Premium
Nickel‐aluminum‐bronze/Al 2 O 3 surface nanocomposite produced by friction‐stir processing: Corrosion properties and microstructure
Author(s) -
AbbasiKhazaei B.,
Keshavarz S.
Publication year - 2017
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201609369
Subject(s) - friction stir processing , materials science , microstructure , corrosion , alloy , metallurgy , nanocomposite , scanning electron microscope , aluminium , transmission electron microscopy , bronze , nanoparticle , nickel , composite material , nanotechnology
In this research, friction stir processing (FSP) was applied for fabricating nanosized particles of Al 2 O 3 as a surface composite layer on nickel‐aluminum bronze alloy. In addition, the effect of nanosized Al 2 O 3 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 Al 2 O 3 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.