Microstructure and texture of Al coating during kinetic spraying and heat treatment |
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Authors: | Kicheol Kang Hyungkwon Park Gyuyeol Bae Changhee Lee |
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Affiliation: | 1.Division of Materials Science& Engineering,Kinetic Spray Coating Laboratory (NRL), Hanyang University,Seoul,Republic of Korea |
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Abstract: | Microstructure and texture formation of an Al coating during kinetic spraying (or cold gas dynamic spraying) and heat treatment
were investigated. Coating formation by kinetic spraying is based on super-sonic collision of in-flight micron-sized particles
and their severe interfacial plastic deformation under ultra-high strain rates (1.0 × 106–0.5 × 109 s−1), which induces adiabatic shear instability. Shear texture, 45°-rotated Cube {001} <110>, and static recovered microstructure
were formed at the interface of Al during kinetic spraying because Al has the equivalent slip system {111} <110> of a face-centered
cubic having high stacking fault energy (SFE). During heat treatment, discontinuous recrystallization and grain growth led
to transformation of the shear texture into a strong Cube texture, {001} <100>, and misorientation angle transition. Given
the mechanical and physical properties of the Al, metallurgical mechanisms of microstructure and texture formation of kinetic-sprayed
and heat-treated Al coatings were suggested based on transmission electron microscopy and electron backscatter diffraction
analysis. |
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