“Observation” of dislocation motion in single crystal and polycrystalline aluminum during uniaxial deformation using photoemission technique

Cai, Mei; Levine, Lyle E.; Langford, S. C.; Dickinson, J. T.

doi:10.1016/j.msea.2005.01.076

Cited by 17 publications

(4 citation statements)

References 11 publications

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“…If the average number of active bands is small, the stochastic nature of the nucleation stresses for band nucleation would lead to situations where the last band saturates before the next band nucleates, producing a brief cessation in dislocation activity. This behavior is in good agreement with recent experimental work using photoelectron emission to study the time dependence of slip [9].…”

Section: Description Of the Modelsupporting

confidence: 91%

The statistical origin of bulk mechanical properties and slip behavior in fcc metals

Levine

Thomson

2005

Materials Science and Engineering: A

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Section: Description Of the Modelsupporting

confidence: 91%

The statistical origin of bulk mechanical properties and slip behavior in fcc metals

Levine

Thomson

2005

Materials Science and Engineering: A

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“…35,36 Real-time measurements of the photoelectronenergy distributions then provide a time-resolved probe of dislocation motion and evolution of surface orientation with deformation. 40 Figure 6 shows that the electron intensities corresponding to high work function planes (electron kinetic energies below 0.7 eV) decrease during deformation, while the intensities corresponding to low work function planes increase (electron kinetic energies above 0.7 eV). Before deformation, the intensity of electrons with energies between 0.3 and 0.6 eV amounts to 59% of the total charge in the region of interest.…”

Section: Discussionmentioning

confidence: 99%

Deformation of cube-textured aluminum studied using laser-induced photoelectron emission

et al. 2007

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The evolution of the kinetic energy distribution of photoelectrons from a cube-oriented aluminum sample during tensile deformation was probed with a retarding field energy analyzer. Because of the anisotropy of the aluminum work function, the electron-energy distribution is altered as the area fractions of the major surface planes change during deformation. In cube-textured aluminum, deformation reduces the {100} area fraction and the relatively low energy electrons from these surfaces. Conversely, the {110} and {111} area fractions and the relatively high energy electrons from these surfaces both increase. These changes are quantitatively consistent with texture analysis by electron backscattered diffraction (EBSD). They reflect deformation-induced production of {111} surfaces by slip and the exposure of {110} surfaces by grain rotation. Photoelectron kinetic energy measurements supplement EBSD measurements and are readily acquired in real-time.

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“…Using anodized aluminum, Arnott and Ramsey 1 detected significant increases in electron emission during the deformation of samples with average oxide thicknesses below 45 nm. We have previously reported changes in laser-induced electron emission intensities accompanying plastic deformation of several Al alloys 32 and single crystals 42 with native oxide coatings. Figure 7͑a͒ displays a typical smoothed stress and photoelectron signals as a function of applied strain acquired during testing of an aluminum tensile specimen oxidized for 3 h at 400°C.…”

Section: Photoelectron Emission During Deformationmentioning

confidence: 99%

The effect of thermal oxidation on laser-induced photoelectron emission during tensile deformation of polycrystalline aluminum

Cai

Ricker

Levine

et al. 2010

Journal of Applied Physics

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Many metals emit electrons when exposed to UV radiation ͑photon energies 4 to 8 eV͒. Deformation can significantly affect the intensity of these emissions. In the case of reactive metals, these emissions are also altered by the presence of surface oxides. We have characterized the effect of thermal oxides on laser-induced photoelectron emission from commercially pure polycrystalline aluminum with a view toward using these emissions as a probe of deformation processes. The thickness of oxides produced by a range of annealing treatments in air was determined by x-ray photoelectron spectroscopy. Time-of-flight measurements on photoelectrons from these surfaces under 248 nm irradiation ͑5 eV photons͒ show two peaks: a fast peak which we attributed to electrons from metallic aluminum, and a slower peak, which may be due to electrons from interface states. Surface oxide films of sufficient thickness attenuate both peaks. We show that the sensitivity of the photoelectron signals to deformation varies with thermal oxidation pretreatments and oxide film thickness and that with the appropriate oxide thickness the total photoelectron intensity becomes a sensitive probe of deformation-related processes during tensile testing.

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“Observation” of dislocation motion in single crystal and polycrystalline aluminum during uniaxial deformation using photoemission technique

Cited by 17 publications

References 11 publications

The statistical origin of bulk mechanical properties and slip behavior in fcc metals

The statistical origin of bulk mechanical properties and slip behavior in fcc metals

Deformation of cube-textured aluminum studied using laser-induced photoelectron emission

The effect of thermal oxidation on laser-induced photoelectron emission during tensile deformation of polycrystalline aluminum

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