Stress relaxation and creep in α-iron filamentary single crystals at low temperature

Groh, P.; Conte, R.

doi:10.1016/0001-6160(71)90082-4

Cited by 47 publications

(14 citation statements)

References 17 publications

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“…Besides the formalism, the existence of some dislocation recovery during relaxation could lead to different results. Equation [4] fits the long duration SR curves as well as the short ones, and no deviations at long times are noticed, leading to similar V app values. This indicates that no structural changes occur during stress relaxation, at least in the times involved here.…”

Section: Discussionmentioning

confidence: 67%

“…Some discrepancies between both experimental techniques have been remarked by Diak et al [6], discussing the formalism of Hart-Li. In the present analysis, expressions derived from thermally activated glide [4] are used and SR test results are equivalent to those of SRCH tests. Besides the formalism, the existence of some dislocation recovery during relaxation could lead to different results.…”

Section: Discussionmentioning

confidence: 99%

“…On the other hand, during a stress relaxation, the stress decreases with the time t following a logarithmic relation [4], where l ¼ kT V app and c ¼ l=M _ e e 0 with M the combined elastic modulus of the specimen and machine.…”

Section: Activation Volume Measurementmentioning

confidence: 99%

“…Consequently, each deformation process can be characterised by the activation volume value and its stress dependence [1,2]. Moreover, the dramatic activation volume changes measured in the micro-macro yielding transition make this parameter an appropriate tool for microstrain studies [3,4].…”

Section: Introductionmentioning

confidence: 99%

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Activation Volume Measurement Techniques: Application to Zircaloy-4

Cuniberti

Picasso

2001

phys. stat. sol. (a)

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Subject classification: 62.20.-x; S1 Stress relaxation and strain rate change tests were performed in Zircaloy-4 at room temperature. The apparent and effective activation volumes were determined and the results obtained by the different techniques are compared. The stress dependence of activation volumes is studied in a broad range of stresses, and an analysis is made in the light of the thermal activation theory. The results suggest that plasticity is ruled by the overcoming of Peierls barriers.

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Section: Discussionmentioning

confidence: 67%

Section: Discussionmentioning

confidence: 99%

Section: Activation Volume Measurementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Activation Volume Measurement Techniques: Application to Zircaloy-4

Cuniberti

Picasso

2001

phys. stat. sol. (a)

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“…At low temperatures and at stresses higher than the macroyield stress, the screw dislocation mobility is Previous experiments in that temperature range mainly in iron but also in niobium lead to the following results [1], [9,10,11,12] : i) Stress relaxation is a logarithmic function of time, in agreement with the laws of thermal activation [9].…”

Section: The Preyield Behaviour Of Bcc Metals -mentioning

confidence: 60%

Exhaustion mechanisms in the Preyield domain of niobium single crystals at low temperatures

Böudet

Kubin

1975

J. Phys. France

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The thermally activated deformation of tellurium single crystals

Crampon¹,

Doukhan²,

Escaig³

et al. 1974

Phys. Stat. Sol. (a)

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Low temperature prismatic glides of tellurium are strongly thermally activated. A meaningful macroelastic‐limit criterion has been found to be most convenient in this situation where extensive parabolic stage occurs to the passage from microplasticity to macroplasticity. This definition is discussed from the point of view of the dislocation substructure and of the experimental results. For a‐glide, the stability of a‐edge dislocations accounts for the strong temperature variation of elastic‐limit, small activation volumes, and a maximum activation energy U0 = (0.50 ± 0.05) eV which can be attributed to the double‐kink nucleation energy. For c‐glide, the stability of c‐screw dislocations leads to a strong lattice friction up to 150°K. Above 150°K, the lattice friction is annihilated; due to an extensive glide polygonisation, c‐edge dislocations form tilt walls, and c‐ and a‐screw dislocations form twist walls.

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Stress relaxation and creep in α-iron filamentary single crystals at low temperature

Cited by 47 publications

References 17 publications

Activation Volume Measurement Techniques: Application to Zircaloy-4

Activation Volume Measurement Techniques: Application to Zircaloy-4

Exhaustion mechanisms in the Preyield domain of niobium single crystals at low temperatures

The thermally activated deformation of tellurium single crystals

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