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<p>The microstructural evolution and deformation-induced anisotropy of hot-rolled Ti–6Al–2Sn–4Zr–6Mo alloy plates were systematically investigated under disparate strain paths, namely unidirectional rolling (UDR), cross-directional rolling (CDR), and multi-step cross-rolling (MSCR). UDR produced pronounced morphological anisotropy and a strong primary (0001) α-texture component with a local maximum pole density of 62.73, whereas MSCR promoted extensive α-lath globularization and weakened texture, reducing the local maximum pole density of this component to 26.69. Crystallographic interrogation elucidates a fundamental shift in the restoration kinetics: the CDR path operates via a synergistic interplay between discontinuous and continuous dynamic recrystallization (DDRX and CDRX); in contrast, the MSCR route is primarily driven by an extensive CDRX process, which results in a remarkably elevated high-angle grain boundary (HAGB) fraction reaching 78.8% and 81.8% within the RD and TD planes, respectively. Kernel average misorientation (KAM) analysis reveals a morphological transition of localized strain clusters from continuous shear bands into discrete, point-like distributions, signifying the efficient dissipation of stored deformation energy. This behavior may be associated with the periodic alteration of the loading axes, which changes the geometrical favorability of different slip systems and may promote a more balanced contribution of basal, prismatic, and pyramidal slip systems. The ensuing randomized texture reconstruction acts as the intrinsic kinetic driver for the superior microstructural homogeneity achieved in this alloy.</p>

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Microstructural evolution and deformation-induced anisotropy in hot-rolled Ti–6Al–2Sn–4Zr–6Mo alloy

  • 期刊论文

  • 发表日期：

    2026年8月4日

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  • Jiayu Xue,
  • Zhuangyan Zheng,
  • Boshen Zhao,
  • Feng Li,
  • Cancan Liu,
  • Liang Feng,
  • Hui Chang

摘要

The microstructural evolution and deformation-induced anisotropy of hot-rolled Ti–6Al–2Sn–4Zr–6Mo alloy plates were systematically investigated under disparate strain paths, namely unidirectional rolling (UDR), cross-directional rolling (CDR), and multi-step cross-rolling (MSCR). UDR produced pronounced morphological anisotropy and a strong primary (0001) α-texture component with a local maximum pole density of 62.73, whereas MSCR promoted extensive α-lath globularization and weakened texture, reducing the local maximum pole density of this component to 26.69. Crystallographic interrogation elucidates a fundamental shift in the restoration kinetics: the CDR path operates via a synergistic interplay between discontinuous and continuous dynamic recrystallization (DDRX and CDRX); in contrast, the MSCR route is primarily driven by an extensive CDRX process, which results in a remarkably elevated high-angle grain boundary (HAGB) fraction reaching 78.8% and 81.8% within the RD and TD planes, respectively. Kernel average misorientation (KAM) analysis reveals a morphological transition of localized strain clusters from continuous shear bands into discrete, point-like distributions, signifying the efficient dissipation of stored deformation energy. This behavior may be associated with the periodic alteration of the loading axes, which changes the geometrical favorability of different slip systems and may promote a more balanced contribution of basal, prismatic, and pyramidal slip systems. The ensuing randomized texture reconstruction acts as the intrinsic kinetic driver for the superior microstructural homogeneity achieved in this alloy.