Effect of Fe additions on the microstructure and properties of Nb-Mo-Ti alloys.

Two Nb-Mo-Ti alloys were modified by additions of 2 at.% Fe. These small additions of Fe did not form secondary phases but noticeably increased the strength of the Nb-Mo-Ti alloys in the temperature range of 25 to 1200 °C due to solid solution strengthening effect. The oxidation resistance at 1200 °C in air was also improved considering both oxidation kinetics and the fraction of retained, un-oxidized metal alloy. • Nb-Mo-Ti-Fe alloys with single-phase BCC structures and densities of ~7.8 g/cm3 are reported. • Additions of 2 at.% Fe considerably increase strength of the alloys at temperatures from 25°C to 1200°C. • Nb-Mo-Ti-Fe alloys have good combination of strength and ductility. • The properties also depend on the amount of interstitial elements. • The alloys have slightly improved oxidation behavior relative to conventional refractory alloys. [ABSTRACT FROM AUTHOR]