Influences of crystallographic orientations on deformation mechanism and grain refinement of Al single crystals subjected to one-pass equal-channel angular pressing

Han, Wei‐Zhong; Zhang, Zhefeng F; Sheng, Wu; Li, S X

doi:10.1016/j.actamat.2007.07.008

Cited by 44 publications

(7 citation statements)

References 38 publications

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“…During the last two decades, bulk ultrafine grained (UFG) or nanocrystalline (NC) materials have been investigated extensively due to their new physical and enhanced mechanical properties. [1][2][3] Various approaches based on severe plastic deformation (SPD)-induced grain refinement have been developed for synthesizing UFG/NC materials, including equal-channel angular pressing (ECAP), [4][5][6][7][8][9][10][11][12][13][14] highpressure torsion (HPT), [15][16][17] accumulative roll bonding (ARB), 18 low temperature rolling (LTR), 19 and dynamic plastic deformation (DPD). [20][21][22] Among them, ECAP is considered as one of the most important and efficient SPD methods to produce bulk UFG materials while maintaining their original geometry.…”

Section: Introductionmentioning

confidence: 99%

Influence of stacking-fault energy on the accommodation of severe shear strain in Cu-Al alloys during equal-channel angular pressing

Lin

et al. 2009

J. Mater. Res.

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X-ray diffraction (XRD) and transmission electron microscope (TEM) investigations have been carried out to decode the influence of stacking-fault energy (SFE) on the accommodation of large shear deformation in Cu-Al alloys subjected to one-pass equal-channel angular pressing. XRD results exhibit that the microstrain and density of dislocations initially increased with the reduction in the SFE, whereas they sharply decreased with a further decrease in SFE. By systematic TEM observations, we noticed that the accommodation mechanism of intense shear strain was gradually transformed from dislocation slip to deformation twin when SFE was lowered. Meanwhile, twin intersections and internal twins were also observed in the Cu-Al alloy with extremely low SFE. Due to the large external plastic deformation, microscale shear bands, as an inherent deformation mechanism, are increasingly significant to help carry the high local plasticity because low SFE facilitates the formation of shear bands.

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Section: Introductionmentioning

confidence: 99%

Influence of stacking-fault energy on the accommodation of severe shear strain in Cu-Al alloys during equal-channel angular pressing

Lin

et al. 2009

J. Mater. Res.

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“…3(f)). A shear factor [25] calculation for the green coarse grain marked by an oval circle shows that it has only two slip systems with shear factor values larger than 0.5 (i.e., 0.97 and 0.55). Because of the limited active slip systems in these grains, subdivision of such coarse grains into fine subgrains and subsequently their further transformation into grains delimited by HABs is difficult.…”

Section: Microstructure Of Al-5cu Processed By Ecapmentioning

confidence: 99%

The deformation and work hardening behaviour of a SPD processed Al-5Cu alloy

Jia

Bjørge

Marthinsen

et al. 2017

Journal of Alloys and Compounds

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An Al-5 wt.% Cu alloy supersaturated with Cu in solid solution was subjected to equal channel angular pressing (ECAP). The microstructural evolution was systematically investigated by backscattered electron (BSE) imaging, electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). It is revealed that a bimodal grain structure composed of coarse micron-sized grains and submicron-sized grains was developed after four passes of ECAP. Tensile testing showed that a high ultimate tensile strength of ~500 MPa, a high elongation to failure of ~28% and a uniform elongation of ~5% were achieved simultaneously. The deformation behaviour and the grain structure evolution during ECAP, the strengthening mechanisms of the as-deformed material, and especially, the role played by a high content of Cu have been discussed.

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“…25,26 Such crystallographic design of the single crystal will greatly activate deformation twinning. The crystallographic orientation of the Cu single crystal was specially designed to make one of twinning systems, such as ͑111͓͒112͔, just on the macroscopic shear deformation plane of ECAP, which has been described in more detail previously.…”

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confidence: 99%

Origin of deformation twinning from grain boundary in copper

Han

et al. 2008

Applied Physics Letters

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The occurrence of deformation twinning in face-centered-cubic (fcc) crystals with medium to high stacking fault energy is normally very difficult. Through specially designing the orientation of Cu single crystal, the authors do not only observe profuse nanoscale deformation twins with a tower shape originating from grain boundary but also find some of them terminated in the interior of the grain. The observations clearly prove that the deformation twinning can nucleate through successively emitting partials from grain boundaries, indicating the ubiquity of deformation twinning even in those fcc single crystals deformed at suitable conditions.

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Influences of crystallographic orientations on deformation mechanism and grain refinement of Al single crystals subjected to one-pass equal-channel angular pressing

Cited by 44 publications

References 38 publications

Influence of stacking-fault energy on the accommodation of severe shear strain in Cu-Al alloys during equal-channel angular pressing

Influence of stacking-fault energy on the accommodation of severe shear strain in Cu-Al alloys during equal-channel angular pressing

The deformation and work hardening behaviour of a SPD processed Al-5Cu alloy

Origin of deformation twinning from grain boundary in copper

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