Precipitate strengthening of pyramidal slip in Mg-Zn alloys

TL;DR

This study investigates how precipitate strengthening influences pyramidal slip in Mg-Zn alloys, revealing that precipitates enable homogeneous deformation and significantly reduce plastic anisotropy, with experimental results aligning with Orowan model predictions.

Contribution

It demonstrates the role of precipitates in promoting pyramidal slip and reducing anisotropy in Mg-Zn alloys, providing insights into strengthening mechanisms.

Findings

Pyramidal slip occurs in precipitation hardened Mg-Zn alloys.

Precipitates enable dislocations to bypass obstacles via Orowan loops.

Precipitate presence reduces plastic anisotropy in magnesium.

Abstract

The mechanical properties of Mg-4wt.% Zn alloy single crystals along the [0001] orientation were measured through micropillar compression at 23C and 100C. Basal slip was dominant in the solution treated alloy, while pyramidal slip occurred in the precipitation hardened alloy. Pyramidal dislocations pass the precipitates by forming Orowan loops, leading to homogeneous deformation and to a strong hardening. The predictions of the yield stress based on the Orowan model were in reasonable agreement with the experimental data. The presence of rod-shape precipitates perpendicular to the basal plane leads to a strong reduction in the plastic anisotropy of Mg.