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ASME Press Select Proceedings
International Conference on Computer and Electrical Engineering 4th (ICCEE 2011)
Jianhong Zhou
Jianhong Zhou
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ASME Press
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Superplasticity is generally achieved in titanium alloys with a fine grained microstructure when deformation is carried out under narrow ranges of strain rates and temperature. Under these conditions, titanium alloys show large elongations (i.e. optimal superplasticity) with a relatively stable microstructure. In superplastic deformation (SPD) process, strain-rate sensitivity exponent (m) is a critical parameter, which value quantifies the optimal superplasticity. In real industrial applications, maintaining these narrow ranges of condition required for optimal superplastic flow from beginning to end is a very difficult and challenging task. When the aforesaid conditions lie beyond a certain limit (i.e. at near superplastic regime) during deformation process, non-stationary process of superplastic deformation is observed. The microstructure changes actively during the non-stationary process of superplastic deformation. Near alpha titanium alloy has been used in this study to find out those parameters of microstructure, which are varying significantly during non-stationary process of superplastic deformation. Tensile tests have been carried out at 9300C with a constant strain rate of 5*101’4 s1’1 and a jump wise varying strain rate of 1*101’4 s1’1 & 5*101’4 s1’1. Results indicated that microstructural parameters i.e. percentages of alpha phase, number of alpha grains per unit area and size of alpha grain varied significantly during non-stationary process of superplastic deformation. Deformation induced phase transformation is also observed in near alpha titanium alloys during non-stationary process of superplastic deformation. Optical microscope, Scanning electron microscope, micro Vickers hardness test, XRD, etc have been used in order to characterize the microstructure of the material.

Key Words
1. Introduction
2. Experiments
3. Material Characterization
4. Microstructural Parameters
5. Results
6. Discussions
7. Conclusions
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