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    Investigation of microstructure, mechanical properties and corrosion behaviour of As-cast Mg-4Sn-2Al-X (X=0.5 Ca and 0.25 Mn) alloys
    (Springer Science and Business Media Deutschland GmbH, 2025) Kurt, Penbe; Kurnaz, Şehnaz Can
    In this study, 0.5 wt. % of Ca, and 0.25 wt. % Mn was added to Mg-4Sn-2Al alloy, and its mechanical and corrosion properties were investigated. Production was carried out by gravity casting under a controlled atmosphere. Microstructures were investigated using SEM/EDS and XRD. In addition to the microstructure, the effects of alloying element addition on tensile properties, hardness, fracture surfaces, strain hardening exponent, anisotropy coefficients, corrosion microstructures, and corrosion rates were also investigated. According to the results obtained, Mg–4Sn–2Al–0.5Ca, and Mg–4Sn–2Al–0.25Mn alloys showed lower mechanical properties than Mg–4Sn–2Al alloys. While the ultimate tensile strength was 131 MPa for the Mg-4Sn-2Al alloy, this value decreased to 92.5 MPa with the addition of Ca, and to 102 MPa for the Mg-4Sn-2Al–0.25Mn alloy. Also, the strain hardening coefficient for Mg-4Sn-2Al alloy was 0.35, while it decreased to 0.28 with the addition of Ca. With the addition of Mn, it gave a value of 0.36, which is almost the same as Mg-4Sn-2Al alloy. When the anisotropy coefficients are examined, the anisotropy coefficient of Mg-4Sn-2Al alloy, which was 0.83, increased to 0.872 with the addition of Ca, and 1.293 with the addition of Mn. According to the results obtained from potentiodynamic and immersion corrosion tests, the Mn doped alloy showed the highest corrosion resistance in both tests. The corrosion rate of the Mn doped alloy was 18.96 mpy according to potentiodynamic results and 65.32 mpy according to immersion test results.
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    Investigation of the effect of la and ti addition to Mg-4Sn-2Al alloy on microstructure, mechanical and corrosion properties
    (Springer Science and Business Media Deutschland GmbH, 2023) Kurt, Penbe; Kurnaz, Süleyman Can
    In this study, Mg-4Sn-2Al alloy by weight was produced by gravity casting under a controlled atmosphere. The effect of alloying elements added to this alloy on microstructure, mechanical, and corrosion properties was investigated. Alloying elements were chosen as 2% La, and 0.15% Ti by weight. During the research, SEM/EDS, XRD, tensile, % elongation, hardness, hardening exponent, anisotropy coefficients, fracture surfaces, corrosion rates, and corrosion microstructures of the alloys were investigated. According to the results obtained, Mg-4Sn-2Al-2La and Mg-4Sn-2Al-0.15Ti alloys showed higher mechanical properties compared to Mg-4Sn-2Al alloy. While the ultimate tensile strength for Mg-4Sn-2Al alloy was 131 MPa, it increased to 159 MPa for Mg-4Sn-2Al-2La alloy and 163 MPa for Mg-4Sn-2Al-0.15Ti alloy. At the same time, the strain hardening exponent and anisotropy coefficients of Mg-4Sn-2Al alloy increased with the addition of La and Ti. This shows that the formability of the alloy is improved. In addition, there was not much difference in the hardness values of the alloys. At corrosion rates, the lowest corrosion rate was 11.68 mpy in Mg-4Sn-2Al-0.15Ti alloy, 29.69 mpy in Mg-4Sn-2Al-2La alloy and the highest corrosion rate was 46.60 mpy in Mg-4Sn-2Al alloy. The addition of La and Ti decreased the corrosion rate of Mg-4Sn-2Al alloy.