Present Status for Rolling TiAl Alloy Sheet

doi:10.11900/0412.1961.2021.00438

Acta Metall Sin

2022, Vol. 58

Issue (8): 965-978 DOI: 10.11900/0412.1961.2021.00438

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Present Status for Rolling TiAl Alloy Sheet

CHEN Yuyong¹^,²(

), YE Yuan¹, SUN Jianfei¹

^1.School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
^2.International Institute of Vanadium and Titanium, Panzhihua University, Panzhihua 617000, China

Cite this article:

CHEN Yuyong, YE Yuan, SUN Jianfei. Present Status for Rolling TiAl Alloy Sheet. Acta Metall Sin, 2022, 58(8): 965-978.

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Abstract

TiAl alloy sheets are important strategic structural materials in aerospace and automotive industry because of their high strength-to-weight ratio and high service temperature. However, the preparation of TiAl alloy sheets is difficult, especially the rolling of large-size high-performance TiAl alloy sheets. The preparation process, size, microstructure, and mechanical properties of hot-rolling TiAl alloy sheets using ingot metallurgy, powder metallurgy, direct rolling, and roll bonding approaches in recent years were reviewed. The features and existing problems of the above processing routes were discussed. Meanwhile, some suggestions on rolling large-size TiAl alloy sheets and its future development were proposed.

Key words: TiAl alloy sheet rolling process mechanical property sheet size

Received: 15 October 2021

ZTFLH:

TG146.2

Fund: National Nature Science Foundation of China(51434007);National Nature Science Foundation of China(51371064)

About author: CHEN Yuyong, professor, Tel: (0451)86418802, E-mail: yychen@hit.edu.cn

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	Yuyong CHEN
	Yuan YE
	Jianfei SUN

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https://www.ams.org.cn/EN/10.11900/0412.1961.2021.00438 OR https://www.ams.org.cn/EN/Y2022/V58/I8/965

Fig.1 An all TiAl honeycomb core and sandwich panel^[3]

Fig.2 Schematics of ingot metallurgy (IM) rolling route (a-i)

Fig.3 Phase distribution within TiAl sheet after processing under quasi-isothermal rolling conditions and non-isothermal rolling conditions^[18]

Fig.4 Appearances of IM rolling TiAl alloy sheets
(a) Ti-44Al-8Nb-0.2W-0.2B-Y alloy^[19] (b) Ti-44Al-5V-1Cr alloy^[21]
(c) Ti-43Al-9V-0.2Y alloy^[22] (d) Ti-45Al-8.5Nb-(W, B, Y)^[24]

Fig.5 Microstructures of Ti-44Al-8Nb-0.2W-0.2B-Y alloy sheet (a-c)^[19] and Ti-45Al-8.5Nb-(W, B, Y) alloy sheet (d, e)^[24] (RD—rolling direction)
(a) low magnification (b) residual lamellar region (c) duplex microstructure region
(d) normal direction section (e) RD section

Fig.6 Microstructure of Ti-44Al-5V-1Cr alloy sheet^[21]

Fig.7 Microstructures of Ti-43Al-9V-0.2Y alloy sheet^[23] (TD—transverse direction)
(a) low magnification (b) irregular lamellar structures (c) regular lamellar structures

Fig.8 Schematics of powder metallurgy (PM) rolling route (a-i)

Fig.9 γ-TiAl alloy sheet of PM rolling^[27]
(a) microstructure (b) appearance

Fig.10 Microstructure of Ti-45Al-7Nb-0.3W alloy sheet (reduction 73%)^[28]

Fig.11 Microstructure of Ti-45Al-7Nb-0.3W alloy sheet (reduction 50%)^[29]

Fig.12 Appearance of direct-rolling TiAl alloy sheets
(a) Ti-45Al-8.5Nb-(Nb, W, B) alloy^[33]
(b) Ti-44.45Al-3.80Nb-1.01Mo-0.29Si-0.14B alloy^[34]
(c) Ti-45Al-8.5Nb-0.2W-0.2B-0.2Y alloy^[35]
(d) Ti-44Al-5Nb-1Mo-2V-0.2B alloy^[36]

Fig.13 Appearance of direct-rolling billet^[35]
(a) Ti-45Al-8.5Nb-0.2W-0.2B-0.2Y alloy billet (b) billet + soft can

Fig.14 Microstructures of Ti-44Al-5Nb-1Mo-2V-0.2B alloy sheet with different magnifications (a, b)^[36]

Table 1 Nominal composition, rolling method, dimension, and mechanical properties of TiAl alloy sheet in China^{[19,21,23,24,27,29,30,33-36]}

Fig.15 Schematics of roll bonding route (a-e)

Fig.16 Appearance of Ti-43Al-9V-0.3Y/Ti-6Al-4V composite sheet^[40]

Fig.17 Microstructures of Ti-6Al-4V/high Nb-TiAl laminate composite material^[43]
(a) low magnification (b) low magnification micrograph of interface region
(c) high magnification micrograph of interfacial region
(d) schematic of phase distribution in interfacial region

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