Study of the structure and properties of heat-resistant alloys based on titanium aluminides with gadolinium microadditives

摘要

The results of the research works on the development, study, and approbation of promising heatresistant REE-containing intermetallic alloys based on ortho- and gamma-titanium aluminides (Ti2AlNb, TiAl) performed at the All-Russian Scientific Research Institute of Aviation Materials (VIAM) for solving the current problems of aircraft engine construction within the implementation of the complex scientific direction 7.1 “Intermetallic Alloys Based on Titanium” (“Strategic Directions of the Development of Materials and Technologies of Their Processing for the Period until 2030”) [1] are presented. The energy-efficient technological regimes of vacuum arc melting of ingots made of ortho and gamma alloys and having a homogeneous chemical composition and structure are developed; it is shown that the introduction of gadolinium microadditives in the amount of 0.05-0.2 at % into the studied alloys gives a significant modifying effect and forms a finely lamellar structure in ingots, which is favorable from the point of view of the combination of heat-resistant and performance properties. The structural changes and the combination of mechanical characteristics of new VIT5 ortho alloy depending on the heat treatment regimes are studied.