The trapping of positrons by dislocations produced in single crystal bending

Johnson, M. L.; Saterlie, S.; Byrne, J. G.

doi:10.1007/bf02649794

Cited by 19 publications

(3 citation statements)

References 11 publications

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“…Kao et al [18] found a linear correlation between the positron parameter and a dislocation density obtained from X-ray measurements for the steel. Smedskjaer et al [19] referring to the paper of Johnson et al [20] estimated a dislocation density of 10 8 -10 9 cm À 2 being necessary to cause observable positron trapping. (The review of the positron studies related to the dislocations may be found in the paper by Byrne [21].)…”

Section: Microhardness Profilementioning

confidence: 99%

Use of positron annihilation measurements to detect the defect beneath worn surface of stainless steel 1.4301 (EN) under dry sliding condition

Dryzek

Horodek

Wróbel

2012

Wear

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Section: Microhardness Profilementioning

confidence: 99%

Use of positron annihilation measurements to detect the defect beneath worn surface of stainless steel 1.4301 (EN) under dry sliding condition

Dryzek

Horodek

Wróbel

2012

Wear

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“…23,26,27 Therefore, Doyama and Cotterill 25 suggested considering dislocation lines at room temperature rather as precursor states for a transition into deeper traps such as vacancies trapped in the elastic stress field around a dislocation or ͑monoatomic͒ jogs on edge dislocation lines, for which a positron lifetime slightly lower to those in vacancies have been calculated, 19 than the final annihilation site. 15,28,29 The consequences of this model, especially on the temperature dependence of the positron trapping rate at dislocations, were discussed by several authors.…”

Section: B Positron Annihilation In Plastically Deformed Metalsmentioning

confidence: 99%

Nondestructive monitoring of fatigue damage evolution in austenitic stainless steel by positron-lifetime measurements

Holzwarth

Schaaff

2004

Phys. Rev. B

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Positron-lifetime measurements have been performed on austenitic stainless steel during ͑i͒ stress-and ͑ii͒ strain-controlled fatigue experiments for different applied stress and strain amplitudes, respectively. For this purpose a generator-detector assembly with a 72 Se/ 72 As positron generator ͓maximum activity 25 Ci ͑0.9 MBq͔͒ has been mounted on mechanical testing machines in order to measure the positron lifetime without removing the specimens from the load train. The average positron lifetime has been determined by a ␤ ϩ Ϫ␥ coincidence. The feasibility to use the average positron lifetime for monitoring the evolution of fatigue damage and to predict early failure has been examined. In strain-and stress-controlled experiments the average positron lifetime shows a pronounced increase within the first 10% and 40% of the fatigue life, respectively. In stress-controlled experiments the average positron lifetime at failure depends significantly on the applied stress amplitude. In strain-controlled experiments significantly different positron lifetimes for different applied plastic strain amplitudes are obtained within the first 1.000 fatigue cycles, whereas differences get wiped out during further cycling until failure.

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“…(10] reported the results of their PAS investigation of dislocation structures in high purity copper.…”

mentioning

confidence: 98%

On the use of Positron Annihilation Spectroscopy in the Study of a Nonuniform Spatial Distribution of Metallurgical Defects

Schaffer

1986

MRS Proc.

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Most of the Interpretation of positron annihilation results to date have been done within the context of the simple trapping model which assumes a uniform spatial distribution of defects within the specimen examined.While this assumption is often justifiable there are numerous metallurgical defect configurations which are markedly nonuniform.In this work some of the appropriate trapping models which have previously appeared in the literature will be briefly reviewed.Additional models which are currently being developed will be presented and the series of experiments which are being used to test the trapping models will be described.

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The trapping of positrons by dislocations produced in single crystal bending

Cited by 19 publications

References 11 publications

Use of positron annihilation measurements to detect the defect beneath worn surface of stainless steel 1.4301 (EN) under dry sliding condition

Use of positron annihilation measurements to detect the defect beneath worn surface of stainless steel 1.4301 (EN) under dry sliding condition

Nondestructive monitoring of fatigue damage evolution in austenitic stainless steel by positron-lifetime measurements

On the use of Positron Annihilation Spectroscopy in the Study of a Nonuniform Spatial Distribution of Metallurgical Defects

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