Microstructure and Tensile Properties of Ti-43.5Al-4Nb-1Mo-0.1B Alloy Processed by Hot Canned Extrusion

doi:10.11900/0412.1961.2019.00388

Acta Metall Sin

2020, Vol. 56

Issue (7): 979-987 DOI: 10.11900/0412.1961.2019.00388

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Microstructure and Tensile Properties of Ti-43.5Al-4Nb-1Mo-0.1B Alloy Processed by Hot Canned Extrusion

LIU Xianfeng¹^,², LIU Dong¹(

), LIU Renci¹, CUI Yuyou¹, YANG Rui¹

1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. College of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

Cite this article:

LIU Xianfeng, LIU Dong, LIU Renci, CUI Yuyou, YANG Rui. Microstructure and Tensile Properties of Ti-43.5Al-4Nb-1Mo-0.1B Alloy Processed by Hot Canned Extrusion. Acta Metall Sin, 2020, 56(7): 979-987.

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Abstract

β solidifying γ-TiAl alloys are being considered for high-temperature application in the aerospace and automotive industries as high efficiency materials which can withstand temperatures up to 800 ℃ and owns attractively thermal and mechanical properties. Through thermos-mechanical process can obtain excellent alloy properties, such as high strength and better elongation. But it will cause anisotropy. Ti-43.5Al-4Nb-1Mo-0.1B alloy rectangular bar was prepared by isothermal hot canned extrusion process. The OM, SEM, XRD, TEM and tensile methods were used to study the microstructure and tensile properties of the rectangular rods in different states and locations. The results show that the extruded structure of the rectangular rods is relatively uniform and there is no significant difference in the microstructure at different locations. The extrusion deformation makes the orientation of the lamellar uniform, tending to be parallel to the extrusion direction; γ phase in the grain boundary exists in the three forms of graininess, bulk and strip; the β phase is shredded during extrusion and is elongated in a parallel extrusion direction. Under the TEM observation, lamellar at the edge of the bar was completely shredded, and lamellar at the core position was elongated after lamellar was broken. A large number of ω₀ phases are generated in the β₀ phase, and the phase relationship of the two follows: [ $11 1 ˉ$ ] $β 0$ //[0001] $ω 0$ , {110} $β 0$ //{ $2 1 ˉ 1 ˉ 0$ } $ω 0$ . The tensile strength reaches 1000 MPa or more and elongations are about 0.5% of the rectangular bar at room temperature; the yield strength is above 400 MPa at 800 ℃, which exhibits remarkable plasticity. After the ageing treatment of the hot extruded alloy, a large amount of lens-shape γ phase is formed in the β₀ phase, and the ageing treatment improves the high temperature tensile properties of the alloy, but the ω₀ phase can not be eliminated.

Key words: β solidifying γ-TiAl alloy hot canned extrusion deformation microstructure tensile property

Received: 13 November 2019

ZTFLH:

TG146.2

Fund: National Natural Science Foundation of China(51701209)

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	Xianfeng LIU
	Dong LIU
	Renci LIU
	Yuyou CUI
	Rui YANG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2019.00388 OR https://www.ams.org.cn/EN/Y2020/V56/I7/979

Table 1 Chemical compositions of the Ti-43.5Al-4Nb-1Mo-0.1B (TNM) alloy

Fig.1 BSE-SEM image (a) and XRD spectrum (b) of as-cast TNM alloy (Dotted lines in Fig.1a show the larnellar orientations)

Table 2 Microstructural characteristics of TNM alloy in different conditions

Fig.2 BSE-SEM images of microstructure of edge (a, c) and center (b, d) partitions of extrusion (a, b) and ageing (c, d) TNM alloys

Fig.3 Bright field TEM image (a) and SAED pattern (b) of graininess γ phase in grain boundary, and BSE-SEM images of bulk (c) and strip (d) γ phases

Fig.4 Dark field TEM image of ω₀ phase (a) and SAED pattern showing relationships of ω₀and β₀ phases (b)

Fig.5 Low-magnification corrosion-morphology of longitudinal section of extruded TNM alloy

Fig.6 Bright field TEM images of edge (a) and center (b) partitions of extruded TNM alloy

Fig.7 Bright field TEM image (a) and SAED pattern (b) of γ phase precipitated from β₀ phase during ageing treatment

Fig.8 Tensile properties of γ-TiAl alloy (a) and tensile strain-stress curves of samples in different conditions of TNM alloy (b) at room temperature (Extr.—extrusion, HIP—hot isostatic pressing)

Fig.9 Fracture surfaces (a, b), corresponding BSE-SEM images (c, d) and crack nucleation details (e, f) of samples of edge (a, c, e) and center (b, d, f) positions of extrusion-ageing TNM alloy

Fig.10 Tensile properties of γ-TiAl alloy (a) and tensile strain-stress curves of samples in different conditions of TNM alloy (b) at 800 ℃

Fig.11 Fracture morphology in edge partition of ageing-extrusion TNM alloy at 800 ℃

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