Texture evolution during multi-pass equal channel angular extrusion of copper: Neutron diffraction characterization and polycrystal modeling

Li, Saiyi; Beyerlein, Irene J.; Alexander, David; Vogel, Sven C.

doi:10.1016/j.actamat.2005.01.023

Cited by 142 publications

(103 citation statements)

References 33 publications

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“…To finish with the comparison in the case of one ECAP pass, it is interesting to remark than in the present steel the normalized intensity for C component is slightly lower than for the case of the FeMnCAl in [17]. However, in both cases the obtained intensity for C is clearly lower than in the case of a high-SFE metal as Cu [39,40,54].…”

Section: Discussionmentioning

confidence: 67%

“…In the second pass there is a negligible increase of texture strength, being the increase more remarkable after four passes. The analysis made in [17] shows that normally high-SFE metals show no increase of texture strength between 2 and 4 passes, which could be related to a saturation of deformation mechanisms [17,40,54]. However, for metals with low-SFE such as silver or the FeMnCal TWIP steel which deform by twinning [17,53], an increase of the texture strength has been reported.…”

Section: Discussionmentioning

confidence: 97%

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Equal channel angular pressing of a TWIP steel: microstructure and mechanical response

et al. 2017

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A Fe-20.1Mn-1.23Si-1.72Al-0.5C TWIP steel with ultra-fine grain structure was successfully processed through Equal Channel Angular Pressing (ECAP) at warm temperature up to four passes following the BC route. The microstructure evolution was characterized by Electron Back Scattered Diffraction (EBSD) to obtain the grain maps, which revealed an obvious reduction of grain size, as well as a decrease of the twin fraction, with increasing number of ECAP passes. The texture evolution during ECAP was analyzed by Orientation Distribution Function (ODF). The results show that the annealed material presents Brass (B) as dominant component. After ECAP, the one pass sample presents A1 * and A2 * as the strongest components, while the two passes and four passes samples change gradually towardcomponents. TEM analysis shows that all samples present twins. The twin thickness is reduced with increasing the number of ECAP passes. Nano-twins, as a result of secondary twinning, are also observed in the one and two passes samples. In the four passes sample the microstructure is extensively refined by the joint action of ultra-fine subgrains, grains and twins. The mechanical behavior was studied by tensile samples and it was found that the yield strength and the ultimate tensile strength are significantly enhanced at increasing number of ECAP passes. Although the ductility and strain hardening capability are reduced with ECAP process, the present TWIP steel shows significant uniform deformation periods with positive work-hardening rates.

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Section: Discussionmentioning

confidence: 67%

Section: Discussionmentioning

confidence: 97%

Equal channel angular pressing of a TWIP steel: microstructure and mechanical response

et al. 2017

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“…In practice, the evolution of texture during ECAP has been well predicted using these three shear systems plus the {111}<112> A* system [8,10,29,30]. However, the activation of the A* shear system is questionable because there is no evidence directly confirming the existence of the <112> Burgers vector in aluminium alloys at strains up to 4.…”

Section: Texture Evolution During Shear Deformation: the Significancementioning

confidence: 99%

“…Several reports on modelling of the texture evolution during ECAP assume the existence of all four shear systems as listed in Table 1 [8][9][10][11]. Thus, all of the models consider shear in one shear direction and, in order to explain the observed textures, all four shear systems must be included.…”

Section: Introductionmentioning

confidence: 99%

“…The texture evolution in ECAP was modelled in several reports [8][9][10][11]. This work has been based on the notion that, under ideal ECAP conditions, the deformation occurring in ECAP may be approximated by simple shear along a single plane crossing the ECAP channel [12,13] where this plane corresponds to the intersection of the two channels lying perpendicular to plane Y' in Fig.…”

Section: Introductionmentioning

confidence: 99%

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Texture evolution by shear on two planes during ECAP of a high-strength aluminum alloy

et al. 2008

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The evolution of texture was examined during equal-channel angular pressing (ECAP) of an Al-Zn-Mg-Cu alloy having a strong initial texture. An analysis of the local texture using electron back-scatter diffraction demonstrates that shear occurs on two shear planes: the main shear plane (MSP) equivalent to the simple shear plane, and a secondary shear plane which is perpendicular to the MSP. Throughout most regions of the ECAP billet, the MSP is close to the intersection plane of the two channels but with a small (5˚) deviation. Only the {111}<110> and {001}<110> shear systems were activated and there was no experimental evidence for the existence of other shear systems. In a small region at the bottom edge of the billet that passed through the zone of intersection of the channels, the observed textures were fully consistent with the rolling textures of Copper and Goss.

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Grain Refinement in Metallic Systems Processed by ECAP

Valiev¹,

Zhilyaev²,

Langdon³

2013

Bulk Nanostructured Materials

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Texture evolution during multi-pass equal channel angular extrusion of copper: Neutron diffraction characterization and polycrystal modeling

Cited by 142 publications

References 33 publications

Equal channel angular pressing of a TWIP steel: microstructure and mechanical response

Equal channel angular pressing of a TWIP steel: microstructure and mechanical response

Texture evolution by shear on two planes during ECAP of a high-strength aluminum alloy

Grain Refinement in Metallic Systems Processed by ECAP

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