SUPERPLASTICITY RESEARCH OF Ti-23Al-17Nb ALLOY SHEET

doi:10.11900/0412.1961.2014.00055

Acta Metall Sin

2014, Vol. 50

Issue (8): 955-961 DOI: 10.11900/0412.1961.2014.00055

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SUPERPLASTICITY RESEARCH OF Ti-23Al-17Nb ALLOY SHEET

FU Mingjie¹(

), HAN Xiuquan¹, WU Wei¹, ZHANG Jianwei²

1 Metal Forming Technology Department, Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024
2 High Temperature Materials Research Department, Central Iron and Steel Research Institute, Beijing 100081

Cite this article:

FU Mingjie, HAN Xiuquan, WU Wei, ZHANG Jianwei. SUPERPLASTICITY RESEARCH OF Ti-23Al-17Nb ALLOY SHEET. Acta Metall Sin, 2014, 50(8): 955-961.

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Abstract

Superplastic forming is one of effective method to solve the forming difficulty of Ti₃Al based alloy. In this work, the superplasticity of Ti-23Al-17Nb alloy sheet under the conditions of 940~1000 ℃ and 1.7×10^-³~5.5×10^-⁵ s^-¹ are studied. The results show the elongation changes as a parabola with the deformation temperature increasing, and the maximum elongation obtained at 960 ℃ and 5.5×10^-⁵ s^-¹ is 1447.5%. Deformation hardening period increases much more than soften period due to the increasing of element Nb under low strain rate. Compared with primary microstructure, the superplastic deformation could eliminate the texture, the lath-like α₂ grains gradually disappeared, the α₂ grains became more equiaxed, and the content and size of α₂ grains are decreasing with increasing of deformation temperature, the volume fraction of α₂ and B2 phase could reach the optimum deformation at 50∶50. A constitutive relationship based on the Zener-Hollomn parameter and Arrhenius equation was defined for the TAC-1B alloy, and the deformation activation energy Q=390.76 kJ/mol. The results could provide a theory basis for the design and control of TAC-1B alloy superplastic forming process.

Key words: Ti₃Al alloy superplasticity microstructure constitutive equation

Received: 27 January 2014

ZTFLH:

TG146.4

Fund: Supported by Aeronautical Science Foundation of China (No.20121125001)

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	Mingjie FU
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	Wei WU
	Jianwei ZHANG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2014.00055 OR https://www.ams.org.cn/EN/Y2014/V50/I8/955

Fig.1 Schematic of dimensions of superplastic tensile specimen (unit: mm)

Fig.2 Superplastic tensile results of TAC-1B alloy

Fig.3 Stress-strain curves at different temperatures and strain rates of 1.7×10^-³ s^-¹ (a), 3.3×10^-⁴ s^-¹ (b) and 5.5×10^-⁵ s^-¹ (c)

Fig.4 SEM images of primary microstructures along longitudinal (L) (a), transverse (T) (b) and rolling (ST) (c) in TAC-1B alloy

Fig.5 Longitude microstructures at constant strain rate 3.3×10^-⁴ s^-¹ and different temperatures

Fig.6 Transverse microstructures at constant strain rate 3.3×10^-⁴ s^-¹ and different temperatures

Fig.7 Microstructures at 960 ℃ and different strain rates

Fig.8 Curves of ln

ε ˙

~lnσp (a) and ln

ε ˙

~σp (b) of TAC-1B alloy under different deformation parameters

Fig.9 Curves of ln

ε ˙

~ln(sinh(ασ)) (a) and ln(sinh(ασ))~T^-1 (b) of TAC-1B alloy under different deformation parameters

Fig.10 Fittinsg curve between σ_p and Z

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