Phase stability and mechanical properties of irradiated Ti–Al–V intermetallic compound

A Ti–35Al–10V intermetallic compound manufactured by powder metallurgy contains α2, β and γ phases. It has a better strength and ductility than the Ti–Al binary alloy containing α2 and γ phases. A typical 0.2% yield strength and total elongation of Ti–35Al–10V at 500 °C are 700 MPa and 15%, respectively. At 600 °C, the strength is still above 600 MPa and total elongation increases up to 60%. Transmission electron microscope (TEM) observation of the deformed microstructure suggests a transformation induced ductility in the β phase. After neutron irradiation of 3.5×1025 n/cm2 at 400 and 600 °C, the total elongation is only 10% at the 600 °C test, and almost no plastic elongation was observed at the 400 °C test. The TEM observation of irradiated Ti–35Al–10V did not show the formation of the ω phase.