Journal
ADVANCED MATERIALS
Volume 33, Issue 52, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202105096
Keywords
deformation twinning; hexagonal close-packed alloys; in situ high-energy synchrotron X-ray diffraction; metal 3D printing; structural properties
Categories
Funding
- Projekt DEAL
- Deutsches Elektronen-Synchrotron (DESY) [I-20191042]
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This study discovered the activation of deformation twinning in a fine-grained hcp microstructure by introducing ductile body-centered cubic (bcc) nano-layer interfaces. The fast solidification and cooling conditions of laser-based additive manufacturing, together with intensified intrinsic heat treatment, allowed for the creation of ductile nano-layered structures with the potential to improve the lifespan of hcp damage tolerant materials.
The grain size is a determinant microstructural feature to enable the activation of deformation twinning in hexagonal close-packed (hcp) metals. Although deformation twinning is one of the most effective mechanisms for improving the strength-ductility trade-off of structural alloys, its activation is reduced with decreasing grain size. This work reports the discovery of the activation of deformation twinning in a fine-grained hcp microstructure by introducing ductile body-centered cubic (bcc) nano-layer interfaces. The fast solidification and cooling conditions of laser-based additive manufacturing are exploited to obtain a fine microstructure that, coupled with an intensified intrinsic heat treatment, permits to generate the bcc nano-layers. In situ high-energy synchrotron X-ray diffraction allows tracking the activation and evolution of mechanical twinning in real-time. The findings obtained show the potential of ductile nano-layering for the novel design of hcp damage tolerant materials with improved life spans.
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