NDLI: Hot deformation mechanisms in Ti-5.5Al-1Fe alloy

Content Provider	Springer Nature Link
Author	Balasubrahmanyam, V. V. Prasad, Y. V. R. K.
Copyright Year	2001
Abstract	The mechanisms of hot deformation in the alloy Ti-5.5Al-1Fe have been studied in the temperature range 750 to 1150 °C and with the true strain rate varying from 0.001 to 100 s$^{−1}$ by means of isothermal compression tests. At temperatures below β transus and low strain rates, the alloy exhibited steady-state flow behavior, while, at high strain rates, either continuous flow softening or work hardening followed by flow softening was observed. In the β region, the deformation behavior is characterized by steady-state behavior at low strain rates, yield drops at intermediate strain rates, and oscillations at high strain rates. The processing maps revealed two domains. (1) In the temperature range 750 to 1050 °C and at strain rates lower than 0.01 s$^{−1}$, the material exhibits fine-grained superplasticity. The apparent activation energy for superplastic deformation is estimated to be about 328 kJ/mole. The optimum conditions for superplasticity are 825 °C and 0.001 s$^{−1}$. (2) In the β region, a domain occurs at temperatures above 1100 °C and at strain rates from 0.001 to 0.1 s$^{−1}$ with its peak efficiency of 47% occurring at 1150 °C and 0.01 s$^{1}$. On the basis of kinetic analysis, tensile ductility, and grain size variation, this domain is interpreted to represent dynamic recrystallization (DRX) of β phase. The apparent activation energy for DRX is estimated to be 238 kJ/mole. The grain size (d) is linearly dependent on the Zener-Hollomon parameter (Z) per the equation $$log (d) = 2.86 - 0.023 \log (Z)$$ In the regimes in the temperature range 750 to 825 °C and at strain rates from 0.01 to 1.2 s$^{−1}$ and at temperatures above 1050 °C and strain rates above 10 s$^{−1}$, the material exhibits flow instabilities manifested in the form of adiabatic shear bands.
Starting Page	731
Ending Page	739
Page Count	9
File Format	PDF
ISSN	10599495
Journal	Journal of Materials Engineering and Performance
Volume Number	10
Issue Number	6
e-ISSN	15441024
Language	English
Publisher	Springer-Verlag
Publisher Date	2001-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	deformation mechanisms hot working Ti-5.5Al-1Fe alloy Characterization and Evaluation of Materials Materials Science Tribology, Corrosion and Coatings Quality Control, Reliability, Safety and Risk Engineering Design
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science Mechanical Engineering

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