Microstructure and mechanical properties of as-cast Ti–43Al–9V–0.3Y alloy

• Published in: Journal of alloys and compounds 2009-04, Vol.473 (1), p.123-126
• Main Authors: Li, B.H., Chen, Y.Y., Hou, Z.Q., Kong, F.T.
• Format: Article
• Language: English
• Subjects: Casting; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Fatigue, brittleness, fracture, and cracks; Intermetallics; Materials science; Mechanical and acoustical properties of condensed matter; Mechanical properties; Mechanical properties of solids; Microstructure; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Physics; Solidification
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2008.05.104

Microstructure and mechanical properties of an as-cast Ti–43Al–9V–0.3Y alloy have been studied. The alloy has the fine near lamellar microstructure with a lamellar colony size of about 80 μm, and a small amount of β + γ phases along colony boundaries. There also exist some β precipitations within the lamellar colonies, besides the α 2 and γ lamellae. Some disperse Y-rich particles are found as the YAl 2 phase. The alloy has moderate mechanical properties at room temperature and 700 °C. At room temperature, the ultimate tensile strength is about 511 MPa and the elongation is 0.5%. At 700 °C, the ultimate tensile strength decreases to about 426 MPa and the elongation increases to 5.7%. Cracks primarily propagate in transgranular mode in spite of the effect of test temperature.