Internal Friction in Metals

Postnikov, V. S.

doi:10.1007/978-1-4899-4725-3_1

Cited by 62 publications

(41 citation statements)

References 29 publications

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“…On the contrary, Postnikov [24] presented results on annealed and plastically deformed pure aluminum, showing that after deformation the resultant peak was about four times higher, being the peak temperature unaltered and very close to that reported by K~ [1]. Later on, Berrisford et al [25] analysed the influence of plastic deformation on the low-temperature GB peak in copper.…”

Section: -History and Characteristics Of The Grain Boundary Relaxationmentioning

confidence: 79%

Present state of the controversy about the grain boundary relaxation

Povolo

Molinas

1992

Il Nuovo Cimento D

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Summary. --An analysis of the internal friction produced by grain boundary relaxation in metals and alloys and ceramics is presented. The different interpretations given in the literature to relaxation phenomena occurring at temperatures above about half the melting point which include the influence of grain boundaries and their interaction with solutes and precipitates are discussed in detail. A complete set of the experimental data disposable in this field since 1972 up today is rewiewed. Finally, some recent experiments are discussed and new ones are suggested. They might solve the actual controversy about the real origin of the relaxation phenomena observed.PACS 62.40 -Anelasticity, internal friction, and mechanical resonances.

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Section: -History and Characteristics Of The Grain Boundary Relaxationmentioning

confidence: 79%

Present state of the controversy about the grain boundary relaxation

Povolo

Molinas

1992

Il Nuovo Cimento D

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“…It is shown in [3,[16][17][18] that due to this fact the unelastic grain-boundary deformation depending on grain-boundary diffusion (in particular, true grain boundary sliding) is made easier. It is well-known from [19][20][21][22][23] that the unelastic grain-boundary deformation leads to grain-boundary internal friction under external thermal-force action. In general, coarse-grained recrystallized metals show two relaxation maxima of the grain-boundary internal friction [23].…”

Section: Unelastic Grain-boundary Deformationmentioning

confidence: 99%

Structure, unelastic properties, and deformation behavior of ultrafine-grained titanium

2004

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The results of investigations into the structure, unelastic properties, deformation behavior, strength, and plasticity of ultrafine-grained titanium produced by equichannel angular pressing are discussed. Particlular emphasis has been placed on the grain-boundary unelasticity and the effects of external thermal and thermal-force actions on the deformation behavior and plastic deformation localization at the meso-and macroscale levels. The influence of cold plastic deformation of ultrafine-grained titanium on the grain-boundary unelasticity and temperature dependence of the mechanical properties is considered.

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“…A very sensitive and selective characteristic of inelastic deformation in solids (including that at the grain boundaries) at low stresses is internal friction [14][15][16][17]. According to the numerous experimental studies, the temperature dependence for the internal friction Q -1 (T) of recrystallized polycrystalline metals in the general case have two relaxational peaks of internal friction due to the development of inelastic deformation under externally applied stress.…”

Section: Introductionmentioning

confidence: 99%

The influence of interstitial impurities on true grain-boundary sliding of titanium in coarse-grained and submicrocrystalline states

et al. 2011

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The structure and temperature dependence of low-frequency internal friction of Grade-2 and Grade-4 titanium specimens following equal-channel angular pressing is investigated. It is established that specimens of both grades in submicrocrystalline states possess a high fraction of high-angle boundaries (η ~ 70%) for the average grain size d ~ 0.8 μm. Formation of this structure results in a much lower temperature of initiation and development of true grain-boundary sliding compared to the coarse-grained titanium. It is noted that the grainboundary sliding activation energy in submicrocrystalline titanium increases with the impurity concentration from 74 ± 4 (Grade-2) to 88 ± 4 (Grade-4) kJ/mol, but is found to be much lower for the coarse-grained recrystallized titanium (140 ± 4 kJ/mol).

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Internal Friction in Metals

Cited by 62 publications

References 29 publications

Present state of the controversy about the grain boundary relaxation

Present state of the controversy about the grain boundary relaxation

Structure, unelastic properties, and deformation behavior of ultrafine-grained titanium

The influence of interstitial impurities on true grain-boundary sliding of titanium in coarse-grained and submicrocrystalline states

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