Effect of 0.2% H on High Temperature Tensile Deformation Behavior of Ti2AlNb Based Alloy Plate

doi:10.11901/1005.3093.2013.975

Chinese Journal of Materials Research

2014, Vol. 28

Issue (4): 248-254 DOI: 10.11901/1005.3093.2013.975

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Effect of 0.2% H on High Temperature Tensile Deformation Behavior of Ti₂AlNb Based Alloy Plate

Yingying ZONG,Daosheng WEN,Bin SHAO,Debin SHAN(

)

National Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001

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Yingying ZONG,Daosheng WEN,Bin SHAO,Debin SHAN. Effect of 0.2% H on High Temperature Tensile Deformation Behavior of Ti₂AlNb Based Alloy Plate. Chinese Journal of Materials Research, 2014, 28(4): 248-254.

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Abstract

In order to understand the effect of thermo hydrogen treatment (THT) on high temperature tensile behavior of a Ti₂AlNb based alloy plate, high temperature tensile tests of Ti-22Al-25Nb alloy plates without and with 0.2%H (mass fraction) charging were conducted with strain rate of 2.5×10^-2 s^-1 at 870, 900, 930 and 990℃respectively. It was found that 0.2%H charging could reduce the high temperature flow stress and enhance the tensile elongation. When deformed at 930℃, the peak stress of the hydrogen charged Ti-22Al-25Nb alloy decreased by approximately 36%, and the elongation increased by approximately 53% in comparison with the bare alloy. Hydrogen-induced softening and plasticity might mainly be attributed to the hydrogen promoted the dynamic recrystallization of α₂ phase, the dislocation movement and the dynamic recovery of b/B2 phase as well as increased the amount of b/B2 phase.

Key words: metallic materials nonferrous metals and alloy Ti₂AlNb based alloy thermo hydrogen technology flow softening dynamic recrystallization dislocation movement

Received: 27 December 2013

Fund: *Supported by National Natural Science Foundation of China No.51275132, the State Key Laboratory of Materials Processing and Die &Mould Technology, Huazhong University of Science and Technology No.2011-P11, and Harbin Science and Technology Department No.2008RFQXG046.

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	Yingying ZONG
	Daosheng WEN
	Bin SHAO
	Debin SHAN

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https://www.cjmr.org/EN/10.11901/1005.3093.2013.975 OR https://www.cjmr.org/EN/Y2014/V28/I4/248

Fig.1 XRD spectra of unhydrogenated (a) and hydrogenated (b)Ti-22Al-25Nb alloys

Fig.2 Microstructures of unhydrogenated (a, c) and hydrogenated (b, d) Ti-22Al-25Nb alloys before tensile test

Table 1 Element contents of I、II、III regions in Fig.2a (atomic fraction, %)

Fig.3 True stress-strain curves (a), peak stresses (b) and elongations (c) of unhydrogenated and hydrogenated Ti-22Al-25Nb alloys deformed at high temperature

Fig.4 Microstructure of hydrogenatedTi-22Al-25Nb alloy deformed at 870℃ and strain rate of 2.5×10^-2 s^-1

Fig.5 Microstructures of unhydrogenated (a, b) and hydrogenated (c, d) Ti-22Al-25Nb alloys deformed at 930℃ and strain rate of 2.5×10^-2 s^-1

Fig.6 Microstructures of unhydrogenated (a, c, e) and hydrogenated (b, d, f) Ti-22Al-25Nb alloys deformed at 990℃and strain rate of 2.5×10^-2 s^-1

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