Texture of Ti2AlNb Sheet and Its Effect on Anisotropy of Tensile Properties

doi:10.11900/0412.1961.2024.00074

Acta Metall Sin

2025, Vol. 61

Issue (11): 1625-1637 DOI: 10.11900/0412.1961.2024.00074

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Texture of Ti₂AlNb Sheet and Its Effect on Anisotropy of Tensile Properties

WANG Ziyu¹^,², CHEN Zhiyong¹^,²(

), WANG Xin³, WANG Qingjiang¹^,²(

)

1 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
2 Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3 Baoji Titanium Industry Co. Ltd., Baoji 721000, China

Cite this article:

WANG Ziyu, CHEN Zhiyong, WANG Xin, WANG Qingjiang. Texture of Ti₂AlNb Sheet and Its Effect on Anisotropy of Tensile Properties. Acta Metall Sin, 2025, 61(11): 1625-1637.

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Abstract

Ti₂AlNb alloys are a type of lightweight material that has excellent high-temperature performance exceeding that of titanium alloys. Manufacturers often use rolling as a major method to obtain a Ti₂AlNb sheet. After rolling, the mechanical properties of the resulting Ti₂AlNb sheets exhibit evident anisotropy, but the anisotropic mechanism remains unclear. In view of the anisotropic tensile properties of Ti₂AlNb sheets, this study investigates the microstructure, texture, and tensile properties of Ti₂AlNb sheets, as well as to explore the main factors affecting the anisotropy of sheet tensile properties. Results indicate that the microstructure of Ti₂AlNb alloy sheets consists of α₂, B2, and O phases, with each phase exhibiting a strong texture. The B2 phase forms a slightly rotated cubic texture, whereas the O phase develops a distinct <100>//ND (normal direction) phase transformation texture, which is related to the orientation of the α₂ and B2 phases. The α₂ phase exhibits a strong rolling thermal deformation-induced {11 $2 ¯$ 0}<uvtw> texture. The tensile properties of the sheets at room temperature (24 ^oC) and 650 ^oC exhibit remarkable anisotropy, with the transverse tensile strength being higher than the longitudinal strength. However, the longitudinal elongation is higher than the transverse elongation. This result is attributed to the near-T-type strong texture of the α₂ phase and <100>//ND phase transformation texture of the O phase, which make the respective prismatic <a> slip more difficult to activate in the transverse direction of the sheets. As the tensile testing temperature increases to 700 ^oC, the activation of pyramidal <c + a> slip in the α₂ and O phases markedly reduces the anisotropy of the tensile properties.

Key words: Ti₂AlNb alloy sheet microstructure texture tensile property anisotropy

Received: 08 March 2024

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	WANG Ziyu
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https://www.ams.org.cn/EN/10.11900/0412.1961.2024.00074 OR https://www.ams.org.cn/EN/Y2025/V61/I11/1625

Fig.1 Schematic of cyclic heat treatment (AC—air cooling, FC—furnace cooling)

Fig.2 Dimension (unit: mm) (a) and schematic (b) of tensile specimen (ND—normal direction, RD—rolling direction, TD—tranverse direction)

Fig.3 XRD spectrum of the as-received Ti₂AlNb sheet

Fig.4 OM (a) and SEM (b) images of RD-ND plane of Ti₂AlNb sheet

Fig.5 OM (a) and SEM (b) images of TD-ND plane of Ti₂AlNb sheet

Fig.6 Texture of B2 phase in Ti₂AlNb sheet (Color bar: pole density, the same below)
(a) pole figures (b) inverse pole figure (IPF) coloring map (c) IPFs

Fig.7 Texture of α₂ phase in Ti₂AlNb sheet
(a) pole figures (b) IPF coloring map (c) IPFs

Fig.8 Texture of O phase in Ti₂AlNb sheet
(a) pole figures (b) IPF coloring map (c) IPFs

Table 1 Tensile properties of Ti₂AlNb sheet at room temperature and high temperatures

Fig.9 Engineering stress-strain (σ-ε) curves of longitudinal and transverse specimens tensiled at 650 ^oC

Fig.10 Schmidt factor (SF) distributions of slips in B2 phase load along the RD and TD
(a) {110}<111> (b) {112}<111>

Fig.11 SF distributions of slips in α₂ phase load along the RD and TD
(a) basal <a> slip
(b) prismatic <a> slip
(c) pyramidal <c + a> slip

Fig.12 SF distributions of basal <a> slip in O_{phase load along the RD and TD}
(a) {001}<110> (b) {001}<100>

Fig.13 SF distributions of prismatic <a> slip in O phase load along the RD and TD
(a) {010}<100> (b) {110}<1

1 ¯

Fig.14 SF distributions of prismatic <a> slip in O phase load along the RD and TD
(a) {131}<11

4 ¯

> (b) {201}<10

2 ¯

> (c) {221}<10

2 ¯

> (d) {221}<11

4 ¯

Fig.15 Distributions of SFs of α₂ phase prismatic <a> slip system on {0001} pole figure
(a) load along RD direction (b) load along TD direction

Fig.16 Distributions of α₂ phases with different texture types (Insets show the 3D orientations at positions A, B, and C of α₂ phases)
(a) near T-type texture (b) near R-type texture

Fig.17 SF distributions of α₂ phase prismatic <a> slip system with different types of textures load along RD and TD
(a) near T-type texture
(b) near R-type texture

Fig.18 XRD spectrum of the unrolled Ti₂AlNb alloy slab

Fig.19 Pole figures of phases in unrolled alloy after heat cycle treatment
(a) B2 phase (b) α₂ phase (c) O phase

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