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S. S. Bkhattacharya, O. I. Bylya, R. A. Vasin, and K. A. Padmanabhan, "Mechanical Behavior of Titanium Alloy Ti-6Al-4V with Unprepared Microstructure under Jumpwise Variations of the Strain Rate in the Superplastic State," Mech. Solids. 44 (6), 951-958 (2009)
Year 2009 Volume 44 Number 6 Pages 951-958
DOI 10.3103/S0025654409060120
Title Mechanical Behavior of Titanium Alloy Ti-6Al-4V with Unprepared Microstructure under Jumpwise Variations of the Strain Rate in the Superplastic State
Author(s) S. S. Bkhattacharya (Indian Institute of Technology Madras, Chennai, 600036 India, ssb@iitm.ac.in)
O. I. Bylya (Institute of Mechanics, Lomonosov Moscow State University, Michurinskii pr-t 1, Moscow, 119192 Russia, olga.bylya@mail.ru)
R. A. Vasin (Institute of Mechanics, Lomonosov Moscow State University, Michurinskii pr-t 1, Moscow, 119192 Russia, prof.vasin@mail.ru)
K. A. Padmanabhan (Anna University Chennai, Chennai, 600025 India, ananthaster@gmail.com)
Abstract We present the results of extension tests with superplastic specimens made of structural titanium alloy with unprepared (coarse-grained) microstructure. The tests were performed at a constant temperature and constant or piecewise constant strain rate. It was shown that, in the case of a jumpwise decrease in the strain rate, the typical shape of the strain diagram depends on the test temperature. Some variations in the original microstructure are demonstrated.
Keywords superplasticity, test, tension, titanium alloy, microstructure, jumpwise variation in the strain rate
References
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2.  A. G. Ermachenko, "On Optimization of Regimes of Detail Processing from Titanium Allows with Scheduled Properties," Probl. Mashinostr. Avtomatiz., No. 4, 96-103 (2006).
3.  R. A. Vasin and F. U. Enikeev, Introduction to the Mechanics of Superplasticity, Part 1 (Gilem, Ufa, 1998) [in Russian].
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5.  N. Ridley, P. S. Bate, and B. Zhang, "Effect of Strain Rate Path on Cavitation in Superplastic Aluminium Alloy," Mater. Sci. Engng A 463 (1-2), 224-230 (2007).
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8.  T. Seshacharyulu, S. C. Medeiros, W. G. Frazier, and Y. V. R. K. Prasad, "Hot Working of Commercial Ti-6Al-4V with an Equiaxed α-β Microstructure: Materials Modeling Considerations," Mater. Sci. Engng A 284 (1), 184-194 (2000).
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11.  O. I. Bylja, A. G. Ermachenko, R. A. Vasin, et al., "The Influence of Simple and Complex Loading on Structure Changes in Two-Phase Titanium Alloy," Scripta Materialia 36 (8), 949-954 (1997).
12.  T. Seshacharyulu, S. C. Medeiros, W. G. Frazier, and Y. V. R. K. Prasad, "Microstructural Mechanisms during Hot Working of Commercial Grade Ti-6Al-4V with Lamellar Starting Structure," Mater. Sci. Engng A 325 (1), 112-125 (2002).
13.  S. Venugopal and P. V. Sivaprasad, "Stability Criterion to Optimize the Process Parameters and Some Applications to Design Industrial Processes," in Proc. Intern. Conf. on Recent Advances in Material Processing Technology (RAMPT'05). 2005. Dept. Mechanical Engng, National Engineering College, K. R. Nagar, Kovipatti, 628503, Tamil Nadu, India (Kovipatti, 2005).
14.  Nho-Kwang Park, Jong-Taek Yeom, and Young-Sang Na, "Characterization of Deformation Stability in Hot Forging of Conventional Ti-6Al-4V Using Processing Maps," J. Mater. Process. Tech. 130-131, 540-545 (2002).
15.  Y. V. R. K. Prasad, T. Seshacharyulu, S. C. Medeiros, and W. G. Frazier, "Influence of Oxygen Content on the Forging Response of Equiaxed (α+β) Preform of Ti-6Al-4V: Commercial vs. ELI Grade," J. Mater. Process. Tech. 108 (3), 320-327 (2001).
Received 17 October 2007
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