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Multimaterial Additive Manufacturing of graded Laves phase reinforced NiAlTa structures by means of Laser Metal Deposition
Department of Additive Manufacturing, Fraunhofer Institute for Material and Beam Technology, Winterbergstraße 28, Dresden, 01277 Germany; Institute of Materials Science, Faculty of Mechanical Science and Engineering, Dresden University of Technology, Helmholtzstr. 7, Dresden, 01069 Germany.
Department of Additive Manufacturing, Fraunhofer Institute for Material and Beam Technology, Winterbergstraße 28, Dresden, 01277 Germany.
Department of Additive Manufacturing, Fraunhofer Institute for Material and Beam Technology, Winterbergstraße 28, Dresden, 01277 Germany.
Department of Additive Manufacturing, Fraunhofer Institute for Material and Beam Technology, Winterbergstraße 28, Dresden, 01277 Germany.
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2022 (English)In: Advanced Engineering Materials, ISSN 1438-1656, E-ISSN 1527-2648, Vol. 24, no 4, article id 2100993Article in journal (Refereed) Published
Abstract [en]

Recently, the Additive Manufacturing (AM) technology Laser Metal Deposition (LMD) has gained a lot of attention for processing crack prone high temperature materials such as nickel based superalloys or intermetallics. This contribution presents a feasibility study on LMD of a graded transition from binary ß-NiAl to Ni50Al42Ta8 with the aim to show the possibility of manufacturing ß-NiAl based structures with a spatially resolved microstructure and subsequently tailored mechanical properties. For achieving this the alloys Ni50Al50 and Ni50Al42Ta8 are co-injected into the process zone and the powder feeding rates are adapted in a layer-wise manner. Due to pre-heating temperatures of up to 1000 °C the transition can be manufactured with high relative density and a low degree of cold cracking. Scanning electron microscopy of the transition zone shows the formation of a fine dendritic microstructure consisting of ß-NiAl dendritic and NiAlTa interdendritic regions. Large area energy dispersive x-ray analysis reveals a gradient in NiAlTa Laves phase content with increasing build height. The observed volume fraction of Laves phase corresponds well to reported values from cast ingots. Finally, hardness measurements along the build-up direction show an increase in hardness from 300 HV0.1 to 680 HV0.1 indicating a tremendous increase in tensile strength.

Place, publisher, year, edition, pages
John Wiley & Sons, 2022. Vol. 24, no 4, article id 2100993
Keywords [en]
Additive Manufacturing, Laser Metal Deposition, Nickel Aluminides, Intermetallics, Advanced Materials, Multimaterials
National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-87380DOI: 10.1002/adem.202100993ISI: 000710320000001Scopus ID: 2-s2.0-85117699583OAI: oai:DiVA.org:ltu-87380DiVA, id: diva2:1600651
Note

Validerad;2022;Nivå 2;2022-04-20 (hanlid);

Funder: Fraunhofer internal research program FutureAM

Available from: 2021-10-05 Created: 2021-10-05 Last updated: 2022-04-20Bibliographically approved

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Brueckner, Frank

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