Structure and Properties of Materials Produced by SPS Sintering of Nickel Aluminide Powders PN85U15 and PN75U23V

摘要

This article presents the structure and evaluation of strength properties at room temperature (r.t.) and at 900°C of materials based on nickel aluminide obtained via electrospark sintering at 1100°C of industrial powders of two grades, PN85U15 and PN75U23V, separately and mixed preliminarily with each other in the ratio of 7:3. When powders of two types are mixed, regions with a typical banded pattern, resulting from the martensitic transformation and L?10 phase formation, predominate in the structure. X-ray phase analysis results of the material under study revealed the intermetallic phases Ni3Al and NiAl. This material has enhanced strength characteristics at r.t. (σu = 385 MPa and σizg = 925 MPa) with a characteristic transcrystalline fracture. At 900°C, its tensile strength is 120 MPa.