The deformation and fracture of Ti3Al at elevated temperatures
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The tensile properties of the intermetallic compound Ti3Al have been determined in air at several temperatures within the range of 25 to 900 °C. The dislocation structures produced by the various testing conditions were studied in the electron microscope and the fracture modes were studied in the scanning electron microscope. These microstructural observations were correlated with the mechanical properties. The results indicate that Ti3Al has only limited ductility even at 900 °C. The apparent ductile-brittle transition which occurs above 600 °C is due to increasing amounts of intergranular cracking. Some increase in ductility above 600 °C is due to the onset of dislocation cross slipping. The fracture mode up to 600 °C is entirely cleavage. Above 600 °C the fracture shows increasing evidence of plasticity; however, cleavage remains the main fracture mode up to 900 °C.
Formerly with the Materials Laboratory
Formerly in the Processing and High Temperature Materials Branch
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- The deformation and fracture of Ti3Al at elevated temperatures
Metallurgical Transactions A
Volume 11, Issue 8 , pp 1369-1375
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- 1. Processing and High Temperature Materials Branch, Metals and Ceramics Division, Materials Laboratory, Air Force Wright Aeronautical Laboratories, 45433, Wright-Patterson AFB, OH
- 2. Department of Materials Engineering, Technion, Haifa, Israel
- 3. Computer Integrated Manufacturing Branch, Manufacturing Technology Division, Materials Laboratory, Air Force Wright Aeronautical Laboratories, 45433, Wright-Patterson AFB, OH