Formation of Cu-type shear bands and their influence on deformation and texture of rolled f.c.c. {112}〈111〉 single crystals

Wagner, Philipp; Engler, Olaf; Lücke, K.

doi:10.1016/0956-7151(95)90164-7

Cited by 163 publications

(90 citation statements)

References 13 publications

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“…This change in slip activity causes the interface to (Fig. 1c,d) 44 . Once the interface changes to {112}o1114Cu(C)||{112}o1104Nb, it easily twins on the same (111) T-plane, reorienting the interface to {552}o1 1 54Cu||{112}o1104Nb (Fig.…”

Section: Resultsmentioning

confidence: 99%

High-strength and thermally stable bulk nanolayered composites due to twin-induced interfaces

Zheng

Beyerlein

Carpenter³

et al. 2013

Nat Commun

308

156

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Bulk nanostructured metals can attribute both exceptional strength and poor thermal stability to high interfacial content, making it a challenge to utilize them in high-temperature environments. Here we report that a bulk two-phase bimetal nanocomposite synthesised via severe plastic deformation uniquely possesses simultaneous high-strength and high thermal stability. For a bimetal spacing of 10 nm, this composite achieves an order of magnitude increase in hardness of 4.13 GPa over its constituents and maintains it (4.07 GPa), even after annealing at 500°C for 1 h. It owes this extraordinary property to an atomically well-ordered bimaterial interface that results from twin-induced crystal reorientation, persists after extreme strains and prevails over the entire bulk. This discovery proves that interfaces can be designed within bulk nanostructured composites to radically outperform previously prepared bulk nanocrystalline materials, with respect to both mechanical and thermal stability.

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Section: Resultsmentioning

confidence: 99%

High-strength and thermally stable bulk nanolayered composites due to twin-induced interfaces

Zheng

Beyerlein

Carpenter³

et al. 2013

Nat Commun

308

156

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“…In metals with a low SFE, brass-type SBs can be readily observed after medium deformations, e.g. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. They develop within the microstructures characterized by thin twin-matrix lamellae.…”

Section: Introductionmentioning

confidence: 99%

“…(i) Shear bands are not observed in microstructures dominated by equiaxed dislocation cells and near isotropic properties [22]. (ii) Shear banding is preceded by the formation of essentially planar obstacles to homogeneous dislocation glide [7][8][9][10][11][17][18][19]. (iii) Two groups of SBs can be distinguished according to the SFE.…”

Section: Introductionmentioning

confidence: 99%

“…In metals of a medium-to-high SFE, copper-type SBs are formed against the background of band-like dislocation structures of elongated cells (micro-bands), e.g. [6][7][8][9][10][11]. (iv) Shear banding tends to become increasingly difficult in metals of very high SFE, and so have not always been observed in high purity aluminium [23].…”

Section: Introductionmentioning

confidence: 99%

“…Shear bands (SBs) or their compact clusters, called macroscopic shear bands (MSBs), are frequently observed examples of unstable behaviour of fcc metallic materials at large strains, e.g. [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. However, their formation and development within the as-deformed structures * INSTITUTE OF METALLURGY AND MATERIALS SCIENCE, PAS, 25 REYMONTA STR., 30-059 KRAKÓW, POLAND # Corresponding author: h.paul@imim.pl and their influence on the overall texture evolution are still not completely understood [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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Deformation Microstructure And Texture Transformations In FCC Metals Of Medium-To-High Stacking Fault Energy: Critical Role Of Micro- And Macro-Scale Shear Bands

Paul¹,

Miszczyk²

2015

Archives of Metallurgy and Materials

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Microstructure and texture development in medium-to-high stacking fault energy face centred cubic metals were investigated in order to examine the role of lattice re-orientation on slip propagation across grain boundaries and to characterize the influence of micro-and macro-scale copper-type shear bands on textural changes at large deformations. Polycrystalline pure copper (fine -and coarse -grained) and fine-grained AA1050 alloy were deformed in plane strain compression at room temperature to form two sets of well-defined macroscopic shear bands. The deformation-induced sub-structures and local changes in crystallographic orientations were investigated mostly by scanning electron microscopy equipped with high resolution electron backscattered facility. In all the deformed grains within macro-shear bands a strong tendency to strain-induced re-orientation was observed. The flat, strongly deformed grains exhibited a deflection within narrow areas. The latter increased the layers' inclination with respect to ED and led to kink-type bands, which are the precursors of MSBs. The mechanism of macro-/ micro-shear bands formation is strictly crystallographic since in all the areas of the sheared zone, the crystal lattice rotated such that one of the {111} slip planes became nearly parallel to the shear plane and the <011> direction became parallel to the direction of maximum shear. This strain-induced crystal lattice rotation led to the formation of specific macro-/ micro-shear bands components that facilitated slip propagation across the grain boundaries without any visible variation in the slip direction.Keywords: Shear bands, Texture, SEM/EBSD, Copper, AA1050 alloy, Plane strain compression W pracy badano zmiany strukturalne i teksturowe w metalach o sieci regularnej ściennie centrowanej związane z lokalną re--orientacją sieci krystalicznej wynikającą z formowania się mikro-i makro-pasm ścinania. Analizowano polikrystaliczne próbki miedzi oraz aluminium o czystości technicznej (stop AA1050) odkształcane w temperaturze otoczenia w próbie nieswobodnego ściskania do zakresu odkształceń, w których następuje wyraźne uformowanie się dwóch rodzin makroskopowych pasm ścinania. W badaniach wykorzystano skaningowy mikroskop elektronowy wyposażony w system automatycznego pomiaru orientacji lokalnych. Zaobserwowano, że w ziarnach umiejscowionych w obszarze makroskopowych pasm ścinania występuje ściśle zdefiniowana tendencja rotacji sieci krystalicznej, w wyniku której jedna z płaszczyzn typu {111} przyjmuje położenie zbliżone do położenia płaszczyzny ścinania, a jeden z kierunków typu <110> (lub <112> ) wykazuje tendencję do sytuowania się równolegle do kierunku ścinania. Obserwowana w obszarze wnętrza pasm ścinania rotacja prowadzi do uformowania się specyficznej (mikro)tekstury, która umożliwia propagację poślizgów poprzez granice ziaren bez 'istotnej' zmiany kierunku ścinania.

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Grain Subdivision and Its Effect on Texture Evolution in an Aluminum Alloy Under Plane Strain Compression

Mao

et al. 2013

Light Metals 2013

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Formation of Cu-type shear bands and their influence on deformation and texture of rolled f.c.c. {112}〈111〉 single crystals

Cited by 163 publications

References 13 publications

High-strength and thermally stable bulk nanolayered composites due to twin-induced interfaces

High-strength and thermally stable bulk nanolayered composites due to twin-induced interfaces

Deformation Microstructure And Texture Transformations In FCC Metals Of Medium-To-High Stacking Fault Energy: Critical Role Of Micro- And Macro-Scale Shear Bands

Grain Subdivision and Its Effect on Texture Evolution in an Aluminum Alloy Under Plane Strain Compression

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