The contribution of macroscopic shear bands to the rolling texture of FCC metals

1977 ◽  
Vol 11 (7) ◽  
pp. 581-585 ◽  
Author(s):  
J. Gil Sevillano ◽  
P. Van Houtte ◽  
E. Aernoudt
Keyword(s):  
Shear Bands ◽  
Rolling Texture ◽  
Fcc Metals

scholarly journals Rolling Texture of Cu–30%Zn Alloy Using Taylor Model Based on Twinning and Coplanar Slip

Crystals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1351
Author(s):  
Shih-Chieh Hsiao ◽  
Sin-Ying Lin ◽  
Huang-Jun Chen ◽  
Ping-Yin Hsieh ◽  
Jui-Chao Kuo
Keyword(s):  
Boundary Conditions ◽  
Shear Bands ◽  
Rolling Texture ◽  
Mechanical Twinning ◽  
Taylor Model ◽  
Slip Model ◽  
Fcc Metals ◽  
Model Based ◽  
First Approximation ◽  
Zn Alloy

A modified Taylor model, hereafter referred to as the MTCS(Mechanical-Twinning-withCoplanar-Slip)-model, is proposed in the present work to predict weak texture components in the shear bands of brass-type fcc metals with a twin–matrix lamellar (TML) structure. The MTCS-model considers two boundary conditions (i.e., twinning does not occur in previously twinned areas and coplanar slip occurs in the TML region) to simulate the rolling texture of Cu–30%Zn. In the first approximation, texture simulation using the MTCS-model revealed brass-type textures, including Y {1 1 1}⟨1 1 2⟩ and Z {1 1 1}⟨1 1 0⟩ components, which correspond to the observed experimental textures. Single orientations of C (1 1 2)[1 ¯ 1 ¯ 1] and S’ (1 2 3)[4¯ 1¯ 2] were applied to the MTCS-model to understand the evolution of Y and Z components. For the Y orientation, the C orientation rotates toward T (5 5 2)[1 1 5] by twinning after 30% reduction and then toward Y (1 1 1)[1 1 2] by coplanar slip after over 30% reduction. For the Z orientation, the S’ orientation rotates toward T’ (3 2 1)[2 1 ¯4¯] by twinning after 30% reduction and then toward Z (1 1 1)[1 0 1¯] by coplanar slip after over 30% reduction.

scholarly journals Development of Rolling Textures in an Austenitic Stainless Steel

1992 ◽  
Vol 19 (1-2) ◽  
pp. 101-121 ◽  
Author(s):  
C. D. Singh ◽  
V. Ramaswamy ◽  
C. Suryanarayana
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Shear Bands ◽  
Three Dimensional ◽  
Rolling Texture ◽  
Orientation Distribution ◽  
Distribution Functions ◽  
Texture Development ◽  
Slip Planes ◽  
Heterogeneous Deformation

Three dimensional texture analysis by means of orientation distribution functions (ODF) was used to examine the texture development during rolling at 473 K in an austenitic stainless steel. With the help of ODFs results, the different stages of texture development could be assigned to the existing theories of heterogeneous deformation mechanisms of low SFE face-centred cubic metals. The texture at very low degree of rolling consists of two limited orientation tubes with their fibre axes 〈110〉//ND and 〈110〉60∘ND and agrees with the predictions made by Taylor model. With further deformation, twinning causes the reduction of ≈{112}〈111〉 component and leads to the formation of twin {552}〈115〉. Abnormal slip on slip planes parallel to the twin boundaries rotates the twins into the {332}〈113〉 and {111}〈110〉 positions. The shear bands formation in the rotated twin-matrix lamellae changes their orientations near to {011}〈100〉 and {011}〈112〉 positions. Finally, normal slip again continues and sharpens the brass-type rolling texture.

Inhomogeneity of rolling texture in fcc metals

1980 ◽  
Vol 11 (5) ◽  
pp. 749-758 ◽  
Author(s):  
W. Truszkowski ◽  
J. Kr’ol ◽  
B. Major
Keyword(s):  
Rolling Texture ◽  
Fcc Metals

scholarly journals Study on the Microstructure and Texture of 3003 Aluminum Sheets Rolled by Laser-Textured Roll

2009 ◽  
Vol 2009 ◽  
pp. 1-6 ◽  
Author(s):  
Chunbo Cai ◽  
Zesheng Ji ◽  
Huajun Zhang ◽  
Guojun Wang
Keyword(s):  
Cold Rolling ◽  
Shear Bands ◽  
Alloy Sheet ◽  
Rolling Reduction ◽  
Aluminum Alloy Sheet ◽  
Shear Texture ◽  
X Ray ◽  
Fcc Metals ◽  
Aluminum Sheets ◽  
Evolution Of Microstructure

In order to improve the surface quality and formability of 3003 aluminum alloy sheet, laser-textured rolls are used in cold rolling. The influences of the cold rolling procedures with conventional and laser-textured rolls on the evolution of microstructure and texture were studied by the means of microstructural observations and X-ray texture analysis. Experimental results show that the microstructures are similar besides the samples rolled with laser-textured rolls containing a relatively larger amount of shear bands. The sheets deformed with conventional rolls have developed the typical rolling textures of FCC metals, which consist of Bs, Cu, and S components. However, the rolling textures of the sheets rolled with laser-textured rolls are comparatively weak, and the shear texture {001}〈110〉 is developed on the surface layer, but not observed in the intermediate layer of the sheet. The intensity of the rotated cube orientation increases with the increase of rolling reduction and then decreases after 90% rolling reduction.

