“…In the source literature, authors took up the subject of dynamic viscosity of magnesium alloys (Ref 23, 48-52); however, their results did not concern the systems with the addition of rare earth elements. What is more, authors usually examined the rheological phenomenon of semi-solid slurries of alloys ( Ref 23,[48][49][50][51][52]. At the same time, the rheological behavior, i.e., thixotropy of the tested AZ91 alloy, was analyzed in a slightly different way, by studying the rest time and subjecting the system to the impact of forces, instead of gradual change of the shear rate (Ref 48, 49).…”