A composite material based on Al2O3 dispersion-strengthened nickel aluminide

Abstract

A method for the preparation of a composite material (CM) strengthened by alumina particles with a columnar structure on the basis of a VKNA-4U alloy is described. The method includes the preparation of heat-resistant nickel alloy powders with a particle size of ≤100 μm. The resulting matrix alloy powders are subjected to spraying and mechanical alloying with an Al₂O₃ reinforcing additive in an attritor and then to extrusion and subsequent rolling. The process parameters of the preparation of a CM based on the nickel aluminide–alumina system are determined. The developed material is intended for advanced aircraft engines, primarily uncooled and hollow highand low-pressure turbine blades and other parts and assemblies of an uncooled turbine. The physicomechanical properties of the resulting powdered material are studied.