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On the Impact of Additive Manufacturing Processes on the Microstructure and Magnetic Properties of Co–Ni–Ga Shape Memory Heusler Alloys

Scheibel, Franziska ; Lauhoff, Christian ; Riegg, Stefan ; Krooß, Philipp ; Bruder, Enrico ; Adabifiroozjaei, Esmaeil ; Molina-Luna, Leopoldo ; Böhm, Stefan ; Chumlyakov, Yury I. ; Niendorf, Thomas ; Gutfleisch, Oliver (2022):
On the Impact of Additive Manufacturing Processes on the Microstructure and Magnetic Properties of Co–Ni–Ga Shape Memory Heusler Alloys. (Publisher's Version)
In: Advanced Engineering Materials, 24 (10), Wiley-VCH, e-ISSN 1527-2648,
DOI: 10.26083/tuprints-00022901,
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Item Type: Article
Origin: Secondary publication DeepGreen
Status: Publisher's Version
Title: On the Impact of Additive Manufacturing Processes on the Microstructure and Magnetic Properties of Co–Ni–Ga Shape Memory Heusler Alloys
Language: English
Abstract:

Microstructure design allows to prevent intergranular cracking and premature failure in Co–Ni–Ga shape memory alloys. Favorable grain boundary configurations are established using additive manufacturing techniques, namely, direct energy deposition (DED) and laser powder bed fusion (L‐PBF). L‐PBF allows to establish a columnar grain structure. In the Co–Ni–Ga alloy processed by DED, a microstructure with strong ⟨001⟩ texture is obtained. In line with optimized microstructures, the general transformation behavior is essential for performance. Transition parameters such as transition temperature and thermal hysteresis depend on chemical composition, homogeneity, and presence of precipitates. However, these parameters are highly dependent on the processing method used. Herein, the first‐order magnetostructural transformation and magnetization properties of Co–Ni–Ga processed by DED and L‐PBF are compared with single‐crystalline and as‐cast material. In the alloy processed by L‐PBF, Ga evaporation and extensive formation of the ferromagnetic Co‐rich γ'‐phase are observed, promoting a very wide transformation range and large thermal hysteresis. In comparison, following DED, the material is characterized by minor chemical inhomogeneity and transition and magnetization behavior being similar to that of a single crystal. This clearly renders DED‐processed Co–Ni–Ga to become a promising candidate material for future shape memory applications.

Journal or Publication Title: Advanced Engineering Materials
Volume of the journal: 24
Issue Number: 10
Place of Publication: Darmstadt
Publisher: Wiley-VCH
Collation: 11 Seiten
Uncontrolled Keywords: additive manufacturing, direct microstructure designs, first-order magnetostructural transitions, magnetic characterizations, shape memory alloys
Classification DDC: 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
600 Technik, Medizin, angewandte Wissenschaften > 660 Technische Chemie
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Advanced Electron Microscopy (aem)
11 Department of Materials and Earth Sciences > Material Science > Functional Materials
11 Department of Materials and Earth Sciences > Material Science > Physical Metallurgy
Date Deposited: 28 Nov 2022 14:13
Last Modified: 08 Dec 2022 06:45
DOI: 10.26083/tuprints-00022901
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-229015
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/22901
PPN: 502348062
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