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Elemental segregation in an AlCoCrFeNi high-entropy alloy: A comparison between selective laser melting and induction melting
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.
Rhein Westfal TH Aachen, Mat Chem, Kopernikusstr 10, D-52074 Aachen, Germany.
Sandvik Machining Solut AB, Sandvik Addit Mfg, Mossvagen 10, SE-81181 Sandviken, Sweden.
Sandvik Machining Solut AB, Sandvik Addit Mfg, Mossvagen 10, SE-81181 Sandviken, Sweden.
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2019 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 784, p. 195-203Article in journal (Refereed) Published
Abstract [en]

Additive manufacturing of a high-entropy alloy, AlCoCrFeNi, was studied with selective laser melting from gas atomized powder. A wide process parameter window in the SLM process was investigated but it was impossible to produce crack-free samples, attributed to stresses that originate during the building processes. The microstructure and elemental segregation in the SLM samples were compared with induction-melted AlCoCrFeNi. The induction-melted sample crystallizes in randomly oriented large grains (several hundred microns). Dendritic and inter-dendritic areas with slightly different chemical composition can be observed. Within these areas a spinodal decomposition occurs with a separation into FeCr- and NiAl-rich domains. Further spinodal decomposition within the FeCr-rich regions into Cr- and Fe-rich domains was observed by atom probe tomography.

In contrast, the SLM-samples crystallizes in much smaller grains (less than 20 μm) with a dendrite-like substructure. These dendrite-like features exhibit distinct chemical fluctuations on the nm-scale. During annealing more pronounced chemical fluctuations and the formation of Cr-rich and Cr-poor regions can be observed. The difference in microstructure and spinodal decomposition between the induction-melted and SLM samples is attributed to the significantly higher cooling rate for SLM. This study shows that, by using different synthesis pathways, it is possible to modify the microstructure and segregation of element within alloys. This can be used to tune the materials properties, if the cracking behavior is handled e.g. by change of alloy composition to minimize phase transformations or use of a heating stage.

Place, publisher, year, edition, pages
2019. Vol. 784, p. 195-203
Keywords [en]
Additive manufacturing, Selective laser melting (SLM), High-entropy alloy, Spinodal decomposition
National Category
Metallurgy and Metallic Materials Materials Chemistry Manufacturing, Surface and Joining Technology
Identifiers
URN: urn:nbn:se:uu:diva-379323DOI: 10.1016/j.jallcom.2018.12.267ISI: 000459796400023OAI: oai:DiVA.org:uu-379323DiVA, id: diva2:1300546
Funder
Swedish Foundation for Strategic Research Available from: 2019-03-28 Created: 2019-03-28 Last updated: 2019-03-28Bibliographically approved

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Karlsson, DennisSahlberg, MartinJansson, Ulf

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Inorganic ChemistryDepartment of Chemistry - Ångström
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Journal of Alloys and Compounds
Metallurgy and Metallic MaterialsMaterials ChemistryManufacturing, Surface and Joining Technology

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