Dynamical <i>in situ</i> nuclear-magnetic-resonance tensile apparatus

Hackelöer, H. J.; Kanert, O.; Tamler, H.; Hosson, J.Th.M. De

doi:10.1063/1.1137370

Cited by 18 publications

(5 citation statements)

References 5 publications

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“…Rowland and Fradin [5], Kanert [1] and others were thus able to evaluate the impurity diffusion in alloys. These techniques, in addition, made it possible to probe the jumping dislocations in situ during deformation in a non-interactive fashion [6][7][8]. We have recently reported an investigation of the superimposed effects of deformation on spin-lattice relaxation time (of Z3Na) in the rotating frame, T10, in singlecrystalline pure (~ 1.5p.p.m.…”

Section: -2461 9 1996 Chapman and Hallmentioning

confidence: 99%

In situ nuclear magnetic resonance study of defect dynamics during deformation of materials

Murty

Detemple

Kanert

et al. 1996

JOURNAL OF MATERIALS SCIENCE

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Nuclear magnetic resonance techniques can be used to monitor in situ the dynamical behaviour of point and line defects in materials during deformation. These techniques are non-destructive and non-invasive. We report here the atomic transport, in particular the enhanced diffusion during deformation by evaluating the spin lattice relaxation time in the rotating frame, Tip, in pure NaCI single crystals as a function of temperature (from ambient to about 900 K) and strain-rate (to ~ 1.0 s-1) in situ during deformation. The strain-induced excess vacancy concentration increased with the strain-rate while in situ annealing of these excess defects is noted at high temperatures. Contributions due to phonons or paramagnetic impurities dominated at lower temperatures in the undeformed material. During deformation, however, the dislocation contribution became predominant at these low temperatures. The dislocation jump distances were noted to decrease with increase in temperature leading to a reduced contribution to the overall spin relaxation as temperature is increased. Similar tests with an improved pulse sequence (CUT-sequence), performed on ultra-pure NaCI and NaF single crystals revealed slightly different results; however, strain-enhanced vacancy concentrations were observed. The applicability of these techniques to metallic systems will be outlined taking thin aluminium foils as an example.

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Section: -2461 9 1996 Chapman and Hallmentioning

confidence: 99%

In situ nuclear magnetic resonance study of defect dynamics during deformation of materials

Murty

Detemple

Kanert

et al. 1996

JOURNAL OF MATERIALS SCIENCE

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“…The sequence is triggered by the electronic control of the servo-hydraulic deformation device. Details of the setup are described elsewhere [5].…”

Section: Introductionmentioning

confidence: 99%

In-situ NMR study of dislocation motion in Ca++-doped NaCl crystals

Michael

Kanert

Küchler

et al. 2004

Solid State Communications

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Using a fast multi-window NMR technique, we have measured in-situ the mean jump width x of mobile dislocations during plastic deformation in a series of NaCl single crystals with varying Ca þ þ content. Aside from immobile forest dislocations, the Ca þ þ impurities form additional obstacles for the moving dislocations thus lowering x: We found that the Ca þ þ-related obstacles exhibit a pronounced non-random distribution which results in a corresponding broad distribution of x: We show that the data can be evaluated by means of an appropriate distribution function gð1=xÞ with an uncommon dependence of the observed fitting parameters on the Ca þ þ content. As expected, quenching of a sample leads to a more uniform distribution of the Ca þ þ-related obstacles resulting in a corresponding narrowing of gð1=xÞ:

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“…During the deformation experiments, the acting load and the resulting plastic deformation are measured separately and simultaneously. Information of the experimental set-up can be found in (5).…”

Section: Methodsmentioning

confidence: 99%