Nucleation at Cube Bands during Recrystallisation in Commercial Al Alloy

Abstract

In the present study, nucleation at Cube bands during annealing of a cold rolled commercial aluminium alloy AA8079 was investigated. The main goal of this work was to provide experimental data for subsequent modelling. By studying the deformed material the geometrical parameters of Cube bands were determined. The Cube band spacing in the deformed state was measured experimentally and accordingly calculated with a simple geometric model, taking the initial Cube fraction in the pre-deformed state and the deformation degree into account. The nucleation frequency during subsequent annealing of the cold deformed material was estimated from the geometry and size of deformed Cube bands prior to deformation. From investigations of the orientation relationship between the Cube oriented nuclei and the adjacent deformed matrix with S orientation, the fraction of 40°<111> grain boundaries having optimum growth conditions, was established.

A Study of Cube Grain Nucleation in a Commercial Al Alloy during <i>In Situ</i> and Discontinuous (<i>Ex Situ)</i> Annealing Experiments

“…The formation of crystallographic textures is very much of concern due to the strong influence of texture on material anisotropy. In Al alloys frequently a strong Cube texture develops during recrystallization which is commonly attributed to the existence of Cube bands which survive the rolling process [1][2][3][4][5][6][7][8]. Although in texture simulations the occurrence of a Cube texture is usually correctly predicted, the computed intensities of the Cube component are often at variance with experimental results.…”

Modeling Recrystallization in Al Alloys: Investigation of Nucleation at Cube Bands

“…To provide input to such a model, Cube bands have to be experimentally characterized as potential nucleation sites. In our previous work [5], statistical distributions of Cube band size and distance between them have been investigated by experimental observations using EBSD analysis. The aim of the present work is to determine the average nucleus density at Cube bands as important characteristic for subsequent modeling.…”