Dislocation Dynamics in Aluminum and in Aluminum-Based Alloys Investigated by TEM and NMR Techniques

Hosson, J.T.M. de; Alsem, W. H. M.; Tamler, H.; Kanert, O.

doi:10.1007/978-94-009-6821-9_3

Cited by 3 publications

(2 citation statements)

References 6 publications

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“…needles of Mg 2 Al 3 in three crystallographic directions in stead of spherical particles. But even in that case the effective separation between needles becomes larger than the effective solute obstacle spacing [38]. Based on the experimental observations in the alloys below and above the solid solubility of magnesium, the strain contrast depicted in Fig.…”

Section: Dislocation Dynamicsmentioning

confidence: 96%

Effects of solute Mg on grain boundary and dislocation dynamics during nanoindentation of Al–Mg thin films

et al. 2004

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Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. AbstractUsing in situ nanoindentation in a transmission electron microscope (TEM) the indentation-induced plasticity in ultrafinegrained Al and Al-Mg thin films has been studied, together with conventional quantitative ex situ nanoindentations. Extensive grain boundary motion has been observed in pure Al, whereas Mg solutes effectively pin high-angle grain boundaries in the Al-Mg alloy films. The proposed mechanism for this pinning is a change in the atomic structure of the boundaries, possibly aided by solute drag on extrinsic grain boundary dislocations. The mobility of low-angle boundaries is not affected by the presence of Mg. Based on the direct observations of incipient plasticity in Al and Al-Mg, it was concluded that solute drag accounts for the absence of discrete strain bursts in indentation of Al-Mg.

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Section: Dislocation Dynamicsmentioning

confidence: 96%

Effects of solute Mg on grain boundary and dislocation dynamics during nanoindentation of Al–Mg thin films

et al. 2004

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“…In this approach, the obstacles are assumed to be spherical and consequently, we ignore the effect that the precipitation in Al may become discontinuous or continuous depending on the temperature. However, even in the case of a Widmanstätten structure, the effective separation between the needle-shaped precipitates is larger than the effective solute obstacle spacing [32]. Therefore, based on the experimental observations in the alloys below and above the solid solubility of Mg, the strain contrast and the abovementioned theoretical considerations, solute atoms are assigned as the main obstacles to dislocation motion.…”

Section: Dislocation and Grain Boundary Motionmentioning

confidence: 99%

Advances in Transmission Electron Microscopy: Self Healing or is Prevention Better than Cure?

Hosson

Yasuda

2007

Springer Series in Materials Science

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In the field of transmission electron microscopy fundamental and practical reasons still remain that hamper a straightforward correlation between microscopic structural information and self healing mechanisms in materials. We argue that one should focus in particular on in situ rather than on postmortem observations of the microstructure. In this contribution this viewpoint has been exemplified with in situ TEM nanoindentation and in situ straining studies at elevated temperatures of metallic systems that are strengthened by either solid solution or antiphase boundaries in intermetallic compounds. It is concluded that recent advances in in situ transmission electron microscopy can provide new insights in the interaction between dislocations and interfaces that are relevant for self healing mechanisms in metallic systems.

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In situ TEM nanoindentation and dislocation-grain boundary interactions: a tribute to David Brandon

et al. 2006

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Dislocation Dynamics in Aluminum and in Aluminum-Based Alloys Investigated by TEM and NMR Techniques

Cited by 3 publications

References 6 publications

Effects of solute Mg on grain boundary and dislocation dynamics during nanoindentation of Al–Mg thin films

Effects of solute Mg on grain boundary and dislocation dynamics during nanoindentation of Al–Mg thin films

Advances in Transmission Electron Microscopy: Self Healing or is Prevention Better than Cure?

In situ TEM nanoindentation and dislocation-grain boundary interactions: a tribute to David Brandon

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