MSE 2024
Highlight Lecture
25.09.2024
Processability and functional properties of a high entropy alloy manufactured via directed energy deposition (DED) using mixed powders.
AH

Ahmed Halkoum

Universität Kassel

Halkoum, A. (Speaker)¹; Stredak, F.²; Krooß, P.²; Molotnikov, A.³; Böhm, S.²; Niendorf, T.²
¹University of Kassel / Royal Melbourne Insitute of Technology (RMIT); ²University of Kassel; ³Royal Melbourne Insitute of Technology (RMIT)
Vorschau
21 Min. Untertitel (CC)

Refractory High Entropy Alloys (RHEAs), despite their significant potential, are among the least investigated categories of High Entropy Alloys (HEAs) in the field of Additive Manufacturing (AM). This can be attributed to the high cost of pre-alloyed powders and the difficulty of acquiring these alloys promptly with quantities that are suitable to research purposes. In the present study, Ni38.2Ti36.8Hf11.3Nb4Cu9.7 HEA was manufactured via Directed Energy Deposition (DED) using a blended powder mixed from 3 different powders (elemental and pre-alloyed). The homogeneity of the mixed powder as well as the oxygen content were analyzed to characterise the feedstock material. Moreover, a detailed characterization of process-induced defects, microstructure, and functional properties were performed using SEM, EBSD, EDX, DSC, TEM and microhardness testing. The as-built microstructure consists of multiple phases with a distribution of fine precipitates at the micro and nano scale. For homogenization of the microstructure, the material was heat treated at 1000°C for 24hrs. The results clearly show the feasibility of AM for realizing a refractory HEA using the mixed powder.

Abstract

Abstract

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