Tensile Behavior and Plastic Deformation Mechanism of Ti-Al-Fe Alloy at Room Temperature and Liquid Nitrogen Temperature

doi:10.11901/1005.3093.2023.230

Chinese Journal of Materials Research

2024, Vol. 38

Issue (3): 232-240 DOI: 10.11901/1005.3093.2023.230

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Tensile Behavior and Plastic Deformation Mechanism of Ti-Al-Fe Alloy at Room Temperature and Liquid Nitrogen Temperature

YIN Yanchao(

), LV Yifan, LIU Qianli, XU Yali, JIANG Peng, YU Wei

Luoyang Ship Material Research Institute, Luoyang 471023, China

Cite this article:

YIN Yanchao, LV Yifan, LIU Qianli, XU Yali, JIANG Peng, YU Wei. Tensile Behavior and Plastic Deformation Mechanism of Ti-Al-Fe Alloy at Room Temperature and Liquid Nitrogen Temperature. Chinese Journal of Materials Research, 2024, 38(3): 232-240.

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Abstract

The tensile properties of Ti-Al-Fe alloy were assessed at 25^oC and -196^oC respectively, aiming to understand the service performance and plastic deformation mechanism of the low-cost Ti-Al-Fe alloy at extreme low temperatures, so that to ensure the service safety of the relevant engineering structures. The microstructure and fracture surface of the alloy were characterized by scanning electron microscope, transmission electron microscope and electron backscatter diffraction technology. The results show that twinning is rarely found in the microstructure of the alloy after plastic deformation at 25^oC, and the plastic deformation mechanism is mainly dislocation slipping. Ti-Al-Fe alloy exhibits better strength and plasticity at 196^oC, with clear twinning induced plastic effect. A large number of twins are produced during plastic deformation, which include{11 $2 -$ 2} compression twins, {10 $1 -$ 2} tensile twins, {11 $2 -$ 4} compression twins. The plastic deformation mechanism may be ascribed to the coexistence of slipping and twinning. At the initial stage of deformation, {11 $2 -$ 2} twins are mainly found, and the number of {10 $1 -$ 2} twins increase at the later stage of deformation.

Key words: metallic materials Ti-Al-Fe alloy tensile property plastic deformation mechanism twinning

Received: 18 April 2023

ZTFLH:

TG146.23

Fund: National Natural Science Foundation of China(51701189)

Corresponding Authors: YIN Yanchao, Tel:(0379)64829315, E-mail: alvinyin@sina.cn

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	YIN Yanchao
	LV Yifan
	LIU Qianli
	XU Yali
	JIANG Peng
	YU Wei

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https://www.cjmr.org/EN/10.11901/1005.3093.2023.230 OR https://www.cjmr.org/EN/Y2024/V38/I3/232

Table 1 Chemical composition of Ti-Al-Fe alloy (mass fraction, %)

Fig.1 Microstructure of Ti-Al-Fe alloy (a) as-received; (b) as-annealed

Table 2 Tensile properties of Ti-Al-Fe alloy as-received and as-annealed

Fig.2 Macro-morphologies of tensile fracture surfaces of as annealed Ti-Al-Fe alloy (a) 25^oC; (b) -196^oC

Fig.3 Micro-morphologies of tensile fracture surfaces of as annealed Ti-Al-Fe alloy (a, c) 25^oC; (b, d) -196^oC

Fig.4 Micrographs of as annealed Ti-Al-Fe alloy after different plastic deformations at -196^oC (a) 7.0%; (b) 11.0%; (c) 14.5%; (d) 19.5%; (e) 22.5%; (f) 34.0%

Fig.5 Morphologies and orientation of twinning (a) A1; (b) B1; (c) C1; (d) D1; (e) A2; (f) B2; (g) C2; (h) D2

Fig.6 Misorientation angle of as annealed Ti-Al-Fe alloy at -196^oC (a) HTA; (b) 7.0%; (c) 11.0%; (d) 14.5%; (e) 19.5%; (f) 34.0%

Fig.7 TEM micrographs of tensile specimen of as annealed Ti-Al-Fe alloy deformed at 25^oC (a) high density dislocation area; (b) dislocation cell; (c) dislocation block at triple junction of grain boundary; (d) dislocation block at the interface of α phase and β phase

Fig.8 TEM micrographs of tensile specimen of as annealed Ti-Al-Fe alloy deformed at -196^oC (a) parallel twin; (b) intersected twin; (c) braided twin; (d) dislocation slipping in the twin; (e) secondary twin; (f) TEM diffraction pattern calibration of the first twin and secondary twin

Fig.9 EBSD experimental results of as annealed Ti-Al-Fe alloy bar (a) (0002), (10 $1 -$ 0) pole figures; (b) inverse pole figures

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