Özet:

Influence of a number of alloying elements (Nd, Ge, Si, Y, Sc, Zr, Ti and Hf) on structure formation, room-temperature mechanical properties and high-temperature strength of МL5 magnesium alloy have been studied. Influence of the alloying elements on a shape and size of intermetallic compounds has been established. A quantitative and qualitative analysis of the intermetallic phase in additionally alloyed МL5 have been made, its influence on the structure, room-temperature mechanical properties and high-temperature strength of magnesium castings has been investigated. Influence of morphological and topological features of the structure constituents of the magnesium alloys on their properties has been established. It was shown that micro alloying of the magnesium alloys within a range of 0.05–0.1 % wt. results in an increase of the intermetallic compound volume percent by ~ 1.5 times, reducing their size with simultaneous formation of spherical intermetallic compounds located in the grain centre and serving as additional solidification nuclei. It was found out that at the volume fraction of the intermetallic compounds within a range of 0.35…0.45 % a maximum ductility of the magnesium alloy is attained. Further increase of the intermetallic compound amount leads to decrease in the ductility due to their excessive precipitation and greater strengthening of the metal.Introduction of the studied magnesium alloys ensures a higher level of room-temperature mechanical properties and a high-temperature strength of the castings that makes them a good candidate material to be used in newly developed machines and assemblies. Author Biographies Vadim Shalomeev, Zaporozhye National Technical University Zhukovsky str., 64, Zaporozhye, Ukraine, 69063 Doctor of Technical Sciences, Professor Department of Physical Material Science  

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