On the correlation of shear band formation and texture evolution in $\alpha$-brass during accumulative roll bonding

TL;DR

This study investigates the microstructural evolution of $eta$-brass during accumulative roll bonding, revealing that brass-type texture can develop prior to shear band formation, challenging previous assumptions about their causal relationship.

Contribution

It demonstrates that shear banding and brass texture development are only correlated and can occur in different sequences depending on processing conditions.

Findings

Brass-type texture appears before shear band formation in ARB.

Shear banding and texture development are only correlated, not causally linked.

Order of phenomena depends on experimental parameters.

Abstract

We studied the microstructural evolution of the low stacking fault energy $\alpha$-brass alloy CuZn15 during accumulative roll bonding (ARB). Most notably, the typical brass-type texture was clearly observed after four ARB passes (approx. 93.8 % total thickness reduction), before significant shear localization set in. This observation contradicts the widely accepted idea that shear band formation is a necessary prerequisite for the development of the brass type texture, indicating that the two phenomena, shear banding and development of the brass texture, are only correlated in ARB, and that their order of appearance can be switched depending on experimental parameters.