Formation of the {111}<110> and {111}<112> shear bands and the <111> fiber texture during moderate and heavy wire drawing of 5056 Al-Mg alloy

摘要

Metallography, conventional transmission electron microscopy and X-ray diffraction techniques have been applied to study the defect microstructure of moderately and heavily wire drawn 5056 Al-Mg alloy. Samples drawn moderately (～70% of the original value) has been found to be comprised of columnar grains with no evidence of any recrytallization and contain deformation bands. Deformation bands are made of closely spaced parallel slip bands, which lie on {111} and extends along a <110> and contribute to the development of a moderate <111> fiber texture. These samples also show material decohesion normal to fiber axis. The matrix of the sample drawn heavily (～ 40% of the original value) showed fibrous microstructure with very little evidence of recrystallization, but exhibit a strong <111> texture. Deformation bands in these samples have been found to lie on {111} planes but extend along <112>.