A criterion for slip transfer at grain boundaries in Al

TL;DR

This study investigates the conditions under which slip transfer occurs at grain boundaries in pure Aluminum, proposing a criterion based on residual Burgers vector and Luster-Morris parameter to predict slip transfer likelihood.

Contribution

It introduces a quantitative criterion for slip transfer at grain boundaries in Aluminum, combining residual Burgers vector and Luster-Morris parameter thresholds.

Findings

Slip transfer likely if residual Burgers vector < 0.35b.

Slip transfer likely if Luster-Morris parameter > 0.9.

A combined threshold ratio predicts slip transfer probability.

Abstract

The slip transfer phenomenon was studied at the grain boundaries of pure Aluminum by means of slip trace analysis. Either slip transfer or blocked slip was analyzed in more than 250 grain boundaries and the likelihood of slip transfer between two slip systems across the boundary was assessed. The experimental results indicate that slip transfer was very likely to occur if the residual Burgers vector, $\Delta$b, was below 0.35b and the Luster- Morris parameter was higher than 0.9, and that the ratio of the Luster-Morris parameter and the residual Burgers vector has a threshold above which slip transfer is probable.