scholarly journals Local Textures in Deformed and Recrystallized Aluminium Crystal

1993 ◽  
Vol 20 (1-4) ◽  
pp. 141-154 ◽  
Author(s):  
A. Akef ◽  
J. H. Driver
Keyword(s):  
Single Crystals ◽  
Plane Strain ◽  
Crystal Orientation ◽  
Recrystallization Texture ◽  
True Strain ◽  
Plane Strain Compression ◽  
Deformation Bands ◽  
Transition Band ◽  
Complete Recrystallization

The recrystallization mechanisms in deformed aluminium single crystals have been investigated by SEM microdiffraction techniques (ECP and EBSP). Aluminium crystals of (001)(uv0) and (001)[011-] orientations were deformed in plane strain compression to a true strain of ~1 to develop different deformation microstructures. Transition bands separating deformation bands were formed by orientation splitting in the (001)(uv0) crystals, but were not observed in the (001)[011-] crystal.During annealing at 250°C and 400°C, recrystallization nuclei are developed in both the deformed matrix and along transition bands. Matrix nucleation appears to occur by a subgrain coalescence mechanism according to which the new grains are misoriented 15-30° from the average as-deformed material. Transition band nucleation gives an orientation spread 20-30° around the original, undeformed crystal orientation. A well-defined cube recrystallization texture is obtained at 400°C after complete recrystallization of the initial cube crystal.

The anisotropy of Al-4 Wt Pet Cu single crystals tested in plane-strain compression

1976 ◽  
Vol 7 (12) ◽  
pp. 1867-1871
Author(s):  
Suphal P. Agrawal ◽  
William F. Hosford
Keyword(s):  
Single Crystals ◽  
Plane Strain ◽  
Plane Strain Compression

scholarly journals A Microstructure Investigation of the Deformation and Recrystallization of Particle-Containing Aluminium-Silicon Alloys

1993 ◽  
Vol 20 (1-4) ◽  
pp. 125-140 ◽  
Author(s):  
F. Habiby ◽  
F. J. Humphreys
Keyword(s):  
Single Crystals ◽  
Recrystallization Texture ◽  
Rolling Texture ◽  
Plasticity Theory ◽  
Second Phase ◽  
Slip Systems ◽  
Deformation Bands ◽  
Silicon Alloys ◽  
X Ray ◽  
Second Phase Particles

Single crystals and polycrystals of aluminium containing non-deformable second-phase particles of silicon, have been deformed, and the resultant structures investigated by microscopy and by X-ray and microtexture techniques. The particle size is found to influence the scale of the deformation bands formed, and there is evidence that particles may affect the nucleation of these bands. The deformed materials were recrystallized, and the effect of particle stimulated nucleation on the weakening of the rolling texture is discussed with reference to a computer simulation. In contrast, the recrystallization texture of particle-containing single crystals deformed on only two slip systems is sharp, and it is shown that the texture components are consistent with plasticity theory.

Formation Process of Texture in AZ80 Alloy during High Temperature Plane Strain Compression Deformation

2011 ◽  
Vol 702-703 ◽  
pp. 340-343
Author(s):  
Jinuk Kim ◽  
Kazuto Okayasu ◽  
Hiroshi Fukutomi
Keyword(s):  
Plane Strain ◽  
Formation Process ◽  
True Strain ◽  
Extrusion Direction ◽  
Fiber Texture ◽  
Plane Strain Compression ◽  
Compression Direction ◽  
Compression Deformation ◽  
Pole Figures ◽  
Az80 Alloy

Formation process of textures in AZ80 is investigated on polycrystal specimens with different initial textures by plane strain compression deformation at 673 K and 723 K with strain rates between 5.0×10-4s-1 and 5.0×10-2s-1. Three kinds of specimens were taken out from the extruded bars with (direction of the extrusion) fiber texture by changing the geometrical relationship with the extrusion direction. In the case of the specimen having parallel to the compression direction before deformation, the initial fiber texture gradually transformed into several orientations with increasing strain at 723K with a strain rate of 5.0×10-2s-1. oriented grains, which was not seen in the pole figures before deformation appeared after the deformation up to -1.0 in true strain. The other two kinds of specimens have compression directions perpendicular to direction. The textures after deformation of these two kinds of specimens also consisted of several components. Some of them are common among the three kinds of specimens and the others are retained components of the initial texture.

