SCANNING EXAMINATIONS OF MAGNESIUM- AND LITHIUMBASED ALLOYS OF TWO-PHASE α-β AND MONOPHASE β STRUCTURE

The study presents the results of examinations carried out on ultra-light magnesium- and lithiumbased alloys of two-phase α-β structure and monophase β structure using scanning electron microscopy with chemical analysis in microregions (SEM + EDX - Philips XL30 + EDAX) and X-ray phase analysis (XRD - X-ray diffractometer model D8 Advance, Bruker). The diffraction reflexes were interpreted from a PDF-2 catalogue. It was observed that the addition of alloying elements (calcium or aluminium) definitely changes the structure of monophase Mg-Li α or β alloys. Calcium addition to a cast binary Mg-Li-Ca alloy results in the formation of two-phase structure composed of β phase dendrites, lamellar CaMg2 eutectic, and probably α phase. The addition of aluminium to a cast binary alloy from the Mg-Li-Al system results in the formation of a two-phase α and β system. The Mg-18,4%Li-1,2%Zn alloy is a monophase β structure material with zinc dissolved in alloy matrix.

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