Mechanical and oxidation properties of Ti– xFe– ySi alloys

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 328; no. 1; pp. 161 - 168
• Main Authors: Lee, D.B., Park, K.B., Jeong, H.W., Kim, S.E.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-05-2002
• Subjects: Iron; Mechanical property; Oxidation resistance; Silicon; Titanium; Titanium; Oxidation resistance; Iron; Silicon; Mechanical property
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/S0921-5093(01)01670-7

New Ti-based alloys having reasonable mechanical properties and good oxidation resistance were designed by alloying with low cost elements of iron and silicon. From tensile tests at room temperature and 400 °C, Ti–4 wt.% Fe–(0.5–2)wt.% Si alloys were found to have the optimum combination of strength and ductility, which are comparable to the Ti–6Al–4V alloy. The precipitation of fine Ti-silicides and the reduction in α/β colony sizes are primarily responsible for the obtained mechanical behavior. The air oxidation resistance of Ti–4 wt.% Fe–(0.5–2)wt.% Si alloys between 700 and 1000 °C is far superior to that of the Ti–6Al–4V alloy, and even better than that of TiAl intermetallics. The formation of amorphous silica within the TiO
2-rich oxide layers increased the oxidation resistance significantly.