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Role of Lanthanum in Grain Refinement and Tensile Properties of Cast Mg La Zr Alloys

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Figure

Fig. 2The superimposed values ( ) for Mg­La alloy in the graph of grainsize vs grain restriction factor 1/Q, reported by StJohn et al.10)
Fig. 4SEM micrographs in which (a) magnesium was sublimated from aMg­5.9La alloy exhibiting the interconnected skeletal structure of amagnesium­lanthanum compound and (b) lanthanum compound wasetched away from a Mg­2.1La alloy, leaving behind the skeletal structureof eutectic magnesium.
Fig. 7Difference in grain size of Mg­Zr alloys containing 0.4­0.5%soluble Zr solidified in various vessels
Fig. 10Backscattered SEM image of a Mg­Zr alloy solidified in a shell-mold right after stirring, exhibiting the round form of Zr-rich coring withan average grain size of 70 µm.7) Soluble zirconium content was 0.53%.
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