MAGNESIUM – TRENDS OF DEVELOPMENT OF MECHANICAL PROPERTIES

The work gives an overview on the actual status of the technology development of magnesium alloys. Interest in the magnesium alloys is still growing mainly because they combine good strength and low density. Article contains characteristics of fundamental magnesium alloys and review of main methods of influencing on their properties. First of all, ageing behaviour of magnesium alloys was analyzed. It has been shown, giving an example AZ91 alloy, that the heat treated magnesium alloys exhibit weaker strengthening effect compared to aluminum-base alloys. On the other hand, effect of the grain refining on strengthening in magnesium and magnesium alloys is much higher than that for aluminum alloys and for alloys of other metals. A paper contains a review of the recent works concerning the magnesium matrix composites. In particularly, a method of manufacturing magnesium-intermetallic phases layered macro-composite was presented. It was also shown that there exists possibility of significant modification of the microstructure and properties of the surface layer of magnesium using the laser treatment. Słowa kluczowe: magnez, stopy magnezu, umacnianie wydzieleniowe, warstwa wierzchnia

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