20 / 41
Materials Congress 2018
Page 66
Nano Research & Applications
ISSN: 2471-9838
W o r l d C o n g r e s s o n
Materials Science & Engineering
A u g u s t 2 3 - 2 5 , 2 0 1 8
Am s t e r d a m , N e t h e r l a n d s
F
e-based amorphous feedstock powders used as the matrix into which various ratios of hard B
4
C 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 B
4
C nanoparticles with a scale of 10–50 nm in a residual amorphous
matrix. As the B
4
C content increases, the nanohardness of the composite coatings increases, but the fracture toughness begins
to decrease at the B
4
C content higher than 20 vol%. The optimal mechanical properties are obtained with 15 vol% B
4
C 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 B
4
C nanoparticles
.
b.movahedi@ast.ui.ac.irMechanical investigation approach to optimize
the HVOF Fe-based amorphous coatings reinforced
by B4C nanoparticles
Behrooz Movahedi
University of Isfahan, Iran
Nano Res Appl 2018, Volume: 4
DOI: 10.21767/2471-9838-C4-018