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In this study, the effect of RE content on the microstructure and creep properties of Mg-SAl-xRE (x = 0, 1, 2 or 3 mass%) alloys were investigated. The microstructural analysis and phase characterizations of Mg-8Al alloy with 1-3 mass% RE (La-rich Mischmetal) additions were conducted. (i) The as-extruded Mg-8Al-xRE alloys consisted of an α-Mg matrix, β(Mg 17 Al 12 ) and Al 11 RE 3 compounds. (ii) Raising the extent of RE in the alloy also increases the amount and coarsening of the Al 11 RE 3 compounds, but the amount of β phase diminishes and turns into the fine particles. The creep rupture life increment measured at 423 K is around 40-100 MPa, and the creep rupture life over 423 K is also prolonged. The marked improvement in high-temperature tensile creep properties is attributed to the fine rod-like A 11 RE 3 compound having high thermal stability in the alloys.

Creep Behavior of Extruded Sheets of Magnesium Alloys Containing La-Rich Mischmetal