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  4. Characterization of Filigree Additively Manufactured NiTi Structures Using Micro Tomography and Micromechanical Testing for Metamaterial Material Models
 
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2023
Journal Article
Title

Characterization of Filigree Additively Manufactured NiTi Structures Using Micro Tomography and Micromechanical Testing for Metamaterial Material Models

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.
Author(s)
Straub, Thomas  
Fraunhofer-Institut für Werkstoffmechanik IWM  
Fell, Jonas  
Fraunhofer-Institut für Zerstörungsfreie Prüfverfahren IZFP  
Zabler, Simon  
Fraunhofer-Institut für Integrierte Schaltungen IIS  
Gustmann, Tobias
Fraunhofer-Institut für Werkzeugmaschinen und Umformtechnik IWU  
Korn, Hannes
Fraunhofer-Institut für Werkzeugmaschinen und Umformtechnik IWU  
Fischer, Sarah
Fraunhofer-Institut für Zerstörungsfreie Prüfverfahren IZFP  
Journal
Materials  
Project(s)
Beyond 3D - Tomographic Methodology, data analysis and application in material science as an integrated approach for dynamic and high throughput microscopy  
Generatively manufactured metallic metamaterials  
Characterization and reliability  
Funder
Deutsche Forschungsgemeinschaft -DFG-, Bonn  
Fraunhofer Cluster of Excellence Programmable Materials
Fraunhofer Cluster of Excellence Programmable Materials (CPM)
Open Access
DOI
10.3390/ma16020676
Language
English
Fraunhofer-Institut für Zerstörungsfreie Prüfverfahren IZFP  
Fraunhofer-Institut für Integrierte Schaltungen IIS  
Fraunhofer-Institut für Werkstoffmechanik IWM  
Fraunhofer-Institut für Werkzeugmaschinen und Umformtechnik IWU  
Keyword(s)
  • NiTi

  • shape memory alloys

  • lattice structures

  • filigree structures

  • additive manufacturing

  • micro tomography

  • micromechanical testing

  • metamaterials

  • MatBeyoNDT

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