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Nano Research & Applications
ISSN 2471-9838
E u r o S c i C o n C o n f e r e n c e o n
Nanotechnology &
Smart Materials
O c t o b e r 0 4 - 0 6 , 2 0 1 8
Am s t e r d a m , N e t h e r l a n d s
Nanotechnology & Smart Materials 2018
Mechanical investigation approach to optimize the HVOF Fe-based
amorphous coatings reinforced by B4C nanoparticles
Behrooz Movahedi
University of Isfahan, Iran
F
e-based amorphous feedstock powders used as the matrix into which various ratios of hard B4C nanoparticles (0, 5, 10, 15, 20
vol %) as a reinforcing agent were prepared using a planetary high-energy mechanical milling. The ball-milled nanocomposite
feedstock powders were also sprayed by means of high-velocity oxygen fuel (HVOF) technique. The characteristics of the
powder particles and the prepared coating depending on their microstructures and nanohardness were examined in detail using
nanoindentation tester. The results showed that the formation of the Fe-based amorphous phase was noticed over the course
of high-energy ball milling. It is interesting to note that the nanocomposite coating is divided into two regions, namely, a full
amorphous phase region and homogeneous dispersion of B4C nanoparticles with a scale of 10-50 nm in a residual amorphous
matrix. As the B4C content increases, the nanohardness of the composite coatings increases, but the fracture toughness begins
to decrease at the B4C content higher than 20 vol %. The optimal mechanical properties are obtained with 15 vol % B4C due to the
suitable content and uniform distribution of nanoparticles. Consequently, the changes in mechanical properties of the coatings
were attributed to the changes in the brittle to ductile transition by adding B4C nanoparticles.
b.movahedi@ast.ui.ac.irNano Res Appl Volume:4
DOI: 10.21767/2471-9838-C6-025