Mechanical and fracture behavior of powder metalurgy processed Ti3Al-based alloys

• Published in: Journal of materials science 2006-07, Vol.41 (13), p.4307-4313
• Main Authors: DIMCIC, B, CVIJOVIC, I, JOVANOVIC, M. T, BOZIC, D, DIMCIC, O
• Format: Article
• Language: English
• Subjects: Alloy powders; Alloys; aluminum; ambient temperature; Applied sciences; Compacts; Compression tests; Compressive strength; Ductility; energy-dispersive X-ray analysis; Exact sciences and technology; Fractures; Intermetallic compounds; Materials science; Mechanical alloying; Mechanical properties; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; metallurgy; Metals. Metallurgy; Molybdenum; niobium; Niobium base alloys; Powder metallurgy; powders; Scanning electron microscopy; Solution heat treatment; spectroscopy; Strain rate; titanium; Titanium aluminides; topography; Water quenching; X-ray diffraction
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-006-7002-0

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.