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Formation of Refined Grains Below 10 nm in Size and Nanoscale Interlocking in the Particle-Particle Interfacial Regions of Cold Sprayed Pure Aluminum

16 Pages Posted: 31 Jul 2019 Publication Status: Accepted

See all articles by Zhiying Liu

Zhiying Liu

University of Toronto - Department of Materials Science and Engineering

Hongze Wang

National Research Council Canada

Michel Haché

University of Toronto - Department of Materials Science and Engineering

Eric Irissou

National Research Council Canada

Yu Zou

University of Toronto - Department of Materials Science and Engineering

Abstract

It has been a long-standing challenge to obtain nanocrystalline pure aluminum with grain sizes below 10 nm by plastic deformation. Here, we studied the microstructure characteristics of two bonded pure aluminum powder particles after a cold spray process. In the particle-particle bonding region, we show gradient nanometer-sized grains, about 30% of which are below 10 nm in size. We have also observed perturbations with interlocking features assisted mechanical bonding. The formation of nanoscale grains and interlocking features is attributed to the extremely high strain and strain rate combined with shear instability during the cold spray process.

Keywords: Plastic deformation, Recrystallization, Nanostructures, Cold spray, Pure aluminum

Suggested Citation

Liu, Zhiying and Wang, Hongze and Haché, Michel and Irissou, Eric and Zou, Yu, Formation of Refined Grains Below 10 nm in Size and Nanoscale Interlocking in the Particle-Particle Interfacial Regions of Cold Sprayed Pure Aluminum (July 27, 2019). Available at SSRN: https://ssrn.com/abstract=3427486 or http://dx.doi.org/10.2139/ssrn.3427486

Zhiying Liu

University of Toronto - Department of Materials Science and Engineering

Canada

Hongze Wang (Contact Author)

National Research Council Canada

1200 Montreal Road
Ottawa, ON K1A 0R6
Canada

Michel Haché

University of Toronto - Department of Materials Science and Engineering

Canada

Eric Irissou

National Research Council Canada

1200 Montreal Road
Ottawa, ON K1A 0R6
Canada

Yu Zou

University of Toronto - Department of Materials Science and Engineering ( email )

Canada

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