Recrystallization behavior of Ti–6.5Al–3.5Mo–1.5Zr–0.3Si alloy under electroshocking treatment

Document Type

Journal Article

Publication Title

Advanced Engineering Materials

Volume

26

Issue

9

Publisher

Wiley

School

Centre for Advanced Materials and Manufacturing / School of Engineering

RAS ID

69786

Funders

Natural Science Foundation of Hubei Province

Grant Number

2022010801010183

Comments

Zhou, J., Sun, H., Wen, Y., Li, J., Wang, L., Zhang, L. C., & Xie, L. (2024). Recrystallization behavior of Ti–6.5 Al–3.5 Mo–1.5 Zr–0.3 Si alloy under electroshocking treatment. Advanced Engineering Materials, 26(9), 2302186. https://doi.org/10.1002/adem.202302186

Abstract

In this work, a novel electroshocking treatment (EST) method is employed to modify the microstructure of Ti–6.5Al–3.5Mo–1.5Zr–0.3Si alloy. The microstructural morphology and texture distribution after EST are characterized and analyzed to study the recrystallization behavior of the titanium alloy. After EST with 0.04 s, secondary αs phase transforms into β phase. After EST with 0.06 s, surrounding the αp phase, a significant amount of needlelike martensitic phase (αM) precipitates. Electron backscatter diffraction results reveal that EST reduces intragranular orientation gradients, resulting in a convergence of each point orientations within individual grains. Under longer EST time, grain boundaries display greater irregularity. After EST with 0.05 s, partial recrystallization takes place, and with an increase of EST time to 0.06 s, all deformed grains undergo 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 is contributed to the precipitation of αM phase. The stress analyses indicate that EST can optimize the distribution of residual stress and offer a potential solution for improving fatigue performance. In all results, it is shown that EST is an effective approach for manipulating the microstructure and optimizing the residual stress distribution of titanium alloys.

DOI

10.1002/adem.202302186

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