Effect of Heat Treatment on Microstructure and Mechanical Properties of High Nb-TiAl Alloy Sheet

doi:10.11901/1005.3093.2014.553

Chinese Journal of Materials Research

2015, Vol. 29

Issue (9): 649-655 DOI: 10.11901/1005.3093.2014.553

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Effect of Heat Treatment on Microstructure and Mechanical Properties of High Nb-TiAl Alloy Sheet

Zhengzhang SHEN,Yongfeng LIANG,Yanli WANG,Guojian HAO,Laiqi ZHANG,Junpin LIN(

)

State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China

Cite this article:

Zhengzhang SHEN,Yongfeng LIANG,Yanli WANG,Guojian HAO,Laiqi ZHANG,Junpin LIN. Effect of Heat Treatment on Microstructure and Mechanical Properties of High Nb-TiAl Alloy Sheet. Chinese Journal of Materials Research, 2015, 29(9): 649-655.

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Abstract

Effect of heat treatment on the microstructure and mechanical properties of a high Nb-containing TiAl alloy sheet was investigated, which was fabricated by directly hot-rolling a packed alloy ingot. The obtained sheet mainly consisted of remnant coarsening lamella, recrystallized γ grains and strip-like β phase along rolling direction. Followed by variant heat treatments, the coarse lamella and β phase were eliminated, and various typical microstructures were appeared, such as duplex, near fully lamellar and fully lamellar ones. Mechanical properties of the sheet with duplex microstructure were tested at room and high temperatures respectively. The results showed that the strength and ductility of the sheet at room temperature were improved after heat treatment. The brittle-ductile transition temperature was in the range of 850-900℃, and the corresponding fracture mode transformed from transgranular fracture to the nucleation and coalescence of voids.

Key words: metallic materials high Nb-TiAl alloy hot-pack rolling heat treatment duplex microstructure mechanical property

Received: 30 September 2014

Fund: *Supported by National Basic Research Program of China No.2011CB605501.

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	Zhengzhang SHEN
	Yongfeng LIANG
	Yanli WANG
	Guojian HAO
	Laiqi ZHANG
	Junpin LIN

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.553 OR https://www.cjmr.org/EN/Y2015/V29/I9/649

Table 1 Heat treatment processes of high Nb-TiAl alloy sheet

Fig.1 Microstructure of as-cast high Nb-TiAl alloy, (a) low magnification, (b) β phase

Table 2 EDS composition analysis of as-cast high Nb-TiAl alloy (%, atomic fraction)

Fig.2 XRD spectrum of as-cast high Nb-TiAl alloy

Fig.3 Microstructure of sheet after 4-pass hot rolling, (a) low magnification, (b) remnant lamella colony, (c) recrystallized grains, (d) boride

Fig.4 BSE images of high Nb-TiAl alloy sheet after the heat treatment of HT1-1 (a), HT1-2 (b) and HT1-3 (c)

Fig.5 Low (a) and high (b) magnification BSE images of high Nb-TiAl alloy after heat treatment of HT2

Fig.6 BSE images of high Nb-TiAl alloy after the heat treatment of HT3 (a) and HT4 (b)

Fig.7 Tensile engineering stress-strain curves of the as-cast and sheet with DP microstructure at room temperature

Fig.8 The tensile properties of sheet with DP microstructure at elavated temperature

Fig.9 Fracture morphologies of tensile samples in as-cast (a) and DP microstructure (b) at room temperature

Fig.10 Fracture morphologies of sheet with DP microstructure at 850℃ (a) and 900℃ (b)

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