Silicide Formation in Ti-3Al-8V-6Cr-4Zr-4Mo |
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| Authors: | S. Ankem D. Banerjee D. J. McNeish J. C. Williams S. R. Seagle |
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| Affiliation: | (1) Engineering Materials Program, Department of Chemical and Nuclear Engineering, University of Maryland, 20742 College Park, MD;(2) Defense Metallurgical Research Laboratory, Hyderabad, India;(3) RMI Company, Niles, OH;(4) Dean of Carnegie Institute of Technology, Carnegie Mellon University, 15213 Pittsburgh, PA |
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| Abstract: | TEM, including convergent beam electron diffraction (CBED), SEM, and EDX techniques, were used to] characterize the silicide (Ti, Zr)5 Si3 which forms in Beta-C (Ti-3Al-8V-6Cr-4Zr-4Mo) and other similar titanium alloys. Space group of this silicide is determined as P6/mmm. In addition, solvus of this silicide was determined and a complete phase field diagram was constructed for Beta-C alloy. It was found that morphology and distribution of the silicide strongly depends on thermal and thermomechanical treatments. Continuous grain boundary silicide was found to be detrimental for tensil ductility which results in intergranular fracture. Thermal and thermomechanical treatments were identified which can reduce or eliminate continuous grain boundary silicide precipitation. |
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