1 results listed
Under different heat treatment kinds and conditions T4 (solution treatment) and T6 (aging treatment), whereas the
heat treatment is one of an active ways to improve performance. If it is possible to combine the alloying and aging
treatment correctly, thus, the performance of magnesium alloys can be more developed. In addition several studies
have shown that alloying is a beneficial way to improve the performance of magnesium alloys where refining
structures have been widely recognized, enhanced solid solution and enhanced dispersion. [1, 2] and alloys are
created in engineering applications by adding a number of different elements such as Al, Zn, Mn, to improve the
strength , corrosion resistance and other properties of magnesium. Zinc (Zn) is one of the elements that is used
effectively in the alloying of magnesium. In this study the experimental method included the addition of 99.9%
pure Mg and Zinc element for the production of magnesium alloys were carried out. Analyzes of the obtained
alloys were made at X –Ray Fluorescence (XRF).
The materials used in this study were ingots of Mg alloys containing MgxZn (x= 0.5,1, wt.% Zn). Several tests
were performed, including microstructure analysis of samples before and after heat treatment including T4
(solution treatment) for the homogenization heat treatment, the temperature of the furnace was chosen as 400 ° C,
at this temperature, the material was left for 24 hours and then cooled in water. T6 (aging treatment) was done for
the application of aging heat treatment, 2 different hours were selected at 200 ° C (8 and 16hours). After aging,
the material was allowed to cool at room temperature. The electrochemical test of corrosion was also done for
samples with a diameter of 17 mm and a surface area 2.26 cm2 which exposed to electrolyte. Experiments were
performed at room temperature in a glass cell containing 3.5% NaCl solution. Potentiodynamic polarization curves
were generated by sweeping the potential from cathodic to anodic direction at a scan rate of 1 mV s−1, starting
from -0.5 V up to 0.5 V, versus OCP.
Vickers hardness, corrosion behaviors and optical microscope investigations of MgxZn (x= 0.5, 1 wt.% Zn) of
magnesium alloys were performed in this study. Microstructure studies have shown that the grain boundaries are
larger before heat treatment and grain structures are finer after heat treatment. The grain size of the alloys decreased
with the increasing of zinc content. Zinc element enriches along grain boundaries to display a network
microstructure for both T4 and T6-treated alloy. The grain refinement effect of a solid solute element can be
determined by calculating the grain growth limiting factor (GRF). In the literature [3], the Zn element has a higher
GRF than the Al (4,32) and Y (1,70) GRF values of 5,31 GRF, has a growth-limiting effect, which means that the
grain-thinning effect is high.
International Symposium on Light Alloys and Composite Materials
UHAKS
Erkan Koç
Fozi Mustafa Salem Makhlof