Some Mechanical Properties of Experimental Mg-Al-RE-Mn Magnesium Alloys

The results of some mechanical properties of four Mg-5Al-xRE-0.4Mn (x=1–5) alloys are presented. The microstructure of experimental alloys consisted of an σ-Mg phase and an α+γ semi-divorced eutectic, Al₁₁ RE₃ phase and an Al₁₀ RE₂ Mn₇ intermetallic compound. For gravity casting in metal mould alloys, Brinell hardness, impact strength, tensile and compression properties at ambient temperature were determined. The performed mechanical tests allowed the author to determine the proportional influence of the mass fraction of rare earth elements in the alloys on their tensile strength, yield strength, compression strength and Brinell hardness. The impact strength of the alloys slightly decreases with a rise in the rare earth elements mass fraction.