Interplay between deformation twins and basal stacking faults enriched with Zn/Y in Mg₉₇Zn₁Y₂ alloy

Abstract

Basal stacking faults (SFs) enriched with Zn/Y are identified in an Mg₉₇Zn₁Y₂ alloy, and the interaction between SFs and {} deformation twins (DTs) is characterized at the atomic scale by means of high-resolution transmission electron microscopy. Such an interaction results in deviations of twin angle from its theoretical value and twin boundary (TB) from its () habit plane. In addition, the DT-SF reaction not only leads to the TB with terraces along basal planes, but also makes the TB broaden with severe distortion. The role of long-period stacking ordered lamellae in propagation of DTs is also clarified based on the atomic-scale high-resolution images.

Keywords:

• deformation twin
• stacking fault
• habit plane
• Mg alloy
• HAADF-STEM