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Microstructures and mechanical properties of Ti–44Al–5Nb–3Cr–1.5Zr–xMo–yB alloys

Published online by Cambridge University Press:  15 July 2020

Zhiping Li Open the ORCID record for Zhiping Li [Opens in a new window] ,
Donghui Zhang ,
Liangshun Luo ,
Binbin Wang ,
Liang Wang ,
Yanqing Su ,
Jingjie Guo  and
Hengzhi Fu
Zhiping Li
Affiliation:
National Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin150001, People's Republic of China
Donghui Zhang
Affiliation:
National Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin150001, People's Republic of China
Liangshun Luo*
Affiliation:
National Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin150001, People's Republic of China
Binbin Wang
Affiliation:
National Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin150001, People's Republic of China
Liang Wang
Affiliation:
National Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin150001, People's Republic of China
Yanqing Su
Affiliation:
National Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin150001, People's Republic of China
Jingjie Guo
Affiliation:
National Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin150001, People's Republic of China
Hengzhi Fu
Affiliation:
National Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin150001, People's Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

TiAl alloys are potential structural high-temperature structural materials at a service temperature of ~900 °C, while poor ductility at room temperature and high creep rate at the elevated temperature limits the applications. To improve the room-temperature and high-temperature mechanical properties of Ti–44Al–5Nb–3Cr–1.5Zr, Mo and B were introduced into this system and Ti–44Al–5Nb–3Cr–1.5Zr–xMo–yB alloys were proposed. And then, we, respectively, studied the microstructures and mechanical properties of Ti–44Al–5Nb–3Cr–1.5Zr–xMo–0B and Ti–44Al–5Nb–3Cr–1.5Zr–1Mo–yB to elucidate the role for the addition of Mo and B. It is found that Mo can increase the fraction of B2 phase in the alloys and the microstructures of the alloys are greatly refined by the addition of B. The compression test results indicate that Mo has a positive influence on the high-temperature compressive properties of TiAl-based alloys, whereas B addition can improve their room-temperature compressive properties of Ti–44Al–5Nb–3Cr–1.5Zr–1Mo–yB alloys; the morphology of borides in each sample should be the structural origin for these phenomena.

Keywords

TiAl alloysmicrostructuremechanical propertiesboronmolybdenum
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 20 , 28 October 2020 , pp. 2756 - 2764
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Copyright
Copyright © Materials Research Society 2020

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