2 results listed
Nano composite coatings are a new forms of materials
containing hard phase particles to enhance the hardness and wear
resistance, among which diamond in terms of feasibility and cost,
is the best combination for chromium. In this study, electrolytic
coating of pure chromium and Cr-ND (nano diamond) composite
coatings were applied on pre-alloy metal powder metallurgy
specimens. The effects of the ND particles on tribological behavior
of the chromium coatings were investigated. Characterization
tests were carried out using an optical microscope, SEM, EDS,
XRD and AFM. The dry sliding wear behavior of the specimens
was carried out using pin on plate configuration. The hardness
and wear resistance of the Cr-ND coated samples were compared
with pure chromium coated and non-coated specimens. The
results demonstrated that the embedding of the ND particles in the
chromium matrix led to a significant improvement on the
hardness and wear behavior of the Cr-ND coatings than pure
chromium coatings and non-coated specimens.
International Iron & Steel Symposium
UDCS
N. Zoghipour
E. Salamci
Rahmi Ünal
N. Gidikova*
R. Valov
V. Petkov
Because Al-Sc alloys are used extensively in the industry due to their many properties, both theoretical
and experimental researchers are interested. The importance to these alloys is the physical and chemical properties
they exhibit at lower proportions of Sc additives. We also obtained Al-1.1Sc and Al-1.9Sc alloys using a special
method. By doing XRD analyzes at room temperature, we reached the conclusion that both alloys crystallized in
the same 225 space group and fcc structure. We calculated the second-order elastic constants using the knitting
parameters obtained from the EMTO program. In this study, by using XRD test results and theoretical calculation
results; (hkl) in the crystal planes defined by Miller indices; peak widths, crystal dimensions, dislocation densities,
Young's constants and Maximum Stresses were examined separately. It is seen that the physical parameters (hkl)
change according to their planes in the result of the study done. In particular, the maximum stress and Young's
modulus were found to be mechanically better for the strength of the Al-1.1Sc alloy.
International Symposium on Light Alloys and Composite Materials
UHAKS
Hamza Yaşar Ocak
Rahmi Ünal
Gencer Sarıoğlu
Şule Uğur
Gökay Uğur