Low Temperature Release of Stored Energy in Cold Worked Copper

Henderson, J. W.; Koehler, J. S.

doi:10.1103/physrev.104.626

Cited by 30 publications

(2 citation statements)

References 13 publications

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“…In Brinkman's picture of the displacement spike the atoms are driven outward from the path of the 13 primary knock on ending up in an outside shell and leaving a void in the path of the primary. In Brinkman's picture of the displacement spike the atoms are driven outward from the path of the 13 primary knock on ending up in an outside shell and leaving a void in the path of the primary.…”

Section: Discussionmentioning

confidence: 99%

Fission-Fragment Damage in Gold Films

Merkle

Singer

Hart

1963

Journal of Applied Physics

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The effects of fission-fragment irradiation on evaporated single-crystalline gold films have been studied by transmission electron microscopy. The outstanding feature observed after irradiation is the appearance of black spots of 20 to 300 A in diameter. These images are diffraction effects caused by damage regions and their surrounding strain field. It is believed that the damage regions are produced by energetic primaries. In some instances the defects could be identified as triangular dislocation loops on (111) planes. Dark-field observations indicate that defects with a compressive as well as defects with a tensile strain field are present. From determinations of the density of spots it is concluded that the average fission fragment produces 25 spots along its path in gold.

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Section: Discussionmentioning

confidence: 99%

Fission-Fragment Damage in Gold Films

Merkle

Singer

Hart

1963

Journal of Applied Physics

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“…This suggests that an alternative mechanism may operate in which dislocations running back during unloading sweep up deformation-produced point defects and become pinned by them. Such a mechanism would explain the large increase of Au with decrease in temperature; as the temperature of deformation is decreased a much larger fraction of the point defects generated during deformation is retained in the metal (Henderson and Koehler 1956 Beukell963). It also provides an explanation for the dependence of A u on the amount of unloading, since the effectiveness of the initial pinning will depend upon the number of pinning points and these will increase as the area traversed by the dislocations in running back increases, viz.…”

Section: Downloaded By [University Of California San Diego] At 12:mentioning

confidence: 99%

Yield phenomena in polycrystalline copper

Titchener

Davies

1965

The Philosophical Magazine: A Journal of Theoretical Experiment

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Unloading and ageing experiments are reported for polycrystalline copper deformed in tension at 2 9 4 "~, 1 9 6 "~ and 79°K. The magnitude of the yield effect was investigated as a function of stress, purity, grain size, amount of unloading and the time under reduced load. It was concluded that both the initial unloading yield and the subsequent ageing yield could be attributed to the pinning of dislocations by point defects generated during deformation.

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Verformung und elektrischer Widerstand von Kupfer‐Einkristallen bei tiefsten Temperaturen

Buck

1962

Physica Status Solidi (b)

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Bei der Temperatur des flüssigen Heliums wurden Kupfereinkristalle im Zugversuch verformt und dabei gleichzeitig der elektrische Widerstand gemessen. Es wurde festgestellt, daß sich ebenso wie die Verfestigungskurve auch die Zunahme des elektrischen Widerstandes während der Verformung in zwei verschiedene Bereiche einteilen läßt. Im Bereich des „easy glide”︁ (Bereich I) nimmt der Widerstand linear mit der Schubspannung zu. während im Bereich II ein parabolischer Zusammenhang besteht. In der Erholung des elektrischen Widerstandes nach Verformung tritt keine Stufe I auf; die Form der Stufe II ließ sich bis jetzt durch Variation des Reinheitsgrades der Proben nicht beeinflussen. In einer Erholungsstufe des elektrischen Widerstandes zwischen 600 und 700 °K heilen mechanisch gebildete Zwillinge aus. Es wird angenommen, daß diese Stufe auf den spezifischen elektrischen Widerstand von Zwillingsgrenzen zurückzuführen ist. Die Widerstandsänderung während der diskontinuierlichen Gleitung ist reversibel, aber infolge der Größe des Effektes schwer zu verstehen.

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Low Temperature Release of Stored Energy in Cold Worked Copper

Cited by 30 publications

References 13 publications

Fission-Fragment Damage in Gold Films

Fission-Fragment Damage in Gold Films

Yield phenomena in polycrystalline copper

Verformung und elektrischer Widerstand von Kupfer‐Einkristallen bei tiefsten Temperaturen

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