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- Title
Effect of Phase Transformation Mechanism on the Microstructure of Cold-sprayed Ni/Al-AlO Composite Coatings during Post-spray Annealing Treatment.
- Authors
Yang, Guan-Jun; Zhao, Su-Ning; Li, Cheng-Xin; Li, Chang-Jiu
- Abstract
NiAl-AlO intermetallic-based composite coatings were prepared by cold spraying of Ni/Al-AlO composite powders followed by post-spray annealing treatment. The phase transformation mechanism from Ni/Al mechanical alloy to intermetallic compounds and its influence on the microstructure were examined to aim at controlling the coating microstructure. Results show that with the porous Ni/Al and Ni/Al-AlO green compacts, a self-propagating high-temperature synthesis (SHS) reaction is ignited at a temperature of 500-600 °C. However, a SHS reaction could not be ignited for the cold-sprayed dense Ni/Al and Ni/Al-AlO alloy coatings with or without a substrate. The phase transformation from Ni/Al mechanical alloy to NiAl intermetallic compound during post-spray annealing evidently can be attributed to a diffusion mechanism. Compared to the quite porous structure of the composites resulting from SHS, the composite coatings via diffusion phase transformation during post-spray annealing treatment present a relatively dense microstructure with neither large pores nor micro-sized cracks.
- Subjects
PHASE transitions; MICROSTRUCTURE; ALUMINUM oxide; ANNEALING of crystals; COMPOSITE coating; INTERMETALLIC compounds; MECHANICAL alloying
- Publication
Journal of Thermal Spray Technology, 2013, Vol 22, Issue 2/3, p398
- ISSN
1059-9630
- Publication type
Article
- DOI
10.1007/s11666-012-9857-8