Microstructure Refinement of Cold-Sprayed Copper Investigated By Electron Channeling Contrast Imaging

Yinyin Zhang (1) , Nicolas Brodusch (1) , Sylvie Descartes (2) , Richard R. Chromik (1) , Raynald Gauvin (1)

1 Department of Mining and Materials Engineering [Montréal]
2 LaMCoS - Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne]

The electron channeling contrast imaging technique was used to investigate the microstructure of copper coatings fabricated by cold gas dynamic spray. The high velocity impact characteristics for cold spray led to the formation of many substructures, such as high density dislocation walls, dislocation cells, deformation twins, and ultrafine equiaxed subgrains/grains. A schematic model is proposed to explain structure refinement of Cu during cold spray, where an emphasis is placed on the role of dislocation configurations and twinning.

Mots clés: cold spray; electron channeling contrast imaging; low-energy dislocation structures (LEDS); high density dislocation walls (DDWs); cell structures; deformation twinning

Domaines: Matériaux; Mécanique des matériaux [physics.class-ph]

Yinyin Zhang, Nicolas Brodusch, Sylvie Descartes, Richard R. Chromik, Raynald Gauvin. Microstructure Refinement of Cold-Sprayed Copper Investigated By Electron Channeling Contrast Imaging. Microscopy and Microanalysis, 2014, 20, pp.1499-1506. ⟨10.1017/S1431927614001664⟩. ⟨hal-01283590⟩