Accommodation of constrained deformation in f. c. c. metals by slip and twinning

1969 ◽  
Vol 309 (1499) ◽  
pp. 433-456 ◽  
Keyword(s):  
Shear Stress ◽  
Single Crystals ◽  
Plane Strain ◽  
Plane Strain Compression ◽  
Orientation Factor ◽  
Cubic Crystals ◽  
Constrained Deformation ◽  
Critical Resolved Shear Stress ◽  
Good Agreement ◽  
External Strain

The problem of accommodation of constrained deformation by slip and twinning has been analysed. The analysis is based on Taylor’s least work hypothesis. In this analysis, the operative combination of slip and twinning systems is found by minimizing the orientation factor M = (∑ i s i +α∑ i t i )/ ε , where s i and t i are the simple shears resulting from slip and twinning respectively, α is the ratio of the critical resolved shear stress for twinning against slip, and Ɛ is the external strain. Detailed calculations have been made for face-centred cubic crystals deformed by plane strain compression. Experimental observations on deformed single crystals of a Co–8% Fe alloy indicate good agreement with the analysis. Implications of the present study to the twinning observations of Heye & Wassermann on rolled Ag crystals are discussed.

Anisotropy of strength in single crystals under plane strain compression

1966 ◽  
Vol 14 (4) ◽  
pp. 467-476 ◽  
Author(s):  
G.Y Chin ◽  
E.A Nesbitt ◽  
A.J Williams
Keyword(s):  
Single Crystals ◽  
Plane Strain ◽  
Plane Strain Compression

Grain Refinement by High Temperature Plane-Strain Compression of Fe-2%Si Steel

2006 ◽  
Vol 503-504 ◽  
pp. 977-982
Author(s):  
Pablo Rodriguez-Calvillo ◽  
Ana Carmen C. Reis ◽  
Leo Kestens ◽  
Yvan Houbaert
Keyword(s):  
Plane Strain ◽  
Grain Refinement ◽  
Volume Fraction ◽  
Orientation Imaging Microscopy ◽  
Plane Strain Compression ◽  
Initial Structure ◽  
Deformation Bands ◽  
Engineering Strain ◽  
Post Process ◽  
Average Size

An Fe-2%Si alloy, which was designed for electromagnetic applications was submitted to a series of plane strain compression (PSC) tests with reductions of 25, 35 and 75% at temperatures varying from 800 to 1,100°C and at a constant engineering strain rate corresponding to a constant cross velocity of 20 mm/s. The initial structure of the material displayed nearly equi-axed grains with an average size of 80 μm. The as-received texture was characterised by a nearly random cube fibre (<100>//ND) with a relatively weak maximum on the rotated cube component ({001}<110>). After deformation the samples were water quenched in order to avoid post-process static recrystallization events. The microstructures were analysed by orientation imaging microscopy (OIM) revealing that the zone of PSC was restricted to the central layers of the sample but minimally covering 50% of the sample thickness. After deformation at 800°C the conventional lamellar deformation structures were observed on the sections perpendicular to the transverse direction of PSC. At higher deformation temperatures the structure was of a bimodal nature consisting of lamellar deformation bands and equi-axed small grains. The volume fraction of these small equi-axed grains increased from 19.9% after 75%reduction at 800°C to 67.8% after 75% reduction at 1.100°C. After 75% reduction the equi-axed grains exhibited an average size of 10 μm which represents a strong grain refinement with respect to the initial size of 80 μm prior to PSC. Ferrite Silicon steels undergo extensive dynamic recovery during hot working. Dynamic recrystallization (DRX), though, has not yet been reported for these alloys although the present data suggest that a DRX mechanism might be responsible for the remarkable grain refinement after relatively low amounts of strain applied at high temperatures.

Lateral constraints in plane strain compression of single crystals

1971 ◽  
Vol 2 (8) ◽  
pp. 2093-2096 ◽  
Author(s):  
B. C. Wonsiewicz ◽  
G. Y. Chin ◽  
R. R. Hart
Keyword(s):  
Single Crystals ◽  
Plane Strain ◽  
Plane Strain Compression
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