Cell Structures in Deformed Copper Single Crystals

Kawasaki, Yozo

doi:10.1143/jpsj.36.142

Cited by 35 publications

(9 citation statements)

References 13 publications

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“…[7,14,19,[93][94][95] The discovery, however, that extended boundaries are a common feature of most deformaIn Section B, the dislocation structures have been analyzed as being essentially free of long-range stresses, an assumption microstructures opened up the possibility of quantifying the effect of the slip pattern on the deformation microstruction based on low-angle X-ray scattering experiments [85,86] and transmission electron microscopy (TEM) observature with the objective of being able to relate load conditions with resulting microstructures. Examples of such analysis tions.…”

Section: Slip Patternmentioning

confidence: 99%

New discoveries in deformed metals

Hansen¹,

Mehl²,

Medalist³

2001

Metall Mater Trans A

486

165

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Microstructural analysis by advanced and automated methods has allowed deformation microstructures to be quantified in terms of common structural parameters. This quantification has shown for a variety of materials and processing conditions that the microstructural evolution follows a universal pattern of grain subdivision from the macroscale to the nanometer scale. This microstructural evolution has been described empirically and in theoretical models based on general principles for the formation of dislocation structures during plastic deformation by slip. The similarity between the behavior of materials undergoing different deformation patterns forms the basis for future research and development encompassing traditional as well as new materials and processes.

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Section: Slip Patternmentioning

confidence: 99%

New discoveries in deformed metals

Hansen¹,

Mehl²,

Medalist³

2001

Metall Mater Trans A

486

165

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“…Kawasaki (24) has reported that the flow stress of the [112] and the [415] crystals were proportional to the density of the cell walls which develop approximately parallel to the active slip plane. This observation is consistent with the model of work hardening proposed by the present author (25).…”

Section: The [112] Type Crystalsmentioning

confidence: 99%

Work Hardening of Copper Single Crystals with Multiple Glide Orientations

Takeuchi

1975

Trans. JIM

108

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Copper single crystals with deformation axes in [001], [112], [111], [212], [101], [102], and [213] supplemented. The stress-strain behaviour and its variation with temperature were observed systematically. The crystal orientations after tensile deformations were determined by the slip lines on the specimen surfaces which were chemically polished after prestrain and extended by a few percent. The results showed that the tensile axes of the [101]

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“…It should be noted that the choice of copper as a material for current investigation was made to check the sensitivity of the proposed relaxation method, because copper possesses extremely low yield stress. Indeed, the experimentally measured yield stress in high purity well annealed single crystal copper at the ambient conditions is in the range from 1.0 MPa to 4.4 MPa [11][12][13][14][15]. Thus, the obtained here value is only slightly higher than the experimental ones.…”

Section: Epj Web Of Conferencesmentioning

confidence: 57%

Atomistic modeling of the dislocation dynamics and evaluation of static yield stress

Karavaev

Dremov

Ionov

2015

EPJ Web of Conferences

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Abstract. Static strength characteristics of structural materials are of great importance for the analysis of the materials behaviour under mechanical loadings. Mechanical characteristics of structural materials such as elastic limit, strength limit, ultimate tensile strength, plasticity are, unlike elastic moduli, very sensitive to the presence of impurities and defects of crystal structure. Direct atomistic modeling of the static mechanical strength characteristics of real materials is an extremely difficult task since the typical time scales available for the direct modeling in the frames of classical molecular dynamics do not exceed a hundred of nanoseconds. This means that the direct atomistic modeling of the material deformation can be done for the regimes with rather high strain rates at which the yield stress and other mechanical strength characteristics are controlled by microscopic mechanisms different from those at low (quasi-static) strain rates. In essence, the plastic properties of structural materials are determined by the dynamics of the extended defects of crystal structure (edge and screw dislocations) and by interactions between them and with the other defects in the crystal. In the present work we propose a method that is capable to model the dynamics of edge dislocations in the fcc and hcp materials at dynamic deformations and to estimate the material static yield stress in the states of interest in the frames of the atomistic approach. The method is based on the numerical characterization of the stress relaxation processes in specially generated samples containing solitary edge dislocations.

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Cell Structures in Deformed Copper Single Crystals

Cited by 35 publications

References 13 publications

New discoveries in deformed metals

New discoveries in deformed metals

Work Hardening of Copper Single Crystals with Multiple Glide Orientations

Atomistic modeling of the dislocation dynamics and evaluation of static yield stress

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