Microstructure, phase composition, and oxidation resistance of alloys of Nb-Ti-Al system produced by electron beam melting and zone melting

Abstract

Titanium aluminides and alloys based on them are promising heat-resistant materials. These alloys are promising for using in equipment working under severe conditions, in particular in aircraft construction, mechanical engineering and space technology. The main techniques of providing the necessary complex of mechanical properties of intermetallic alloys are electron beam melting or zone melting. The work demonstrates that ternary alloys of the Nb-Ti-Al system can be used to optimize the parameters of electron beam melting and zone melting to provide enhanced properties of titanium alloys. The heat resistance of alloys based on the Nb-Ti-Al system is determined. The oxidation behavior of these alloys during high-temperature annealing at 1200^оС for 120 min is studied.