The transformation of slip
dislocations during twinning of
copper-aluminum alloy crystals

Basinski, Z. S.; Szczerba, M.J.; Niewczas, M.; Embury, J.D.; Basinski, S.J.

doi:10.1051/metal/199794091037

Cited by 181 publications

(66 citation statements)

References 2 publications

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“…[3][4][5][6] The latent hardening model has typically been used to describe dislocation-twin interaction in crystal plasticity frameworks that generally give good prediction of the measured stress-strain curves. [7,8] However, the latent hardening model may be too simplified to incorporate detailed accommodation mechanisms around twins that were experimentally observed, which include (1) glide dislocations' dissociation at the twin boundary (TB), [4,9,10] (2) transmutation of existing matrix dislocations into the twin lattice, [11][12][13][14][15] (3) formation of kink bands or secondary twins at the twin-twin intersection, [4,10,16,17] etc. Furthermore, cracks can sometimes nucleate at twin-twin or twingrain boundary intersections because of local shear incompatibility.…”

mentioning

confidence: 99%

Study of $$ \{ 11\bar{2} 1\} $$ Twinning in α-Ti by EBSD and Laue Microdiffraction

Wang

Barabash

Bieler

et al. 2013

Metall Mater Trans A

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Activity of the f11 " 21gh " 1 " 126i extension twinning (T2) mode was analyzed in a commercial purity Ti sample after 2 pct tensile strain imposed by four-point bending. The sample had a moderate c-axis fiber texture parallel to the tensile axis. Compared with the many f10 " 12gh " 1011i extension (T1) twins that formed in 6 pct of the grains, T2 twins were identified in 0.25 pct of the grains by scanning electron microscopy (SEM) and electron backscattered diffraction (EBSD) maps. Most of the T2 twins exhibited irregular twin boundaries (TBs) on one side of the twin. Highresolution EBSD revealed both intermediate orientations at some matrix/twin interfaces and substantial lattice rotation within some T2 twins. Interactions between matrix hc + ai dislocations 1 3 h1 " 213i and a f11 " 21g T2 twin were investigated by combining SEM/EBSD slip trace characterization and Laue microdiffraction peak streak analysis. hc + ai dislocations that originally glided on a pyramidal plane in the matrix were found on other planes in both the matrix and the twin, which was attributed to extensive cross-slip of the screw component, whose Burgers vector was parallel to the twinning plane. On the other hand, thickening of the twin could engulf some pile-up edge components in front of the TB. During this process, these hc + ai dislocations transmuted from a pyramidal plane ð0 " 111Þ in the matrix to a prismatic plane ð " 1010Þ T in the twin lattice. Finally, possible mechanisms for the nucleation and growth of T2 twins will be discussed.

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confidence: 99%

Study of $$ \{ 11\bar{2} 1\} $$ Twinning in α-Ti by EBSD and Laue Microdiffraction

Wang

Barabash

Bieler

et al. 2013

Metall Mater Trans A

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“…Experimental evidence of this theory is provided in Refs. 21,22) According to the later theory, a dense dislocation boundary tends to split after generating a considerable misorientation (>1.5°) and, thus, a pair of microband boundaries evolves. 3,4,23) The resultant misorientations of the newly-formed pair remain equal to the original boundary and, therefore, they are related by opposite rotations to each other.…”

Section: Discussionmentioning

confidence: 99%

Unusual Crystallographic Aspects of Microband Boundaries within {111}^|^lt;110^|^gt; Oriented Grains in a Cold Rolled Interstitial Free Steel

et al. 2014

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Microbands are well-known deformation features that generate in the rolling microstructures of many metals and alloys. The boundaries across two neighbouring microbands are comprised of dense dislocation walls and they accommodate a small average crystallographic rotation in the range of 1-4°. In this study, a combination of high resolution electron backscattered diffraction (EBSD) and transmission electron microscopy (TEM) was used to observe orientation differences of up to 20° across microband boundaries in the rolling substructures of {111}<110> oriented grains in steel. Despite their high angle nature, the microband interfaces maintain their well-known crystallographic characteristics, by being closely aligned with highly stressed slip planes. Rigid body rotations are argued to take place around the interface normal between adjacent microband lattices. This results in an unusual microstructure whereby alternating microband boundaries, oriented in equal and opposite relative angles, produce an array of orientation pairs in their spatial distributions.

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“…The high work hardening rates in stainless steels is complex because it involves four factors (a) the extent of the transformation to martensite (b) The storage of the dislocation in the parent austenite (c) the transformation of the dislocation structure by the martensite transformation and (d) the influence of interstitial on the stability of the dislocation structure. The detailed crystallography of the transformation of dislocations by twinning has been discussed by Basinski et al [11,12]. And indicates that some sessile dislocations are formed from the glide dislocations in the parent phase.…”

Section: Macroscopic Compositesmentioning

confidence: 99%

A Survey of Processing Methods for High Strength-High Conductivity Wires for High Field Magnet Applications

Embury

Han

2004

Megagauss Magnetic Field Generation, Its Application to Science and Ultra-High Pulsed-Power Technology

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The transformation of slip dislocations during twinning of copper-aluminum alloy crystals

Cited by 181 publications

References 2 publications

Study of $$ \{ 11\bar{2} 1\} $$ Twinning in α-Ti by EBSD and Laue Microdiffraction

Study of $$ \{ 11\bar{2} 1\} $$ Twinning in α-Ti by EBSD and Laue Microdiffraction

Unusual Crystallographic Aspects of Microband Boundaries within {111}^|^lt;110^|^gt; Oriented Grains in a Cold Rolled Interstitial Free Steel

A Survey of Processing Methods for High Strength-High Conductivity Wires for High Field Magnet Applications

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