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Structural Transformation and Mechanical Properties of Cold Sprayed Nickel Coatings after Annealing

Published online by Cambridge University Press:  01 February 2011

Yu Zou ,
Ahmad Rezaeian ,
Jerzy Szpunar ,
Eric Irissou  and
Stephen Yue
Yu Zou
Affiliation:
yu.zou@mail.mcgill.ca, McGill University, Department of Mining and Materials Engineering, Montreal, Canada
Ahmad Rezaeian
Affiliation:
ahmad.rezaeian@mcgill.ca, McGill University, Department of Mining and Materials Engineering, Montreal, Canada
Jerzy Szpunar
Affiliation:
jerzy.szpunar@mcgill.ca, McGill University, Department of Mining and Materials Engineering, Montreal, Canada
Eric Irissou
Affiliation:
Eric.Irissou@imi.cnrc-nrc.gc.ca, National Research Council Canada (NRC), Industrial Materials Institute (IMI), Boucherville, Canada
Stephen Yue
Affiliation:
steve.yue@mcgill.ca, McGill University, Department of Mining and Materials Engineering, Montreal, Canada
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Abstract

Cold spray is a relatively new coating technology in which coatings can be produced by powdered particles under large plastic deformation without significant heating. In this paper, nickel coatings were fabricated by cold spray process followed by heat treatment in inert gas. Structural transformation of both as-sprayed and annealed coatings was investigated by Electron Backscattering Diffraction (EBSD) in a FEG-SEM. The results show that after cold spraying sub-micron grains and subgrains with high crystal strain appear in the particle bond interface, but not shown in the center of particles. Microstructure was transformed to be uniform and stresses were released after annealing in 400°C for one hour. And ductility and formability were significantly improved due to recovery and recrystallization. Continuous recrystallization after large strain deformation could occur after cold spraying followed by annealing.

Keywords

spray depositionpowder processingannealing
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1151: Symposium SS – Selecting and Qualifying New Materials for Use in Regulated Industries , 2008 , 1151-SS01-06
Copyright
Copyright © Materials Research Society 2009

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References

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