<p>The recrystallization texture at various stages of partial annealing in Ti-15333 alloy samples was investigated in this study using electron backscattered diffraction (EBSD). Severely deformed Ti-15333 samples were subjected to annealing treatment at 780 °C for different durations (15–120 s). This treatment resulted in microstructures containing both deformed and recrystallized grains, characteristic of partial annealing conditions. Nucleation primarily initiated at shear bands (SBs) and deformed grain boundaries (GBs) within the γ-oriented grains. The cold-rolled samples initially exhibited a strong α-fiber and γ-fiber texture. However, partial annealing led to a reduction in the intensity of the α-fiber, while enhancing the γ-fiber and Cube {100}⟨001⟩ components. The orientations of newly nucleated grains (during in-process grain nucleation) were analyzed to investigate the texture transition from the deformed state to the recrystallized condition. Distinct microstructure features associated with in-process grain nucleation, such as bulged GBs, subgrain structure with high orientation gradient, and combined GBs consisting of both HAGBs and LAGBs, were observed within the γ-fiber grains of the partially annealed samples. Grain nucleation occurring at SBs and bulged GBs proceeded via discontinuous static recrystallization (DSRX), whereas grain nucleation within the γ-fiber grains followed a continuous static recrystallization (CSRX) mechanism. During the initial stages of annealing, the I {112}110 and Rotated Cube (RCube, {100}011) components of the α-fiber texture transformed into the {332}⟨<InlineEquation ID="IEq1"> <EquationSource Format="TEX">$\overline{11 }$</EquationSource> <EquationSource Format="MATHML"><math> <mover> <mn>11</mn> <mo>¯</mo> </mover> </math></EquationSource> </InlineEquation> 3 and {221}⟨<InlineEquation ID="IEq2"> <EquationSource Format="TEX">$\overline{11 }$</EquationSource> <EquationSource Format="MATHML"><math> <mover> <mn>11</mn> <mo>¯</mo> </mover> </math></EquationSource> </InlineEquation> 4⟩ components, respectively. Specifically, the {332}⟨<InlineEquation ID="IEq3"> <EquationSource Format="TEX">$\overline{11 }$</EquationSource> <EquationSource Format="MATHML"><math> <mover> <mn>11</mn> <mo>¯</mo> </mover> </math></EquationSource> </InlineEquation> 3⟩ orientation is related to the I component through a 27° rotation about the ⟨110⟩ axis, while the {221}⟨<InlineEquation ID="IEq4"> <EquationSource Format="TEX">$\overline{11 }$</EquationSource> <EquationSource Format="MATHML"><math> <mover> <mn>11</mn> <mo>¯</mo> </mover> </math></EquationSource> </InlineEquation> 4⟩ component is derived from the RCube orientation via a 60° rotation about the ⟨111⟩ axis. With increasing annealing time in the partially annealed samples, overall texture weakening was observed, with the texture maxima distributed around the E, F, and {332}⟨<InlineEquation ID="IEq5"> <EquationSource Format="TEX">$\overline{11 }$</EquationSource> <EquationSource Format="MATHML"><math> <mover> <mn>11</mn> <mo>¯</mo> </mover> </math></EquationSource> </InlineEquation> 3⟩ components.</p> Graphical Abstract <p></p>

Texture Transition Phenomena from Deformed to Recrystallized Conditions in Partially Annealed Metastable β-Ti Alloy

期刊论文
发表日期：

2025年11月7日

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Aman Gupta,
Mattipally Prasad,
Prince Setia,
Nikhil Tripathi,
Shi-Hoon Choi

摘要

The recrystallization texture at various stages of partial annealing in Ti-15333 alloy samples was investigated in this study using electron backscattered diffraction (EBSD). Severely deformed Ti-15333 samples were subjected to annealing treatment at 780 °C for different durations (15–120 s). This treatment resulted in microstructures containing both deformed and recrystallized grains, characteristic of partial annealing conditions. Nucleation primarily initiated at shear bands (SBs) and deformed grain boundaries (GBs) within the γ-oriented grains. The cold-rolled samples initially exhibited a strong α-fiber and γ-fiber texture. However, partial annealing led to a reduction in the intensity of the α-fiber, while enhancing the γ-fiber and Cube {100}⟨001⟩ components. The orientations of newly nucleated grains (during in-process grain nucleation) were analyzed to investigate the texture transition from the deformed state to the recrystallized condition. Distinct microstructure features associated with in-process grain nucleation, such as bulged GBs, subgrain structure with high orientation gradient, and combined GBs consisting of both HAGBs and LAGBs, were observed within the γ-fiber grains of the partially annealed samples. Grain nucleation occurring at SBs and bulged GBs proceeded via discontinuous static recrystallization (DSRX), whereas grain nucleation within the γ-fiber grains followed a continuous static recrystallization (CSRX) mechanism. During the initial stages of annealing, the I {112}110 and Rotated Cube (RCube, {100}011) components of the α-fiber texture transformed into the {332}⟨ $\overline{11 }$ $\bar{11}$ 3 and {221}⟨ $\overline{11 }$ $\bar{11}$ 4⟩ components, respectively. Specifically, the {332}⟨ $\overline{11 }$ $\bar{11}$ 3⟩ orientation is related to the I component through a 27° rotation about the ⟨110⟩ axis, while the {221}⟨ $\overline{11 }$ $\bar{11}$ 4⟩ component is derived from the RCube orientation via a 60° rotation about the ⟨111⟩ axis. With increasing annealing time in the partially annealed samples, overall texture weakening was observed, with the texture maxima distributed around the E, F, and {332}⟨ $\overline{11 }$ $\bar{11}$ 3⟩ components.

Graphical Abstract