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

Advanced Materials, vol. 33, pp. e2105096

Abstract

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.

Authors 8

1. Pere Barriobero Vila corresponding

   Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)

   Affiliation as printed

   Institute of Materials Research German Aerospace Center (DLR) Linder Höhe 51147 Cologne Germany

2. Juan Manuel Vallejos

   Consejo Nacional de Investigaciones Científicas y Técnicas · National University of Rosario · Institute of Physics Rosario

   Affiliation as printed

   Rosario Physics Institute National University of Rosario CONICET‐UNR Bv. 27 de febrero 210 bis Rosario Santa Fe 2000 Argentina

   Rosario Physics Institute, National University of Rosario CONICET-UNR, Bv. 27 de febrero 210 bis, Rosario, Santa Fe, 2000 Argentina

3. Joachim Gussone

   Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)

   Affiliation as printed

   Institute of Materials Research German Aerospace Center (DLR) Linder Höhe 51147 Cologne Germany

4. Jan Haubrich

   Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)

   Affiliation as printed

   Institute of Materials Research German Aerospace Center (DLR) Linder Höhe 51147 Cologne Germany

5. Klemens Kelm

   Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)

   Affiliation as printed

   Institute of Materials Research German Aerospace Center (DLR) Linder Höhe 51147 Cologne Germany

6. Andreas Stark

   Helmholtz-Zentrum Hereon

   Affiliation as printed

   Helmholtz‐Zentrum Hereon Max‐Planck‐Straße 1 21502 Geesthacht Germany

7. Norbert Schell

   Helmholtz-Zentrum Hereon

   Affiliation as printed

   Helmholtz‐Zentrum Hereon Max‐Planck‐Straße 1 21502 Geesthacht Germany

8. Guillermo Carlos Requena Aachen

   Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR) · RWTH Aachen University

   Affiliation as printed

   Institute of Materials Research German Aerospace Center (DLR) Linder Höhe 51147 Cologne Germany

   Metallic Structures and Materials Systems for Aerospace Engineering RWTH Aachen University 52062 Aachen Germany

   Metallic Structures and Materials Systems for Aerospace Engineering, RWTH Aachen University, 52062 Aachen, Germany