电子束选区熔化成形Ti<sub>2</sub>AlNb合金微观组织与性能

doi:10.11868/j.issn.1001-4381.2021.000958

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Abstract

Ti₂AlNb based alloys is considered to be the most potential material material to replace the traditional Ni-based superalloys, because of its excellent high-temperature specific strength, creep resistance and high fracture toughness. Ti-22Al-25Nb alloy was fabricated by selective electron beam melting(SEBM), and the density of as-built samples reached 5.42-5.43 g/cm³through process optimization. The microstructure, phase evolution and mechanical property of the as-built and HIPed Ti₂AlNb alloy samples were investigated. The results show that the microstructure of the as-built and HIPed samples both show the columnar crystalline structures along the deposition direction, which are all composed of B2, O and α₂ phases, and the amount of O/α₂ phase gradually increases from top to bottom. After HIP, the width and amount of the O/α₂ phase are reduced and relatively uniform when compared with that of the as-built samples. In the bottom area, the microhardness of the as-built sample exhibits higher value of about (345.87±5.09)HV, while the hardness increases to 388.91-390.48HV after HIP. The ultimate tensile strength and elongation of the as-built sample at room temperature are (1061±23.71) MPa and (3.67±1.15)% respectively, and the ultimate tensile strength increases to (1101±23.07) MPa and the elongation reduces to 3.5% after HIP.

Key words： Ti₂AlNb based alloy selective electron beam melting density microstructure mechanical property

Received: 28 September 2021 Published: 18 July 2022

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TG113

Corresponding Authors: Weiwei HE E-mail: hewi126@126.com

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	Articles by authors
	Qianying CHE
	Weiwei HE
	Huixia LI
	Kangkang CHENG
	Yu WANG

Cite this article:

Qianying CHE,Weiwei HE,Huixia LI, et al. Microstructure and property of Ti₂AlNb alloy by selective electron beam melting[J]. Journal of Materials Engineering, 2022, 50(7): 156-164.

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http://jme.biam.ac.cn/EN/10.11868/j.issn.1001-4381.2021.000958 OR http://jme.biam.ac.cn/EN/Y2022/V50/I7/156

Chemical compositions of the Ti-22Al-25Nb powder and as-built rods

Morphology of Ti-22Al-25Nb powder

Photograph of the Ti₂AlNb samples by SEBM (a), schematic diagram of microscopic tissue sampling at different heights (b) and tensile samples (c)

Processing window for fabricating Ti₂AlNb alloy by SEBM

Effect of line energy density on the relative density of the samples

Microstructures of as-built (1) and HIP (2) Ti₂AlNb alloy at different heights
(a)sample 1;(b)sample 2;(c)sample 3;(d)sample 4;(e)sample 5

SEM images of as-built (a) and HIP (b) Ti₂AlNb alloy

XRD patterns of as-built (a) and HIP (b) samples at different heights

Microhardness of as-built and HIP samples at different heights

Tensile properties of the Ti₂AlNb alloys at room temperature

SEM morphologies of fracture surface
(a)as-built; (b)HIP

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