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

• Published in: Metallurgist (New York) 2022-11, Vol.66 (7-8), p.942-950
• Main Authors: Shevtsova, L. I., Esikov, M. A., Lozhkin, V. S., Larichkin, A. Yu, Terentyev, D. S., Ognev, A. Yu, Drozdov, V. O., Nemolochnov, D. A.
• Format: Article
• Language: English
• Subjects: Analysis; Characterization and Evaluation of Materials; Chemistry and Materials Science; Intermetallic compounds; Intermetallic phases; Martensitic transformations; Material properties; Materials Science; Metallic Materials; Nickel aluminides; Nickel base alloys; Nickel compounds; Nickel products; Powders; Room temperature; Sintering; Sintering (powder metallurgy); Spark plasma sintering; Tensile strength
• ISSN: 0026-0894; 1573-8892
• DOI: 10.1007/s11015-022-01406-y

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 1 0 phase formation, predominate in the structure. X-ray phase analysis results of the material under study revealed the intermetallic phases Ni 3 Al and NiAl. This material has enhanced strength characteristics at r.t. ( σ u = 385 MPa and σ izg = 925 MPa) with a characteristic transcrystalline fracture. At 900°C, its tensile strength is 120 MPa.