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

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.

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Étude expérimentale de l'hétérogénéité de la déformation lors de l'essai de la compression plane de monocristauxExperimental study of the inhomogeneous deformation in the plane strain compression test of single crystals

Mécanique & Industries ◽

10.1016/s1296-2139(02)01200-9 ◽

2002 ◽

Vol 3 (6) ◽

pp. 545-556 ◽

Cited By ~ 2

Author(s):

M Fares

Keyword(s):

Single Crystals ◽

Plane Strain ◽

Compression Test ◽

Etude Expérimentale ◽

Plane Strain Compression ◽

Inhomogeneous Deformation ◽

Plane Strain Compression Test ◽

Étude Expérimentale

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

Proceedings of the Royal Society of London Series A - Mathematical and Physical Sciences ◽

10.1098/rspa.1969.0051 ◽

1969 ◽

Vol 309 (1499) ◽

pp. 433-456 ◽

Cited By ~ 81

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.

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