Dislocation density of pure copper processed by accumulative roll bonding and equal-channel angular pressing

Miyajima, Yoji; Okubo, Satoshi; Abe, Hiroki; Okumura, Hiroki; Fujii, Toshiyuki; Onaka, Susumu; Kato, Masaharu

doi:10.1016/j.matchar.2015.04.009

Cited by 44 publications

(11 citation statements)

References 13 publications

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“…In particular, there is a correlation between the strain state and microstructure. For example, Miyajima et al 16 observed that the dislocation density depends on grain shape and size in the case of samples deformed by ECAP. Ungar et al…”

Section: Resultsmentioning

confidence: 99%

Dislocation Density and Texture in Copper Deformed by Cold Rolling and Ecap

2017

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Section: Resultsmentioning

confidence: 99%

Dislocation Density and Texture in Copper Deformed by Cold Rolling and Ecap

2017

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“…6); hence, we also investigate the effect of intragranular lattice dislocations on v m by introducing three edge dislocation dipoles in a grain where grain boundary migration occurs. The dislocation density is approximately 3 × 10 15 1/m 2 , which is about ten times larger than the experimentally observed dislocation density of pure copper after SPD 22) . The analysis temperature is kept at 300 K using the velocity scaling method.…”

Section: Mobility Of Partial Disclinationsmentioning

confidence: 56%

Grain Subdivision Mechanism Related to Partial Disclinations in Severe Plastic Deformation: A Molecular Dynamics Study

Shimokawa

Yamashita²,

Niiyama

et al. 2016

Mater. Trans.

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Severe plastic deformation (SPD) processes can produce the bulk ultra ne-grained metals with grain sizes of less than 1 μm. However, the mechanism of grain re nement during SPD is not completely understood. In this study, we perform molecular dynamics simulations of a SPD process like equal-channel angular pressing and demonstrate grain re nement phenomena during the SPD simulations. We propose a new mechanism of grain subdivision related to the mobility of partial disclinations formed in strain-gradient regions during SPD.

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“…The evaluate dislocation density ρ in the grains of the samples were observed by STEM with Ham's intersection method [3]. The first procedure for Ham's intersection method is a mesh drawn on a TEM image of a grain satisfying the diffraction condition, and then the number of intersections m between the mesh and dislocations are counted.…”

Section: Methodsmentioning

confidence: 99%

The Effect of Reverse Strain on Microstructure and Strengthening of Copper Fabricated by Severe Plastic Deformation of Torsion Process

Wang¹,

Li²,

Fan³

et al. 2018

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The unidirectional single torsion process of commercially pure copper was followed by different number of reverse turns of torsion deformation. The effect of reverse strain on the material refinement and hardening was investigated. It is found that the grain refinement is significantly blocked in the reverse torsion strain in comparison with that only suffered in monotonic torsion strain. The strengthening slightly decreases with the torsional direction change. This phenomenon is interpreted in terms of the average dislocation density. A qualitative assumption is proposed to explain the retarded phenomenon of material refinement and hardening in the reverse torsion process. The reverse strain maybe improves the uniformity and stress-strain equilibrium of severe plastic deformation induced material.

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Dislocation density of pure copper processed by accumulative roll bonding and equal-channel angular pressing

Cited by 44 publications

References 13 publications

Dislocation Density and Texture in Copper Deformed by Cold Rolling and Ecap

Dislocation Density and Texture in Copper Deformed by Cold Rolling and Ecap

Grain Subdivision Mechanism Related to Partial Disclinations in Severe Plastic Deformation: A Molecular Dynamics Study

The Effect of Reverse Strain on Microstructure and Strengthening of Copper Fabricated by Severe Plastic Deformation of Torsion Process

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