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Metallurgist

05-09-2024

Formation of VKNA-4U powder alloy using the SPS technology with preliminary mechanical activation

Authors: Liliya I. Shevtsova, Maksim A. Esikov, Vladimir N. Malikov, Ruslan I. Kuz’min

Published in: Metallurgist

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Abstract

The results of structural studies and assessment of the bending strength of a VKNA-4U alloy based on nickel aluminide are presented. It is for the first time that this alloy was produced by spark plasma sintering of mechanically activated powders of the starting components. The mechanical activation of the powders lasted for 1.5, 3.5, and 5 min. X‑ray diffraction analysis was performed to determine the optimal duration (3 min 30 sec) of mechanical activation for this alloy. To obtain a dense low-defect workpiece, the VKNA-4U alloy was sintered at a heating temperature of 1100 °C, a pressure of 40 MPa, and a holding time of 5 min. This material has higher ultimate bending strength at room temperature (σ_bend = 1215 ± 65 MPa) than the strength of Ni₃Al intermetallic compound produced in similar conditions and microhardness 690 ± 25 HV.

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Title: Formation of VKNA-4U powder alloy using the SPS technology with preliminary mechanical activation
Authors: Liliya I. Shevtsova
Maksim A. Esikov
Vladimir N. Malikov
Ruslan I. Kuz’min
Publication date: 05-09-2024
Publisher: Springer US
Published in: Metallurgist
Print ISSN: 0026-0894
Electronic ISSN: 1573-8892
DOI: https://doi.org/10.1007/s11015-024-01781-8