The Effect of Submicron Second-Phase Particles on the Rate of Grain Refinement in a Copper-Oxygen Alloy During Cold Spray
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Abstract
The effect of non-deformable submicron second-phase particles (d = 200-500 nm) on microstructural refinement during cold spray was examined. Using single particle impact testing, two types of splats were fabricated using two different feedstocks: a Cu-0.21wt.%O powder containing Cu2O second-phase particles and a single-phase Cu. Microstructural evolution analysis using high-resolution electron backscatter diffraction shows grain refinement occurred at a higher rate in the Cu-0.21wt.%O powder. That was due to dynamic recrystallization initiated by particle-stimulated nucleation (PSN). High-strain-rate deformation of cold spray was found to be the key to activate PSN. The present study suggests cold spray is a possible technique to fabricate ultrafine-grained materials by using feedstock containing second-phase particles.
Keywords
cold spray high-resolution electron backscatter diffraction (EBSD) particle-stimulated nucleation (PSN) second-phase particlesNotes
Acknowledgments
The authors gratefully acknowledge the financial support from Natural Sciences and Engineering Research Council (NSERC) of Canada, Engage Grants Program. We acknowledge helpful discussions with Dr. Jing Su at department of Materials Engineering in McGill University. The authors acknowledge administrative support from Drs. Stephen Yue, Eric Irissou and Jean-Gabriel Legoux and technical support from Mr. Jean Francois Alarie at the McGill Aerospace Materials and Alloy Design Center (MAMADC) cold spray facility.
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