Mechanical and fracture behavior of powder metalurgy processed Ti sub(3)Al-based alloys

• Published in: Journal of materials science Vol. 41; no. 13; pp. 4307 - 4313
• Main Authors: Dimcic, B, Cvijovic, I, Jovanovic, M T, Bozic, D, Dimcic, O
• Format: Journal Article
• Language: English
• Published: 01.07.2006
• Subjects: Alloys; Compacting; Compacts; Compression tests; Compressive strength; Ductility; Fracture mechanics; Scanning electron microscopy
• ISSN: 0022-2461
• DOI: 10.1007/s10853-006-7002-0

This work considers structural and compression mechanical properties of three Ti sub(3)Al-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 1050C (a + b region) for 1h, followed by water quenching. The compression tests were performed from room temperature to 500C in vacuum at a strain rate of 2.4 x 10 super(-3) s super(-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 Ti sub(3)Al-Nb alloy exhibits the highest ductility in the whole temperature range, whereas addition of Mo to Ti sub(3)Al-Nb alloy yields the highest ultimate compression strength. A correlation between ductility and the fracture mode exists for all materials.