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Interface-Mediated Twinning-Induced Plasticity in a Fine Hexagonal Microstructure Generated by Additive

Pere Barriobero-Vila1, Juan Manuel Vallejos2, Joachim Gussone1

  • 1Institute of Materials Research, German Aerospace Center (DLR), Linder Höhe, 51147, Cologne, Germany.

Advanced Materials (Deerfield Beach, Fla.)
|October 11, 2021
PubMed
Summary

Deformation twinning in hexagonal close-packed (hcp) metals is enhanced by introducing ductile body-centered cubic (bcc) nano-layer interfaces. This novel approach improves the strength-ductility balance in hcp materials, leading to enhanced damage tolerance.

Keywords:
deformation twinninghexagonal close-packed alloysin situ high-energy synchrotron X-ray diffractionmetal 3D printingstructural properties

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Area of Science:

  • Materials Science
  • Metallurgy
  • Nanotechnology

Background:

  • Grain size is crucial for activating deformation twinning in hexagonal close-packed (hcp) metals.
  • Deformation twinning enhances the strength-ductility trade-off in structural alloys but is hindered by smaller grain sizes.
  • Activating twinning in fine-grained hcp materials remains a significant challenge.

Purpose of the Study:

  • To investigate the activation of deformation twinning in fine-grained hcp microstructures.
  • To explore the role of ductile body-centered cubic (bcc) nano-layer interfaces in promoting twinning.
  • To leverage laser-based additive manufacturing for novel material design.

Main Methods:

  • Utilizing laser-based additive manufacturing to achieve fine microstructures and generate bcc nano-layers.
  • Implementing in situ high-energy synchrotron X-ray diffraction to monitor mechanical twinning.
  • Analyzing the real-time activation and evolution of twinning.

Main Results:

  • Successfully activated deformation twinning in a fine-grained hcp microstructure.
  • Demonstrated that ductile bcc nano-layer interfaces facilitate twinning activation.
  • Observed the real-time behavior of mechanical twinning through advanced diffraction techniques.

Conclusions:

  • Ductile nano-layering is a promising strategy for designing damage-tolerant hcp materials.
  • The findings open new avenues for improving the mechanical properties of hcp alloys.
  • This research highlights the potential for enhanced material lifespan through microstructural engineering.