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    Ca and Ce Effect on the Corrosion Resistance of Hot-Rolled AZ31 Mg Alloys
    (Eos Assoc, 2020) Kara, Ismail Hakki; Yousef, Taher Ali Issa; Ahlatci, Hayrettin; Turen, Yunus
    In this study, AZ31 Mg alloys with added Ca and Ce were produced by low pressure die casting and were rolled at 400 degrees C. The corrosion properties of the materials were determined by immersion test for 72 hours at a 3.5% NaCl solution. The microstructure of the samples was investigated by light optical microscopy (LOM) and scanning electron microscopy (SEM) before the corrosion test. Twins, dynamic recrystallization (DRX), and the alloying elements have an important role in imparting the final corrosion resistance of the investigated materials.
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    EFFECT OF ADDING REARE EARTH ELEMENTS TO Mg-Ca BASE ALLOY ON CORROSION AND MECHANICAL BEHAVIOUR
    (2021-07) Yousef, Taher Ali Issa
    Todays, light weight structure materials are the most important issue for the automotive and aerospace industry because of the rising environment problems such as CO2 emission and efficient of energy consumption. (Mg) alloys can be the best alternative metallic materials which has both lower density and higher weight per density value than steel and aluminum. However, the main challenge of Mg material is the manufacturing process containing higher melting temperature than the its rival metals and extreme formability behavior due to the hexagonal structure. In this study, AZ31 and modified AZ31-x% (wt.) Ca, AZ31-x% (wt.) Ca-Ce alloys are produced. Homogenization was carried out at 400 °C for 24 hours after casting. Afterwards, slabs were removed from the homogenized logs to be 12x36x100mm. The slabs with an initial wall thickness of 12 mm were rolled at three different 1.5 m/min, 4.7 m/min and 10 m/min rolling speeds at 400 °C for each deformation rate with 15% deformation rate per pass. Optical microscope, SEM and XRD examinations of homogenized materials were performed to determine the relationship between rolling capacity and microstructure. The microstructure of sheet materials that pass the rolling process and have a wall thickness of 2 mm was examined by optical microscope, SEM and the strength of the macro texture was measured using XRD. Besides, macro-hardness from mechanical tests test (HB) and tensile test at room temperature. In addition, potentio-dynamic and immersion corrosion tests were carried out in the 3.5% NaCl medium of the sheet material. In addition, abrasion tests were carried out at room temperature in a forward and backward direction in a dry environment. It has been observed that deformation amount per pass and different rolling speeds cause differences in grain size, twinning fraction and dispersion and size of sediments. The effects of the addition of alloying elements and microstructure properties on mechanical properties, corrosion resistance and wear behavior are examined.