Deformation Behavior of Mg-0.4Bi-0.4Sn Alloy under Compression at Room Temperature

Abstract

This study investigates the deformation behavior, texture characteristics, and dislocation structures of an Mg-0.4 Bi-0.4Sn alloy subjected to 3% compression. The electron backscatter diffraction imaging reveals the formation of { (Formula presented.) } twin, in addition to the typical tension, compression, and double twins observed in magnesium alloy. The strain-to-failure of the alloy is found to be an impressive 20.9% which can be due to the spread in texture intensity, activation of various types of twins, and slip systems. When further transmission electron microscopy investigations are carried out to explore the fundamental deformation mechanisms responsible for the plasticity of the alloy, the transmutation of matrix <a> type dislocations into <c + a> type dislocations at the { (Formula presented.) } twin boundary is observed. These <c + a> dislocations formed dipoles by encasing stacking faults present on the basal planes within the { (Formula presented.) } twin domain. Additionally, the cross slip of <a> and <c> type dislocations and the formation of pure edge and screw type <c> dislocations near the grain boundary are observed. Quasi-in situ imaging and slip trace analysis at various strain levels indicate that basal <a> and pyramidal <c + a> slip systems are primarily activated during deformation. © 2025 Wiley-VCH GmbH.