Low-temperature stress-relaxation peaks in plastically deformed polycrystalline niobium

Chambers, R.H.; Schultz, J. M.

doi:10.1016/0001-6160(60)90113-9

Cited by 30 publications

(4 citation statements)

References 9 publications

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“…Damping peaks in cold worked niobium in the temperature region around and below room temperature have been described by BRUNER [l], CHAMBERS and SCHULTZ [2,3,4], BORDONI et al [5] and the present author [6, 71. Two absorption maxima are found; e. g. a t 15000 Hz around 165 O K and 310 OK.…”

Section: Introductionsupporting

confidence: 52%

On the Deformation Induced Internal Friction Peaks in Niobium

Batist¹

1963

Physica Status Solidi (b)

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The activation energies and attempt frequencies for the deformation induced damping peaks in niobium are determined. For the α peak these are found to be 0.28 ± 0.01 eV and (2.8 ± 1.8) 1012s−1 from the variation of peak temperature with frequency and using all experimental data presently available. For the β peak, these parameters are estimated using strain recovery experiments performed during the warm‐up after plastic deformation at liquid nitrogen temperature. A value of 0.51 eV is found for 1012 s−1 and 0.48 eV for 1011 s−1, to be compared with values of 0.47 eV and about 1011 s−1 obtained by CHAMBERS and SCHULTZ from the shift of peak temperature with frequency. The width of the α peak is shown to be consistent with a relaxation process having a single attempt frequency, and a distribution of activation energies. Assuming a square distribution of width ΔH about H, it is found that ΔH|H ≈︁ 0.10.

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Section: Introductionsupporting

confidence: 52%

On the Deformation Induced Internal Friction Peaks in Niobium

Batist¹

1963

Physica Status Solidi (b)

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“…A few years after the mechanism of the Bordoni-type relaxation processes in fcc metals had become the subject of discussion, a search for analogous processes in bcc metals began [52][53][54][55][56][57][58]. By that time, striking differences between the deformation behaviour of fcc and bcc metals were already well established.…”

Section: Dislocations In Deformed Body-centred Cubic Metals 11mentioning

confidence: 99%

Progress and problems in the understanding of the dislocation relaxation processes in metals

Seeger

2004

Materials Science and Engineering: A

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“…5 is the result of subsequent strain-aging of the specimen at 190°C for 15 min. Chambers and Schultz (8) showed that such a strain-aging treatment leads to strong dislocation pinning by interstitial impurities such as oxygen. As dislocations are pinned, their contribution to the nonelastic component of the modulus is removed, resulting in a lowering of the a internal-friction peak and an increase in th~ resonant frequency of the sample on the high-temperature side of the relaxation peak .. As is seen in Fig.…”

Section: Dislocation Relaxation Spectra In Cold-worked Niobium Singlementioning

confidence: 99%

“…Thus, Eq. (8) becomes dx a B dt + Cx = a-cos wt (9) The internal friction,Q -l, can be calculated by standard methods from Eq. (9) to give…”

Section: ~:Cmentioning

confidence: 99%

A PROGRAM OF BASIC RESEARCH ON MECHANICAL PROPERTIES OF REACTOR MATERIALS. Quarterly Progress Report for Period Ending March 31, 1962

Trozera¹,

Chambers²,

White³

1962

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Low-temperature stress-relaxation peaks in plastically deformed polycrystalline niobium

Cited by 30 publications

References 9 publications

On the Deformation Induced Internal Friction Peaks in Niobium

On the Deformation Induced Internal Friction Peaks in Niobium

Progress and problems in the understanding of the dislocation relaxation processes in metals

A PROGRAM OF BASIC RESEARCH ON MECHANICAL PROPERTIES OF REACTOR MATERIALS. Quarterly Progress Report for Period Ending March 31, 1962

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