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Examples of alloy AZ6NF castings.
The structure was examined in optical (OM, Axiovert 200 MMAT), transmission electron (TEM, JEM-2100), and scanning electron (SEM, JSM-6610LV) microscopes. Polished samples were cut from the central part of the castings and studied. Electrolytic polishing was made using 12 VDC in an electrolyte containing 6 parts of ethanol, 1 part of HClO4 , and 1 part of glycerine. Thin foils for TEM were prepared by electrolytic thinning (in a perchloric acid-alcohol solution) and studied at 160 kV. The mechanical properties (ultimate tensile strength – UTS, yield strength – YS, and relative elongation – El