- TITLE:
SURFACE EFFECTS OF PLATINUM NANOWIRE UNDER UNIAXIAL TENSILE LOADING: A MOLECULAR DYNAMICS SIMULATION STUDY
- AUTHOR(S):
V. Guder
- ABSTRACT:
The mechanism of the tensile deformation of face centered cubic platinum nanowires was
investigated by molecular dynamics simulation in which the interactions are expressed by the
embedded atom method potential. The two different thicknesses (1.9 nm and 9.8 nm) of nanowires
were used to understand the role of surface effects on the mechanical properties of platinum
nanowires. The yield stress and strain values were determined by the elastic recovery test which was
performed for both nanowires. For 9.8 nm platinum nanowire, the average stress has been governed
by core atoms while the surface atoms are more effective to define the mechanical properties of the
1.9 nm platinum nanowire
- PAGES:
68-
- TITLE:
THE INFLUENCE OF VOLTAGE AND ANODE JACKETS ON THE MICROSTRUCTURE, MICROROUGHNESS AND MICROHARDNESS OF COBALT COATINGS DEPOSITED ON Ti-6Al-4V USING BRUSH PLATING
- AUTHOR(S):
D. Veselinov
- ABSTRACT:
This paper presents preliminary results about the influence of the technological parameters –
voltage and anode jackets on the microstructure, microroughness, and microhardness of cobalt
coatings deposited on titanium alloy Ti-6Al-4V using brush plating. SEM and EDS analysis were
used to study the structure and morphology of the obtained coatings. It was found that the cover
material of the anode affects the microroughness of the coatings in the range from Ra = 0.028 μm to
Ra = 0.039 μm. Changing the voltage from 8V to 12V was found to affect the microhardness of the
coatings between 495 HV and 600 HV. Visual control and bend tests were performed to verify the
adhesion strength of the brush-plated cobalt coatings.
- PAGES:
63-
- TITLE:
THE INFLUENCE OF VOLTAGE AND ANODE JACKETS ON THE MICROSTRUCTURE, MICROROUGHNESS AND MICROHARDNESS OF COBALT COATINGS DEPOSITED ON Ti-6Al-4V USING BRUSH PLATING
- AUTHOR(S):
D. Veselinov
- ABSTRACT:
This paper presents preliminary results about the influence of the technological parameters –
voltage and anode jackets on the microstructure, microroughness, and microhardness of cobalt
coatings deposited on titanium alloy Ti-6Al-4V using brush plating. SEM and EDS analysis were
used to study the structure and morphology of the obtained coatings. It was found that the cover
material of the anode affects the microroughness of the coatings in the range from Ra = 0.028 μm to
Ra = 0.039 μm. Changing the voltage from 8V to 12V was found to affect the microhardness of the
coatings between 495 HV and 600 HV. Visual control and bend tests were performed to verify the
adhesion strength of the brush-plated cobalt coatings
- PAGES:
63-
- TITLE:
STUDY ON THE INFLUENCE OF THE TECHNOLOGICAL PARAMETERS OVER THE CORROSION BEHAVIOR AND SURFACE CHARACTERIZATION OF Ti-6Al-4V AND Ti-6Al-7Nb ALLOYS AFTER PLASMA GAS NITRIDING
- AUTHOR(S):
H. Skulev, D. Veselinov
- ABSTRACT:
Titanium and titanium alloys are very attractive materials because of their superior combination
of properties that enable their application in many industries. One of their biggest advantage is their
excellent corrosion resistance. Two commercial titanium alloys Ti-6Al-4V and Ti-6Al-7Nb have been
plasma gas nitrided with 20 kW power in a chamber with pure nitrogen atmosphere for 10 min to
improve their surface properties. Their corrosion behavior before and after surface treatment has
been studied using a weight loss method. Different media including 4.9M HCl, 0.5M NaCl, and 1.8M
H2SO4 have been used at different temperatures (20 ºC, 40 ºC, and 80 ºC), for various periods of time
to study the influence of the medium and temperature on the corrosion behavior of these materials.
The phase modifications and the microstructure of the nitrided layers have been analyzed using X-
ray diffraction and optical microscopy.
- PAGES:
59-
- TITLE:
A STUDY ON THE PREVENTION OF SURFACE DEFECTS CAUSED BY LUBRICATION IN PRODUCT PRODUCTION FROM ZAMAK 3 BY INJECTION METHOD
- AUTHOR(S):
C. Misirli, M. Ceviz, I. Çetintav, B. Ersoy
- ABSTRACT:
Due to its economic, easy formability, high corrosion resistance, excellent electrical conductivity
and low cost, Zamak-3 has a wide usage area in many sectors, especially accessories and fasteners
in the window and furniture sector, and spare parts in the automobile sector. For this reason, it is
important to prevent visual and functional defects caused by production. In this study, the
determination of the errors caused by lubrication in the production of zamak products by injection
method, the effect of the amount of lubrication on the surface defects, the relationship between
lubrication and mold design and the effects of all these problems on the quality of the products were
investigated. In this study, 1.2344 hot work tool steel was used as mold material and Zamak-3 as
product raw material. Different products were produced by changing the lubrication parameters in
the injection machine and application examples were examined. In line with this investigation, it is
planned to optimize the lubrication parameters.
- PAGES:
55-
