Electric pulse improving the plasticity of the HAl66-6-3-2 alloy by promoting the formation of specific oriented texture

作者：Bobo Lu, Kai Tang, Mingxia Wu, Yi Yang, Gang Yang · 发表于：Materials & Design · 年份：2025 · DOI：10.1016/j.matdes.2025.113836 · 被引用次数：10 · 研究领域：Electromagnetic Effects on Materials、Metal and Thin Film Mechanics、Intermetallics and Advanced Alloy Properties

• Electric pulses sample achieved 69.89 % higher elongation without strength loss. • Electric pulses promote the formation of strong texture parallel to current direction. • Non-thermal effect promotes the evolution of dislocations to form parallel pairs. • Texture changes are attributed to grain boundary migration and grain rotation. Electric pulse treatment (EPT) effectively enhances material plasticity but typically compromises strength, and the combined mechanisms of pulsed current on dislocation evolution and grain rotation remain unclear. Here, HAl66-6–3-2 alloy was subjected to EPT, and the results revealed that the EPT sample achieved an increase in plasticity without compromising the strength, with an elongation rate enhancement of 69.89 %. The changes in performance are mainly attributed to three aspects: grain refinement, slight decrease in dislocation density, and the formation of strong {632}<223> texture during the EPT. Unlike the untreated (UT) samples with entangled dislocations, under the coupling effect of Joule heating and non-thermal effect, the dislocations in EPT samples exhibited directionality, primarily composed of a series of parallel dislocation pairs. The formation of the strong {632}<223> texture primarily relied on grain boundary migration and grain rotation, with both Joule heating and non-thermal effect facilitating rapid grain boundary migration. At low-angle grain boundaries, the pulsed current facilitated grain rotation, transforming low-ang...