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Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing
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Characterization of Filigree Additively Manufactured NiTi Structures Using Micro Tomography and Micromechanical

Thomas Straub1,2, Jonas Fell3, Simon Zabler4

  • 1Fraunhofer Cluster of Excellence Programmable Materials, 79108 Freiburg im Breisgau, Germany.

Materials (Basel, Switzerland)
|January 21, 2023
PubMed
Summary

Additive manufacturing process strategies influence the microstructure and mechanical properties of filigree Nickel-Titanium (NiTi) specimens. Precise testing of these structures is crucial for developing advanced metamaterials with tailored behavior.

Keywords:
NiTiadditive manufacturingfiligree structureslattice structuresmetamaterialsmicro tomographymicromechanical testingshape memory alloys

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Area of Science:

  • Materials Science
  • Additive Manufacturing
  • Metamaterials Engineering

Background:

  • Additive manufacturing enables the creation of complex microstructures.
  • Nickel-Titanium (NiTi) alloys exhibit unique superelastic properties.
  • Metamaterials offer tunable mechanical responses through intricate designs.

Purpose of the Study:

  • To investigate how additive manufacturing process strategies affect NiTi specimen geometry, microstructure, and mechanical properties.
  • To understand the relationship between process parameters, specimen diameter, and microstructure.
  • To assess the impact of these factors on the design of metamaterials.

Main Methods:

  • Laser powder bed fusion was used to fabricate filigree NiTi specimens (180-350 µm diameter).
  • Optical microscopy, electron microscopy, and micro tomography were employed for microstructural characterization.
  • Micro tensile testing was performed to evaluate mechanical performance.

Main Results:

  • Process strategies influenced microstructure (grain size) without compromising porosity.
  • All NiTi specimens demonstrated superelastic behavior.
  • Critical martensitic phase transition stress decreased with increasing vector length.

Conclusions:

  • Additive manufacturing process control is key to tailoring NiTi microstructure and properties.
  • Accurate characterization and testing of additively manufactured filigree structures are essential for metamaterial design.
  • This research contributes to the development of metamaterials with locally adjustable mechanical behavior.