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Microstructures and tensile properties of as‐cast and as‐extruded AZ91 magnesium alloys with individual and combined additions of Ca, Sm, and La elements are investigated. The results show that Al2Ca, Al2Sm, and Al11La3 new phases form after adding Ca, Sm, La elements, decreasing the amount of Mg17Al12 phases and refining the microstructures. Microstructures of as‐cast and as‐extruded alloys with...