Abstract
The paper presents results of TEM investigations of Elektron 21 magnesium alloy in as cast condition and after long-term annealing. Elektron 21 is magnesium based casting alloy containing rare earth (Nd and Gd) for used to at 200°C in aerospace application. It has high strength, good corrosion resistance and excellent castability [1]. Magnesium alloys containing neodymium and gadolinium are characterised by high-strength and good creep-resistant alloys for automotive and aerospace applications [2,3]. The rare earth elements have beneficial effect of on the creep properties and thermal stability of structure and mechanical properties of magnesium alloys [4]. The strength of magnesium alloys with RE is achieved essentially via precipitation strengthening. These alloys precipitate from the solid solution according to the sequence of phases: α-Mg→β”→α’ →β [5].
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