Deformation Structure and Texture Transformations in Twinned Fcc Metals: Critical Role of Micro- and Macro- Scale Shear Bands

2007 ◽  
Vol 550 ◽  
pp. 521-526 ◽  
Author(s):  
Henryk Paul ◽  
Julian H. Driver
Keyword(s):  
Shear Banding ◽  
Critical Role ◽  
Shear Bands ◽  
Fcc Metals ◽  
Macro Scale ◽  
Local Lattice ◽  
Textural Changes ◽  
Scale Shear ◽  
Sem Analyses

Microstructure and texture development in twinned fcc metals is investigated in order to characterize the influence of micro- and macro-scale brass-type shear bands (SB) on structural and textural changes at large deformations. TEM and SEM analyses are focused on bands developed by plane strain compression in twinned C{112}<111> oriented single crystals. The proposed crystallographic model of the shear banding phenomenon refers to the idea of local lattice reorientation within narrow areas. Most of these rotations occur around the TD||<110> axis with significant further rotations about <112> poles. These two rotations explain the influence of SB’s on the formation of Goss{110}<001> and brass{110}<112>-S{123}<634> texture components clearly observed in highly deformed low SFE metals. At high deformations symmetrically equivalent crystal lattice rotations inside narrow areas lead to the formation of positive and negative macroscopic SBs.

Global and Local Structural Evolution during Deformation and Annealing of FCC Metals

2007 ◽  
Vol 550 ◽  
pp. 169-180 ◽  
Author(s):  
Niels Hansen
Keyword(s):  
Lamellar Structure ◽  
Structural Changes ◽  
Large Strain ◽  
Structural Evolution ◽  
Structural Difference ◽  
Rolling Texture ◽  
High Angle ◽  
Fcc Metals ◽  
Microstructural Parameters ◽  
Global And Local

Deformation of metals from medium to high strain significantly affect the deformation structure as well as the recovery and recrystallization behaviour when deformed samples are annealed. This behaviour is illustrated for FCC metals of medium to high stacking fault energy, with emphasis on the behaviour of aluminium and aluminium alloys deformed by cold rolling to large strain. The analysis encompasses hardness testing, EBSD and TEM. The deformation microstructure is a lamellar structure of dislocation boundaries and high angle boundaries where the percentages of the latter increases to about 60-80% at large strain. The macrotexture is a typical rolling texture, which is composed of individual texture components present as micrometre and submicrometre size volumes. In the lamellar structure correlations have been established between microstructural parameters and local orientations showing for example variations in stored energy between the texture components and large variations in the spatial distributions of the high angle lamellar boundaries. Such local variations can affect the structural coarsening during recovery at low temperature leading to significant structural difference on a local scale. The local variations in the deformed structure can also significantly affect the structural changes taking place locally during high temperature annealing thereby affecting the evolution of the structure and texture on a macroscopic scale.

The Development of Homo and Heterogeneous Rolling Microstructures in Rolled Low Carbon and Interstitial-Free Steel

2007 ◽  
Vol 558-559 ◽  
pp. 61-70
Author(s):  
B.J. Duggan ◽  
M.Z. Quadir ◽  
Y.Y. Tse ◽  
K. Shen ◽  
G.L. Liu ◽  
...  
Keyword(s):  
Shear Bands ◽  
Rolling Texture ◽  
Orientation Distribution ◽  
Systematic Investigation ◽  
Sharp Change ◽  
Interstitial Free ◽  
Low Carbon ◽  
Mesh Structure ◽  
Interstitial Free Steel ◽  
Grain Fragmentation

The relationship between the deformation orientation distribution function (ODF) and the primary recrystallised ODF in cold and warm rolled metals, is not a simple mathematical transformation from one to the other, but is through thermally activated processes occurring in the deformation microstructure. In BCC metals the mature rolling microstructure consists of cells, microbands and shear bands on a length scale of fraction of a micron, to deformation and transition bands at the grain scale, when this is of the order of 10 or more microns. There is evidence that grain boundary regions are sometimes distinct from grain interiors. Wherever there is a relatively sharp change in either orientation or microstructure such locations are potential sites of recrystallisation nuclei. In this paper the results of a systematic investigation of the development of microstructure in rolled interstitial free (IF) steel using both transmission and scanning electron microscopy are presented. It is shown how the dislocation mesh structure, formed at the earliest stages of rolling, develops into the mature microstructure consisting of cells, microbands and shear bands. Deformation heterogeneities in the microstructure, known to be of vital significance in the recrystallisation process are associated with the α and γ fibre components of the rolling texture. Shear band thickening and α grain fragmentation are also considered, since both processes can produce recrystallisation nuclei, which in the α fibre case can reduce desirable mechanical properties.

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