Microstructure and Properties of Ti-(43-48)Al-2Cr-2Nb Alloy Prepared by Directional Solidification

doi:10.11901/1005.3093.2020.028

Chinese Journal of Materials Research

2020, Vol. 34

Issue (7): 554-560 DOI: 10.11901/1005.3093.2020.028

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Microstructure and Properties of Ti-(43-48)Al-2Cr-2Nb Alloy Prepared by Directional Solidification

GUO Junjie¹, WANG Guotian²(

), MENG Fanying¹

1.Zhangjiakou Vocational and Technical College, Zhangjiakou 075000, China
2.Heilongjiang Institute of Technology, Harbin 150050, China

Cite this article:

GUO Junjie, WANG Guotian, MENG Fanying. Microstructure and Properties of Ti-(43-48)Al-2Cr-2Nb Alloy Prepared by Directional Solidification. Chinese Journal of Materials Research, 2020, 34(7): 554-560.

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Abstract

The effect of Al content on the microstructure and mechanical properties of directionally solidified Ti-(43-48)Al-2Cr-2Nb alloy prepared by cold crucible was investigated. The results show that the directional solidification structure is mainly composed of α₂-phase and γ-phase. With the increase of Al content, the α₂-phase decreases and the γ-phase content increases, while the direction of microstructural lamellae changed from parallel lamellae and 45° lamellae to vertical lamellae; For the alloy with 48%Al (atomic fraction), the orientation of lamellae is perpendicular to the direction of stress, its compressive strength is high, but plasticity is low; For the alloy with 45%Al (atomic fraction), the orientation of lamellae is parallel to the direction of stress, while maintaining high strength, the room temperature elongation is also high, in other word, the comprehensive properties are good.

Key words: metallic materials TiAl alloy directional solidification microstructure lamellar direction mechanical property

Received: 18 January 2020

ZTFLH:

TG244.3

Fund: National Natural Science Foundation of China(51471062);Doctor Foundation Project of Heilongjiang Institute of Technology(2019BJ03)

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	Junjie GUO
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https://www.cjmr.org/EN/10.11901/1005.3093.2020.028 OR https://www.cjmr.org/EN/Y2020/V34/I7/554

Fig.1 Phase diagram of AMPD-SCN equilibrium transformation^[22]

Fig.2 Binary phase diagram of TiAl alloy at high temperature

Fig.3 XRD pattern of DS Ti-(43-48)Al-2Cr-2Nb alloy

Fig.4 Macro-profile of directional solidification region of CCDS Ti-(43-48)Al-2Cr-2Nb ingots with draw-ing rate of 0.6 mm/min (a) Ti-43Al-2Cr-2Nb; (b) Ti-45Al-2Cr-2Nb; (c) Ti-48Al-2Cr-2Nb

Fig.5 Lognitudinal macrostructures of directionally solidified Ti-45Al-2Cr-2Nb alloys under drawing rate of 0.6 mm/min (a) Ti-43Al-2Cr-2Nb; (b) Ti-45Al-2Cr-2Nb; (c) Ti-48Al-2Cr-2Nb

Fig.6 Interface response function of directional solidification of Ti-48Al-2Cr-2Nb alloy

Fig.7 Effect of different Al content on the orientation of lamellae of alloy with drawing rate of 0.6 mm/min

Fig.8 Back-scattered images of DS TiAl alloys (a) Ti-43Al-2Cr-2Nb; (b) Ti-45Al-2Cr-2Nb; (c) Ti-48Al-2Cr-2Nb

Fig.9 The schematic diagram of compression samples from DS Ti-(43-48)Al-2Cr-2Nb ingots:(a) 45°-0°-45° samples; (b) 0°-45°-90° samples

Fig.10 Stress-strain curves corresponding to the compression tests of Ti-(43-48)Al-2Cr-2Nb alloy with different Al contents

Table 1 Compression properties of DS Ti-(43-48)Al-2Cr-2Nb alloy at drawing rate of 0.6 mm/min

Fig.11 Effect of Al content in Ti-(43-48)Al-2Cr-2Nb alloy on the compressive properties

Fig.12 Fracture surface of DS Ti-45Al-2Cr-2Nb alloy at drawing rate of 0.6 mm/min

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