Recrystalliation textures of polycrystalline aluminum having orientations three-dimensionally controlled

Textures of rolled sheets of growth twinned aluminum (2nd report)

Abstract

The orientation of polycrystalline aluminum can be three-dimensionally controlled by "regrowing" lamellar growth twin crystals ²⁾. It was demonstrated in the preceding papery ¹⁾ that the rolled textures depend upon the initial orientations by using aluminum cast blocks which have been three-dimensionally orientated in such a way. The recrystallization textures of aluminum sheets were determined, in this work, study, in order to accomplish the transitions from rolled to recrystallized and from initial to recrystallized textures.
The transformation of rolled to recrystallized textures are:
Rolled texture recrystallized texture
{110} <112> →{110} <112> +ω{110} <001> at 350°C
"→{110} <001> +{123} <331> at 500°C
{112} <111> →{001} <410> +n{123} <334>
n{225} <335> →{112} <123> +{100} <001>
{157} <335> →{135} <112> +ω{110} <001> +n{133} <321>
n{113} <553> +{110} <225> →n{113} <553> +{110} <225> at 350°C
"→n{113} <335> {110} <115> at 500°C
Three types of dependence of recrystallized textures on rolled ones are found:
(1) Both of the textures are the same or similar.
(2) The both have a conjugate <111> axis of rotation.
(3) The both are independent.
The recrystallized textures incidentally depend upon the initial textures. Each of the oriented growth and oriented nucleation, theories is incomplete for the explanation of recrystallizing behavior. The nucleating and growing stages for recrystallization would be noteworthy.