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

Author:

Zhou Jian12,Sun Hongxin12,Wen Yan12,Li Jiashun12,Wang Liqiang3,Zhang Lai‐Chang4,Xie Lechun12ORCID

Affiliation:

1. Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan 430070 P.R. China

2. Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan 430070 P.R. China

3. State Key Laboratory of Metal Matrix Composites School of Materials Science and Engineering Shanghai Jiao Tong University No. 800 Dongchuan Road Shanghai 200240 P.R. China

4. Centre for Advanced Materials and Manufacturing School of Engineering Edith Cowan University 270 Joondalup Drive, Joondalup Perth WA 6027 Australia

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.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Hubei Province

Publisher

Wiley

Reference59 articles.

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