsenergien fur eine atomare Umordnung von 34,5 bzw. 31 ,O kcal/Mol abgeleitet. Eine Zener-Relaxation bei 8,l und 6,3 atyo Sb in Ag mit Aktivierungsenergien von 31,5 bzw. 32,5 kcal/Mol wurde ebenfalls beobachtet.

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Section: Introductionmentioning

confidence: 99%

Zener Relaxation in Silver Solid Solutions

Williams

Turner

1968

Physica Status Solidi (b)

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“…The peak height is linearly dependent on the product C& CLg as predicted for Zener relaxation according to the model of Leclaire and Lomer [5], 3. The temperature a t which the maximum is situated is sensitive to a variation in the concentration of lattice vacancies.…”

Section: Discussionmentioning

confidence: 81%

Concentration Dependence of Internal Friction in AlMg Alloy

Belson

Lemercier

Moser

et al. 1970

Physica Status Solidi (b)

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An internal friction peak in a series of Al-Mg alloys containing up to 12.1 wtyo Mg has been studied at torsional frequencies in the range 0.4 to 98 Hz. The temperature a t which the maximum occurred was found to vary according to the Arrhenius equation with an activation energy of 1.4 eV. The peak height was found to be proportional to Cg, c "~~ where CAI and C M~ are the atomic concentrations of Al and Mg, respectively. The peak as measured after slow furnace cooling, at 0.4 Hz, was displaced to lower temperatures as a result of quenching. The magnitude of this displacement appeared to increase with increasing Mg concentration. -The results, coupled with those of complementary electron microscopy and X-ray lattice parameter studies, substantiate previous interpretation of the peak in

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“…Equation (13) becomes (15) Then, the internal energy change can be represented effectively by the change in the order parameter for the first coordination shell. We in eq.…”

Section: Resultsmentioning

confidence: 99%

Application of Atomic Potential to the Effect of Short Range Order in the α Phase of Cu–Al Alloys

1977

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The dependence of the lattice parameter on quenching temperature was measured for the a Cu-Al alloys of nominal 5, 10, 15 and 18 at %Al compositions. The experimental results were analyzed by means of the pairwise interaction approach. The interactions between atoms were expressed by an exponentially attractive and repulsive potential (EARP) which is analogous to the Morse potential. The adjusting parameters in the potential functions for Al-Al and Cu-Cu pairs were obtained following the method of Girifalco and Weizer. The parameters for Al-Cu pair were estimated by using the experimental data for the lattice parameter.The results obtained are summarized as follows:(1) The lattice parameter increases with quenching temperature and reaches its maximum atThe behavior of the lattice parameter observed in the present work can be considered to be associated with the change of short range order (SRO).(2) The calculated changes in the lattice parameter with the degree of SRO and A] content agree fairly well with the experimental ones.(3) The qualitative agreement was also obtained between the calculated and experimental changes in the bulk modulus with Al content.

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Relaxation effects in solid solutions arising from changes in local order. II. Theory of the relaxation strength

Cited by 90 publications

References 6 publications

Zener Relaxation in Silver Solid Solutions

Zener Relaxation in Silver Solid Solutions

Concentration Dependence of Internal Friction in AlMg Alloy

Application of Atomic Potential to the Effect of Short Range Order in the α Phase of Cu–Al Alloys

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Relaxation effects in solid solutions arising from changes in local order. II. Theory of the relaxation strength

Cited by 90 publications

References 6 publications

Zener Relaxation in Silver Solid Solutions

Zener Relaxation in Silver Solid Solutions

Concentration Dependence of Internal Friction in AlMg Alloy

Application of Atomic Potential to the Effect of Short Range Order in the &alpha; Phase of Cu&ndash;Al Alloys

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Application of Atomic Potential to the Effect of Short Range Order in the α Phase of Cu–Al Alloys