Nickel‐aluminum‐bronze/Al2O3 surface nanocomposite produced by friction‐stir processing: Corrosion properties and microstructure

In this research, friction stir processing (FSP) was applied for fabricating nanosized particles of Al2O3 as a surface composite layer on nickel‐aluminum bronze alloy. In addition, the effect of nanosized Al2O3 on the microstructure, hardness, and corrosion resistance of the alloy surface was invest...

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Bibliographic Details
Published in:Materials and corrosion 2017-08, Vol.68 (8), p.883-891
Main Authors: Abbasi‐Khazaei, B., Keshavarz, S.
Format: Article
Language:English
Subjects:
Al2O3
Aluminum bronzes
Aluminum oxide
corrosion
Corrosion effects
Corrosion resistant alloys
Crystallization
Deformation resistance
Friction resistance
Friction stir processing
FSP
hardness
Immersion tests (corrosion)
Microstructure
NAB
Nanocomposites
Nanoparticles
nano‐composite
Nickel base alloys
Particulate composites
Plastic deformation
Scanning electron microscopy
Studies
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Summary:In this research, friction stir processing (FSP) was applied for fabricating nanosized particles of Al2O3 as a surface composite layer on nickel‐aluminum bronze alloy. In addition, the effect of nanosized Al2O3 on the microstructure, hardness, and corrosion resistance of the alloy surface was investigated. To study the microstructure of the FSP treated surface, optical and scanning electron microscopy were used. Moreover, the static immersion and electrochemically corrosion tests were employed to investigate the corrosion resistance of the FSP‐treated surface. The results indicated that using nanoparticles of Al2O3 to produce the surface nanocomposite layer led to fewer amounts of β transformation products. Furthermore, dynamic re‐crystallized sub‐grains were formed in α grains in the stir zone during severe plastic deformation. In addition, a significant improvement in the corrosion resistance of the alloy surface was observed in the friction stir processed nanocomposite sample in comparison to the one without nanoparticles. Friction stir processing was applied for fabricating nanosized particles of Al2O3 as a surface composite layer on nickel‐aluminum bronze alloy. In addition, the effect of nanosized Al2O3 on the microstructure, hardness, and corrosion resistance of the alloy surface was investigated. Significant improvement in the corrosion resistance of the alloy surface was observed in the friction stir processed nanocomposite sample.
ISSN:0947-5117
1521-4176
DOI:10.1002/maco.201609369