Thermal Stability of Microstructures in Low-Density Ti2AlNb-Based Alloy Hot Rolled Plate

doi:10.11900/0412.1961.2021.00315

Acta Metall Sin

2023, Vol. 59

Issue (6): 777-786 DOI: 10.11900/0412.1961.2021.00315

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Thermal Stability of Microstructures in Low-Density Ti₂AlNb-Based Alloy Hot Rolled Plate

FENG Aihan¹, CHEN Qiang², WANG Jian³, WANG Hao⁴, QU Shoujiang¹(

), CHEN Daolun⁵(

)

¹School of Materials Science and Engineering, Tongji University, Shanghai 200092, China
²Southwest Technology and Engineering Research Institute, Chongqing 400039, China
³BaoTi Group Co., Ltd., Baoji 721014, China
⁴Interdisciplinary Center for Additive Manufacturing, School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China
⁵Department of Mechanical and Industrial Engineering, Toronto Metropolitan University, Toronto, Ontario M5B 2K3, Canada

Cite this article:

FENG Aihan, CHEN Qiang, WANG Jian, WANG Hao, QU Shoujiang, CHEN Daolun. Thermal Stability of Microstructures in Low-Density Ti₂AlNb-Based Alloy Hot Rolled Plate. Acta Metall Sin, 2023, 59(6): 777-786.

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Abstract

Multielement and multiphase intermetallic alloys based on an ordered orthorhombic (O) phase Ti₂AlNb, where the presence of a long-range order superlattice structure effectively impedes the movement of dislocations and high-temperature diffusion, are a class of highly promising lightweight high-temperature structural materials for aerospace applications due to their high specific strength and superior fracture toughness. Thermal stability of microstructures in the hot rolled sheet of a low-density Ti₂AlNb-based alloy has been investigated in a temperature range from 600^oC to 1100^oC for 12 h via OM, SEM, XRD, and TEM/STEM. The results showed that the initial Ti₂AlNb-based alloy hot rolled sheet consisted of α₂, B2, and O phases. Furthermore, the Ti₂AlNb-based alloy hot rolled sheet at 600^oC for 12 h consisted of α₂, B2, and O phases, where the particle shaped α₂ phase was distributed in the B2 matrix, and lath-like O phase lay inbetween the α₂ particles. The spheroidization of the α₂ phase started to occur along with the coarsening and solutionizing of the lath O phase in the B2 matrix at a temperature between 800^oC and 900^oC for 12 h, while the hot rolled Ti₂AlNb-based alloy plate was still composed of α₂, B2, and O phases. When the temperature reached 950^oC, the O phase disappeared in the B2 matrix. Only α₂ + B2 two phases were present in the hot rolled Ti₂AlNb-based alloy at 950-1000^oC for 12 h, where the α₂ phase was spheroidized and tended to distribute surrounding B2 grain boundaries. When the temperature rose to 1100^oC, the alloy contained a B2 single phase with only some residual α₂ phase. Moreover, the Vickers microhardness contour vs temperature plot revealed that a peak hardness of as high as 509 HV appeared at 600^oC due to the presence of numerous fine O laths.

Key words: Ti₂AlNb-based alloy phase transformation rolling sheet microstructure thermal stability

Received: 30 July 2021

ZTFLH:

TG146.2

Fund: National Key Research and Development Program of China(2018YFB0704100);National Natural Science Foundation of China(51871168);Southwest Technology and Engineering Research Institute Cooperation Fund(HDHDW5902020102)

Corresponding Authors: QU Shoujiang, associate professor, Tel:(021)39947690, E-mail: qushoujiang@tongji.edu.cn
CHEN Daolun, professor, Tel: +416-979-5000 (ext.556487), E-mail: dchen@torontomu.ca

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https://www.ams.org.cn/EN/10.11900/0412.1961.2021.00315 OR https://www.ams.org.cn/EN/Y2023/V59/I6/777

Fig.1 Microstructures and selected area electron diffraction (SAED) patterns of hot rolled Ti₂AlNb-based alloy plate

Fig.2 OM images of hot rolled Ti₂AlNb-based alloy plate after heat treatment at 600^oC (a), 800^oC (b), 900^oC (c), 950^oC (d), 1000^oC (e), and 1100^oC (f) for 12 h and then water quenching

Fig.3 SEM images of hot rolled Ti₂AlNb-based alloy plate after heat treatment at 600^oC (a), 800^oC (b), 900^oC (c), 950^oC (d), 1000^oC (e), and 1100^oC (f) for 12 h and then water quenching

Fig.4 XRD spectra of hot rolled Ti₂AlNb-based alloys plate before (a) and after heat treatment at 600^oC (b), 800^oC (c), 850^oC (d), 900^oC (e), 950^oC (f), 1000^oC (g), 1050^oC (h), and 1100^oC (i) for 12 h and then water quenching (Insets in Figs.4c-e show the magnified spectra)

Fig.5 TEM (a) and STEM (b) images of hot rolled Ti₂AlNb-based alloy plate after heat treatment at 600^oC for 12 h and then water quenching, and corresponding SAED patterns of points I (c) and II (d) in Fig.5a

Phase	Orientation relationship	Ref.
B2/α₂	$[1 1 ¯ 1] B 2 / / [11 2 ¯ 0] a 2, (011) B 2 / / (0001) a 2$	[31]
B2/O	$[1 ¯ 11] B 2 / / [1 1 ¯ 0] O, (110) B 2 / / (001) O$	[30,31]
α₂/O	$[0001] a 2 / / [001] O, (10 1 ¯ 0) a 2 / / (110) O$	[1,3,8]

Table 1 Summaries of orientation relationships among α₂, B2, and O phases^{[1,3,8,30,31]}

Fig.6 TEM (a) and STEM (b) images of hot rolled Ti₂AlNb-based alloy plate after heat treatment at 850^oC for 12 h and then water quenching, and corresponding SAED patterns of points I (c), II (d), III (e), and IV (f) in Fig.6b

Fig.7 TEM image (a) of hot rolled Ti₂AlNb-based alloy plate after heat treatment at 900^oC for 12 h and then water quenching, and corresponding SAED patterns of points I (b), II (c), and III (d) in Fig.7a

Fig.8 TEM (a) and STEM (b) images of hot rolled Ti₂AlNb-based alloy plate after heat treatment at 1000^oC for 12 h and then water quenching, and corresponding SAED patterns of points I (c), II (d), III (e), and IV (f) in Fig.8a

Fig.9 Microhardnesses of hot rolled Ti₂AlNb-based alloy plate as a function of heat treatment temperature

Table 2 Summaries of phase constituents of hot rolled Ti₂AlNb-based alloy plate before and after heat treatment according to XRD, SEM, and TEM analyses

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