Microstructure and texture of rolled {112}〈111〉 copper single crystals

Köhlhoff, G.; Malin, A.S.; Lücke, K.; Hatherly, M.

doi:10.1016/0001-6160(88)90130-7

Cited by 49 publications

(19 citation statements)

References 7 publications

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“…However, the details of the transformations from C T to G and then to brass or S are not clear, because at higher deformation degrees, the laminar structure of fine alternating twinmatrix (T-M) layers aligns with the compression (rolling) plane. [15][16][17][18] This cannot introduce texture components in the vicinity of the G and brass orientations because that would require a rotation in the opposite direction. [11,19] In a model of texture transformation described by Hirsch et al, [18,20] the C T oriented lamellae rotate to the "intermediate orientation" of {111}Ͻ112Ͼ (Y), and then they rotate to the Goss orientation by the process of shear banding.…”

Section: Introductionmentioning

confidence: 99%

Brass-type shear bands and their influence on texture formation

Paul

Morawiec

Piątkowski

et al. 2004

Metall Mater Trans A

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The issues of brass-type shear band formation and the evolution of band microtexture components are addressed. The analysis is based on bands developed by plane strain compression in twinned {112}Ͻ111Ͼ oriented copper single crystals deformed at 77 K. Substantial progress in understanding the formation of the bands was possible thanks to systematic local orientation measurements using transmission electron microscopy (TEM). The TEM orientation maps allowed investigation of the way in which unstable behavior of twin-matrix layers leads to the brass-type shear bands. It has been found that several important transitions of the deformation textures are correlated with shear banding. Early stages of shear band formation are the result of the equally effective operation of two coplanar slip systems on the {111} slip planes. This process leads to the lattice rotation about the Ͻ110Ͼ axis and to the rise of Goss orientation. For well-developed shear bands, a second rotation about the Ͻ112Ͼ direction is observed. It is accompanied by activation of new slip systems. The observed disappearance of matrix components from the shear band microtexture is the result of twinning within reoriented matrix lamellae. In the twin-oriented areas, the dominance of one of two coplanar slip systems ultimately leads to the formation of the brass texture component.

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Section: Introductionmentioning

confidence: 99%

Brass-type shear bands and their influence on texture formation

Paul

Morawiec

Piątkowski

et al. 2004

Metall Mater Trans A

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“…However, many other experiments also processed a series of copper single crystals with random orientations at RT and at low strain rate by ECAP [10,21] or other deformation methods, [22][23][24][25] only a few of deformation twins were observed. The generation of abundant deformation twins in the current Cu single crystal at low strain rate and at RT may mainly be due to the following reasons.…”

Section: Resultsmentioning

confidence: 99%

Orientation Design for Enhancing Deformation Twinning in Cu Single Crystal Subjected to Equal Channel Angular Pressing

Han¹,

Sheng²,

Huang³

et al. 2008

Adv Eng Mater

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Slip and twinning are two major mechanisms in plastic deformation of crystalline materials; however, twinning is extremely difficult to occur in face‐centered‐cubic crystals under conventional conditions. The authors show that twinning becomes an active deformation mode in copper single crystal when subjected to equal channel angular pressing at room temperature. In particular, the observations revealed that deformation twinning became more active in the copper single crystal having a proper crystallographic orientation.

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“…[4][5][6][7][8][9][10] A summary of the observations of deformation twinning are provided in Table 1 in ref. 11). A constitutive equation developed by Meyer et al based on dislocation dynamics predicted that the deformation twinning in copper can be expected at extremely low temperature and high strain rate.…”

Section: Introductionmentioning

confidence: 99%

“…3) Shear bands are a form of plastic instability, which occurs in many metals and alloys including copper. The formation mechanism of shear bands in pure copper has been intensively studied, 1,4,11) and frequently attributed to deformation twinning without clear evidence. 1,11) However, there are limited studies where deformation twinning was observed in copper deformed by cold rolling, 11) cross-rolling, or a combination of compression and rolling.…”

Section: Introductionmentioning

confidence: 99%

“…The formation mechanism of shear bands in pure copper has been intensively studied, 1,4,11) and frequently attributed to deformation twinning without clear evidence. 1,11) However, there are limited studies where deformation twinning was observed in copper deformed by cold rolling, 11) cross-rolling, or a combination of compression and rolling. 12,13) In our previous research, we observed deformation twinning and associated shear bands metallographically in copper single crystals that had a specific initial orientation after one pass of equalchannel angular pressing (ECAP).…”

Section: Introductionmentioning

confidence: 99%

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Formation of Deformation Twins and Related Shear Bands in a Copper Single Crystal Deformed by Equal-Channel Angular Pressing for One Pass at Room Temperature

Miyamoto¹,

Vinogradov

Hashimoto

et al. 2009

Mater. Trans.

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Deformation twinning, which is extremely difficult to produce in face-centered cubic (FCC) crystals with medium to high stacking fault energy (SFE), was observed in pure copper single crystals with an appropriate crystallographic orientation subjected to equal-channel angular pressing (ECAP) for one pass at room temperature. Dense shear bands were also observed, delineated by large-angle grain boundaries, and with close to a twinning relation with the matrix, suggesting the role of deformation twinning at their nucleation sites. The activation of deformation twinning is rationalized by a favorable crystallographic orientation and predominant dislocation density in a primary slip system.

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Microstructure and texture of rolled {112}〈111〉 copper single crystals

Cited by 49 publications

References 7 publications

Brass-type shear bands and their influence on texture formation

Brass-type shear bands and their influence on texture formation

Orientation Design for Enhancing Deformation Twinning in Cu Single Crystal Subjected to Equal Channel Angular Pressing

Formation of Deformation Twins and Related Shear Bands in a Copper Single Crystal Deformed by Equal-Channel Angular Pressing for One Pass at Room Temperature

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