Damping near the Snoek peak in Fe

Stephenson, E. T.; Conard, G. P.

doi:10.1016/0001-6160(68)90006-0

Cited by 9 publications

(2 citation statements)

References 21 publications

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“…According to recent data found in the literature for the activation energies and frequency factors for the diffusion of N and C in ␣-Fe, [32] the N and C Snoek peaks should occur, respectively, at 28 ЊC and 45 ЊC, for the oscillation frequency employed (1.8 Hz). [34] In both cases, the background damping decreases as dislocations become pinned due to aging. [34] In both cases, the background damping decreases as dislocations become pinned due to aging.…”

Section: Resultsmentioning

confidence: 98%

Kinetics of strain aging in drawn pearlitic steels

Buono

Gonzalez

Andrade

1998

Metall Mater Trans A

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The kinetics of strain aging in a drawn pearlitic steel wire were analyzed based on measurements from three different experimental techniques: tensile testing, electrical resistivity, and internal friction. The progress of aging after a total reduction in area of 86 pct by drawing and heating between 60 ЊC and 200 ЊC was evaluated in terms of the changes in yield strength, electrical resistivity, and temperature-dependent background damping. The kinetic law and the apparent activation energies of the processes occurring in this temperature range were determined by the isothermal variation of the transformed fraction, obtained from the changes in properties with aging time. Under the conditions considered, static strain aging of drawn pearlitic steels seems to occur in two distinct stages, each associated with different atomic mechanisms. The first stage takes place between 60 ЊC and 100 ЊC and is characterized by a small increase in yield strength and a decrease in electrical resistivity and background damping. The second stage of aging occurs at higher temperatures or longer aging times and is marked by a sharp increase in yield strength and an increase in electrical resistivity, while the background damping reaches very small values. The probable mechanisms related to this behavior are discussed in terms of the empirical law and the apparent activation energy found.

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Section: Resultsmentioning

confidence: 98%

Kinetics of strain aging in drawn pearlitic steels

Buono

Gonzalez

Andrade

1998

Metall Mater Trans A

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“…There are remarks in many other papers, too, that a dislocation relaxation appears near the Snoek peak temperature. Stephenson and Conard devoted t o this problem a very thorough investigation [22]. The authors measured isothermal and isochronal internal friction and electric resistance time dependences L!!…”

Section: Relwxztion IVmentioning

confidence: 99%

Migrational relaxations in α-FeYC in the region of the Snoek effect

Haneczok

Ilczuk

Kuśka

et al. 1976

Phys. Stat. Sol. (a)

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The isochronal magnetic permeability disaccommodation has been investigated in four α‐FeV (0.3 to 0.9%)–C alloys in the region of the Snoek relaxation. Besides the carbon Snoek process two further relaxations are found, originated from directional ordering of point relaxators. It is shown, that one is due to CV pairs, the other to CC pairs. In samples aged at room temperature a fourth process occurs, whose intensity increases with ageing time. Its pre‐exponential factor amounts to (1 to 5) × 10−11 s and its peak temperature shifts with time. It is suggested that the last relaxation corresponds to thermally activated dislocation movements.

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Recovery of internal friction in cold-worked aluminium containing 0.35 wt% Fe

Graiss

Saad

1985

phys. stat. sol. (a)

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Solution treated as well as aged wires of an Al alloy containing 0.35 wt% Fe are subjected to different amounts of pre‐torsional deformation up to 8% at room temperature, the internal friction Q t−1 of these wires is then measured as a function of the time following deformation. It is found that the time dependence of the decay of Q t−1 can be fairly described by an Avrami‐type equation of the form: (Q t−1 – Q u−1) = (Q 0−1 – Q u−1) exp Ktn with the time power n equals about 1/3. The decay rate K is found to take values strongly dependent on the degree of pre‐deformation in case of the solution treated specimens, while such a dependence is not observed in the aged specimens. The results are essentially explained on the basis of dislocation damping.

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Damping near the Snoek peak in Fe

Cited by 9 publications

References 21 publications

Kinetics of strain aging in drawn pearlitic steels

Kinetics of strain aging in drawn pearlitic steels

Migrational relaxations in α-FeYC in the region of the Snoek effect

Recovery of internal friction in cold-worked aluminium containing 0.35 wt% Fe

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