Rapid grain refinement and compositional homogenization in a cast binary Cu50Ni alloy achieved by friction stir processing

Publikation: Beiträge in ZeitschriftenZeitschriftenaufsätzeForschung

Authors

  • Julian Escobar
  • Bharat Gwalani
  • Joshua Silverstein
  • Tanvi Ajantiwalay
  • Christian Roach
  • Luciano Bergmann
  • Jorge F. dos Santos
  • Emad Maawad
  • Benjamin Klusemann
  • Arun Devaraj
Friction stir processing (FSP) has been increasingly adopted for joining and processing materials in automotive, aerospace, and industrial construction. During FSP, a dynamic competition between high-speed shear deformation and deformation-induced heating brings about a complex competition between multiple dynamic microstructural evolution mechanisms making it difficult to predict the microstructural evolution pathway. Hence, improved understanding of microstructural evolution mechanisms during FSP can be beneficial for continued growth in the adoption of FSP for demanding applications of future. Towards this goal, this study uses a model binary Cu – 50 at.% Ni alloy to clarify the effect of single and double pass FSP on the microstructural evolution of a coarse grained and compositionally heterogeneous cast microstructure. High energy synchrotron X-ray diffraction, electron backscatter diffraction, and nanoindentation are used to clarify the microstructural evolution due to FSP. The process of compositional homogenization of as-cast segregations is studied by energy dispersive spectroscopy and atom probe tomography. Our results show that a single fast FSP pass at 30 mm.s−1 produces a 100 μm deep layer of submicrometric and hall-petch hardened CuNi grains. The initial cast compositional heterogeneities in a micrometric scale is rapidly transformed to nano-sized domains, mainly confined at grain boundaries. Double pass FSP increases the penetration depth of the processed layer and leads to a 2.9 times grain growth relative to single pass FSP. Grain fragmentation, discontinuous dynamic recrystallization, grain growth, and twinning mechanisms are discussed. These results highlight the value of FSP for ultrafast grain refinement and compositional homogenization of cast alloys.
OriginalspracheEnglisch
Aufsatznummer112999
ZeitschriftMaterials Characterization
Jahrgang202
Anzahl der Seiten10
ISSN1044-5803
DOIs
PublikationsstatusErschienen - 01.08.2023

Bibliographische Notiz

Funding Information:
This work was supported by the Laboratory Directed Research and Development program at Pacific Northwest National Laboratory (PNNL) as part of the Solid Phase Processing Science Initiative . A portion of this research was performed using facilities at the Environmental Molecular Sciences Laboratory, a national scientific user facility sponsored by the U.S. Department of Energy's (DOE's) Biological and Environmental Research Program and located at PNNL. PNNL is a Multiprogram National Laboratory operated by Battelle for the DOE under Contract DEAC05-76RL01830 . Parts of this research were carried out at PETRA III at DESY, a member of the Helmholtz Association . We would like to thank Dr. Norbert Schell and Dr. Peter Staron for their assistance during the data collection and analysis at the P07 beamline.

Funding Information:
This work was supported by the Laboratory Directed Research and Development program at Pacific Northwest National Laboratory (PNNL) as part of the Solid Phase Processing Science Initiative. A portion of this research was performed using facilities at the Environmental Molecular Sciences Laboratory, a national scientific user facility sponsored by the U.S. Department of Energy's (DOE's) Biological and Environmental Research Program and located at PNNL. PNNL is a Multiprogram National Laboratory operated by Battelle for the DOE under Contract DEAC05-76RL01830. Parts of this research were carried out at PETRA III at DESY, a member of the Helmholtz Association. We would like to thank Dr. Norbert Schell and Dr. Peter Staron for their assistance during the data collection and analysis at the P07 beamline.

Publisher Copyright:
© 2023

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