Formation of refined grains below 10 nm in size and nanoscale interlocking in the particle–particle interfacial regions of cold sprayed pure aluminum

DOI	Resolve DOI: https://doi.org/10.1016/j.scriptamat.2019.09.018
Author	Search for: Liu, Zhiying; Search for: Wang, Hongze; Search for: Haché, Michel; Search for: Irissou, Eric¹; Search for: Zou, Yu ORCID identifier: https://orcid.org/0000-0002-0179-3642
Affiliation	National Research Council of Canada. Automotive and Surface Transportation
Format	Text, Article
Subject	plastic deformation; recrystallization; nanostructures; cold spray; pure aluminum
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, nanometer-sized grains are revealed, about 30% of which are below 10 nm in size. In the particle–particle interface, we observe nanoscale perturbations with interlocking features assisting mechanical bonding. The formation of nanoscale grains and interlocking features is attributed to the extremely high strain and strain rate combined with shear instability in the cold spray process.
Publication date	2019-10-21
Publisher	Elsevier
In	Scripta Materialia 177 (1 March 2020): 96–100.
Language	English
Peer reviewed	Yes
Identifier	S1359646219305524
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Record identifier	eb3d2ee9-7dc8-4677-8e9b-bfdf76282367
Record created	2020-07-07
Record modified	2021-09-17