Recrystallization Behavior of Ti–6.5Al–3.5Mo–1.5Zr–0.3Si Alloy under Electroshocking Treatment

Abstract

In this work, a novel electroshocking treatment (EST) method was employed to modify the microstructure of Ti‐6.5Al‐3.5Mo‐1.5Zr‐0.3Si alloy. The microstructural morphology and texture distribution after EST were characterized and analyzed to study the recrystallization behavior of the titanium alloy. After EST with 0.04 s, secondary αs phase transformed into β phase. After EST with 0.06 s, surrounding the αp phase, a significant amount of needle‐like martensitic phase (αM) precipitated. Electron backscatter diffraction results revealed that EST reduced intragranular orientation gradients, resulting in a convergence of each point orientations within individual grains. Under longer EST time, grain boundaries displayed greater irregularity. After EST with 0.05 s, partial recrystallization took place, and with an increase of EST time to 0.06 s, all deformed grains underwent complete recrystallization, forming defect‐free recrystallized grains. A substantial enhancement in texture intensity for both α and β phases, exhibiting prominent preferred orientations, and the increase in hardness values was contributed to the precipitation of αM phase. The stress analyses indicated that EST can optimize the distribution of residual stress and offer a potential solution for improving fatigue performance. All results showed that EST was an effective approach for manipulating the microstructure and optimizing the residual stress distribution of titanium alloys.This article is protected by copyright. All rights reserved.