In-situ study the distinct recrystallization pathways induced by boron and yttrium in Ti-6Al-4V

• Published in: Journal of alloys and compounds Vol. 1039; p. 183130
• Main Authors: Han, Ying, Cheng, Lei, Zhao, Shengxuan, Zhang, Yu, Cheng, Zhicheng, Yu, Wei
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 10.09.2025
• Subjects: Boron; In-situ electron backscatter diffraction; Recrystallization texture; Static recrystallization; Yttrium; Boron; In-situ electron backscatter diffraction; Recrystallization texture; Yttrium; Static recrystallization
• ISSN: 0925-8388
• DOI: 10.1016/j.jallcom.2025.183130

In this study, in-situ high-temperature EBSD annealing experiments, complemented by TEM characterization, were employed to comparatively investigate the effects of boron (B) and yttrium (Y) additions on the nucleation, grain growth, and texture evolution during static recrystallization (SRX) in the Ti-6Al-4V alloy. Results indicate that both boron and yttrium additions facilitate SRX, with boron element exhibiting a notably stronger effect by significantly reducing the critical strain energy required for recrystallization activation. Recrystallization texture analysis indicates that TiB particles weaken the preferential growth along the //ND, thereby promoting texture randomization. In contrast, Y2O3 particles enhance multi-site nucleation, leading to competitive growth between the <10–10>//RD and //ND orientations. Distinct nucleation mechanisms were identified in the Ti-6Al-4V, Ti-6Al-4V-B, and Ti-6Al-4V-Y alloys. Specifically, the Ti-6Al-4V-Y alloy exhibited grain boundary bulging nucleation (GBBN) and particle-stimulated nucleation (PSN), while the Ti-6Al-4V-B alloy showed a synergistic activation of multiple mechanisms, including PSN, subgrain coalescence nucleation (SCN), subgrain boundary migration nucleation (SBMN), and GBBN, ultimately leading to a more uniform recrystallized microstructure. The second-phase particles regulate orientation evolution through distinct recrystallization pathways, highlighting the fundamental differences in mechanism-based control induced by boron and yttrium additions. •Boron lowers SRX activation threshold, yielding stronger recrystallization effects.•TiB particles weaken //ND growth, driving texture randomization.•Y2O3 particles promote multi-site nucleation, generating competing texture components.•Ti-6Al-4V-B shows synergistic PSN, SCN, SBMN, and GBBN, uniform SRX microstructure.