Mechanical and fracture behavior of powder metalurgy processed Ti3Al-based alloys |
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Authors: | B. Dimčić I. Cvijović M. T. Jovanović D. Božić O. Dimčić |
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Affiliation: | (1) Department of Material Science, Institute of Nuclear Sciences ≪Vinča≫, P.O. Box 522, 11001 Belgrade, Serbia and Montenegro;(2) TCF, Mihajlo Pupin Boulevard 176, Belgarde, Serbia and Montenegro |
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Abstract: | This work considers structural and compression mechanical properties of three Ti3Al-based alloys processed by powder metallurgy. Mechanically alloyed powders were compacted by hot-pressing to non-porous homogenous compacts. Prior to compression tests, all compacts were homogenized by a solution treatment at 1050°C (α + β region) for 1h, followed by water quenching. The compression tests were performed from room temperature to 500°C in vacuum at a strain rate of 2.4 × 10−3 s−1. Detailed microstructural characterization has been evaluated by scanning electron microscopy (SEM), followed by electron dispersive spectroscopy (EDS) and X-ray diffraction analysis. Fracture topography was examined by SEM. The Ti3Al-Nb alloy exhibits the highest ductility in the whole temperature range, whereas addition of Mo to Ti3Al-Nb alloy yields the highest ultimate compression strength. A correlation between ductility and the fracture mode exists for all materials. |
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