Shear Band Formation in Al-2mass%Cu Single Crystals Containing ϑ Precipitates

Abstract

has been investigated in rolled single crystals of an Al-2%Cu alloy based on observations of slip bands precipitates, shear bands were not formed in (011)[100] crystals but in (211)[111] crystals during rolling at room temperature. Increase in the temperature up to 473K resulted in rather homogeneous slip and developed no shear bands even in the (211)[111] crystals. A simple correlation between the shear band formation and dislocation structures was found; the shear bands occurred in the crystals in which aligned micro-bands (layered dislocation walls) evolved.

Influence of precipitates on the microstructure and texture during the rolling of Al-Cu and Al-Mn single crystals with rolling texture orientations

“…The above stability considerations are valid only in the ideal case of homogeneous dislocation slip, and yet in the present Al crystals a dislocation cell structure has been observed, which at higher deformations greater than 63% was transformed into microbands parallel to the slip planes of the two coplanar slip systems (® gures 5 and 8) (Morii et al 1986, Wro bel et al 1994, Ferry and Humphreys 1996. Nonetheless, in the homogeneous G-oriented Al± Cu single crystal, slight TD scatter was observed during cold rolling (® gure 4 (a)), and local orientation measurements likewise yielded small misorientations up to about 108 (® gure 9 (a)).…”