Effect of alloying elements on the properties of Ti-Al-Si alloys prepared by powder metallurgy

摘要: Abstract Intermetallic alloys based on Ti-Al-Si system are significant for their excellent high-temperature properties, especially resistance against oxidation and achieving good mechanical properties at elevated temperatures. The main problem of these materials is high brittleness room temperature. In the previous work, selected alloying elements were added into prepared by reactive sintering, but did not meet requirements subsequent use in automotive or aerospace industry, since had a very porous microstructure. Here, addition cobalt, chromium, iron, molybdenum, niobium nickel TiAl15Si15 alloy Spark Plasma Sintering tested it expected to improve properties. this paper, have been assessed basis microstructure, phase composition, tribological such as hardness, fracture toughness compressive strength. Cyclic tests performed 400 h temperatures 800 1000 °C. cyclic simulate industrial processes, where material alternately exposed temperature cooling (eg, engine components). From viewpoint most seems be promising.