Browsing by Author "El Mahallawy, N"

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    Effect of solution treatment on the microstructure, tensile properties, and corrosion behavior of the Mg-5Sn-2Zn-0.1Mn alloy
    (IOP PUBLISHING LTD, 2018-01) Diaa, Alia A; Shoeib, M; Hammouda, R; El Mahallawy, N
    Working on magnesium alloys containing relatively inexpensive alloying elements such as tin, zinc, and manganese have been a target for many studies. The binary Mg-Sn and Mg-Zn systems have a wide range of solid solubility which make them heat-treatable alloys. In the present study, the microstructure, tensile properties, and corrosion behavior of the Mg-5Sn-2Zn-0.1Mn alloy was studied in the as cast state and after heat treatment at a temperature reaching 450 degrees C for about 24 h. It was found that a noticeable enhancement in strength and corrosion resistance was achieved through heat treatment. The strength of the as cast alloy increased from 76.24 +/- 6.21 MPa to 187.33 +/- 10.3 MPa, while the corrosion rate decreased from 1.129 to 0.399 mmy(-1).
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    Effect of Zn addition on the microstructure and mechanical properties of cast, rolled and extruded Mg-6Sn-xZn alloys
    (ELSEVIER SCIENCE SA, 2017) El Mahallawy, N; Diaa, A. Ahmed; Akdesir, M; Palkowski, Heinz
    Tin and zinc have great potential as alloying elements in magnesium alloys in which they have a wide range of solid solubility. In the present study, the microstructure and mechanical properties of Mg-6Sn-xZn (x=0, 2, and 4 wt%) were investigated and compared in cast/heat treated, rolled at 350 degrees C from 10 mm to 2 mm and extruded at 350 degrees C with a ratio 40:1. The alloy composition and the applied process affected the mechanical properties. The Young's modulus increased with increasing Zinc content up to 2% and reached a maximum value of 40 GPa for the Mg-6Sn-2Zn alloy. In the case of the cast/heat treated condition, the ultimate tensile strength (UTS) and elongation to rupture increased with the Zn content, reaching maximum values of 189.7 MPa and 7.15%, respectively, for the Mg-6Sn-4Zn alloy. The maximum strength of the alloys in the rolled conditions was achieved for Mg-6Sn-4Zn alloy with a value of 253 MPa with 12.32% elongation while in the extruded conditions the Mg-6Sn-4%Zn alloy exhibited a maximum combination of strength and elongation of 276.33 MPa and 23.1%, respectively. The results are discussed with respect to the microstructure evolution, grain size and precipitates in the alloys.