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Hydrogenation behavior of Ti–44Al–6Nb alloy and its effect on the microstructure and hot deformability

Published online by Cambridge University Press:  17 January 2017

Tengfei Ma ,
Ruirun Chen ,
Deshuang Zheng ,
Chang Liu ,
Jingjie Guo ,
Hongsheng Ding ,
Yanqing Su  and
Hengzhi Fu
Tengfei Ma
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin150001, China
Ruirun Chen*
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin150001, China
Deshuang Zheng
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin150001, China
Chang Liu
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin150001, China
Jingjie Guo
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin150001, China
Hongsheng Ding
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin150001, China
Yanqing Su
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin150001, China
Hengzhi Fu
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin150001, China
*
a)Address all correspondence to this author. e-mail: ruirunchen@hit.edu.cn
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Abstract

The hydrogenation behavior of Ti–44Al–6Nb (at.%) alloy was studied at temperature range of 1373–1693 K, and the effect of hydrogen on hot deformability was tested on Gleeble-1500D thermo-simulation machine. It is found that the lnCH increases linearly with 1/T, and hydrogen content increases with increasing of hydrogen time and flow rate logarithmically. The positive heat of solution of hydrogen denotes that hydrogen absorption in TiAl alloys is an endothermic reaction. The results also show that hydrogen promotes the lamellar colony size and lamellar spacing because that hydrogen can promote the diffusion of elements. There is more residual B2 phase in the hydrogenated alloy revealing that hydrogen stabilizes the B2 phase during hydrogenation. The nanohardness and elastic modulus of the alloy are decreased from 4.4 and 213.5 GPa to 4.2 and 199.8 GPa after hydrogenation with 0.033 wt% H. Thermal simulation results show that the peak stress is decreased by 30% after hydrogenation with 0.033 wt% H which corresponds to decreasing the deformation temperature by about 50 K. This is attributed to hydrogen-promoted dynamic recrystallization and dislocation movement.

Keywords

hydrogenationmicrostructurestress/strain relationship
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 7 , 14 April 2017 , pp. 1304 - 1315
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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