Vorg�nge bei der Dehnung von Zinkkristallen

A new experimental technique to study crystallographic slip system activity in metallic single crystals deformed under a condition of uniaxial stress is applied to study the behavior of Zn single crystals. The experimental apparatus allows essentially unconstrained shape change of inherently anisotropic materials under a condition of uniaxial stress by allowing 3 translational and 3 rotational degrees of freedom during compression; hence we have named the experiment 6 degrees of freedom (6DOF). The experiments also utilize a 3-D digital image correlation system to measure full-field displacement fields, which are used to calculate strain and make direct observations of slip system activity. We show that the experimental results associated with a pristine zinc single crystal are precisely consistent with the theoretical predicted shape change (sample distortion) assuming that the most favored slip system on the basal plane is the only one that is active. Another experiment was performed on a processed and annealed Zn single crystal to investigate slip that is inconsistent with the critical resolved shear stress (CRSS) theory. These experiments on zinc illustrate the ability of the 6DOF experiment, together with image correlation (IC) data, to measure slip system activity with a high degree of fidelity.

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“…[10][11][12] This behavior makes Zn a logical choice as a test material to benchmark the performance of the 6DOF experiment.…”

Section: Resultsmentioning

confidence: 99%

Zinc Single-Crystal Deformation Experiments Using a “6 Degrees of Freedom” Apparatus

Lassila

LeBlanc

Florando

2007

Metall Mater Trans A

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“…Figure 2b presents the orientation changes along the sample length axis after deformation, indicating that, for instance, the straining axis of sample P1, strained to only 4%, did not rotate due to the storage of dislocations on the primary slip system. In contrast, sample P2 and also P3 to some degree behave as postulated by Schmid in [19] for constrained macroscopic single crystals. The sample centers rotate towards the h100iÀh111i line of the unit triangle by single slip, where multiple slip is expected to set in.…”

mentioning

confidence: 84%

Dislocation storage in single slip-oriented Cu micro-tensile samples: new insights via X-ray microdiffraction

Kirchlechner

Kiener

Motz

et al. 2011

Philosophical Magazine

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Synchrotron X-ray microdiffraction was used to characterize the deformation structure of single crystalline Cu micro-tensile specimens which were oriented for single slip. The 3-mm thick samples were strained in situ in a scanning electron microscope (SEM). Electron microscopy observations revealed glide steps at the surface indicating single slip. While the slip steps at the surface must have formed by the predominant activation of the primary glide system, analysis of Laue peak streaking directions revealed that, even at low strains, dislocations had been activated and stored on an unpredicted slip system. Furthermore, the mLaue scans showed that multiple slip takes over at a later state of deformation.

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“…which inspired the development of shaped growth methods from the melt in the 1920s. [120], Lindner [113,114], Hoyem and Tyndall [83,84]). Von Gomberz [77] improved the meniscus stability by insertation of a mica disk, floating on the melt surface and pierced with a circular hole through which the crystalline fiber was drawn.…”

Section: Metalsmentioning

confidence: 99%

“…In the 1920s von Gomperz [77], Mark et al [120], Linder [113], and Hoyem [83] grew the first metallic crystals through a hole in a floating miea disk, primarily, to prevent oxidation of the melt surface. Much later, 1959Much later, -1960, well-aimed studies on the role of surface tension in the pulling of shaped single crystals were started by guiding the melt through a capillary (die) by Stepanov [158] and Gaule and Pastore [74].…”

Section: Upward Pulling Trom a Meniscus Shapermentioning

confidence: 99%

Fiber Crystal Growth from the Melt

Vogler¹

2004

Advances in Materials Research

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Vorg�nge bei der Dehnung von Zinkkristallen

Cited by 92 publications

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Zinc Single-Crystal Deformation Experiments Using a “6 Degrees of Freedom” Apparatus

Zinc Single-Crystal Deformation Experiments Using a “6 Degrees of Freedom” Apparatus

Dislocation storage in single slip-oriented Cu micro-tensile samples: new insights via X-ray microdiffraction

Fiber Crystal Growth from the Melt

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