Please use this identifier to cite or link to this item: doi:10.22028/D291-38795
Title: Characterization of Filigree Additively Manufactured NiTi Structures Using Micro Tomography and Micromechanical Testing for Metamaterial Material Models
Author(s): Straub, Thomas
Fell, Jonas
Zabler, Simon
Gustmann, Tobias
Korn, Hannes
Fischer, Sarah C. L.
Language: English
Title: Materials
Volume: 16
Issue: 2
Publisher/Platform: MDPI
Year of Publication: 2023
Free key words: NiTi
shape memory alloys
lattice structures
filigree structures
additive manufacturing
micro tomography
micromechanical testing
DDC notations: 500 Science
Publikation type: Journal Article
Abstract: This study focuses on the influence of additive manufacturing process strategies on the specimen geometry, porosity, microstructure and mechanical properties as well as their impacts on the design of metamaterials. Filigree additively manufactured NiTi specimens with diameters between 180 and 350 µm and a nominal composition of Ni50.9Ti49.1 (at %) were processed by laser powder bed fusion in a first step. Secondly, they structures were characterized by optical and electron microscopy as well as micro tomography to investigate the interrelations between the process parameters, specimen diameters and microstructure. Each specimen was finally tested in a micro tensile machine to acquire the mechanical performance. The process strategy had, besides the resulting specimen diameter, an impact on the microstructure (grain size) without negatively influencing its quality (porosity). All specimens revealed a superelastic response while the critical martensitic phase transition stress decreased with the applied vector length. As a conclusion, and since the design of programmable metamaterials relies on the accuracy of FEM simulations, precise and resource-efficient testing of filigree and complex structures remains an important part of creating a new type of metamaterials with locally adjusted material behavior.
DOI of the first publication: 10.3390/ma16020676
URL of the first publication:
Link to this record: urn:nbn:de:bsz:291--ds-387959
ISSN: 1996-1944
Date of registration: 23-Jan-2023
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Materialwissenschaft und Werkstofftechnik
Professorship: NT - Keiner Professur zugeordnet
Collections:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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