Kun Vanna Yang, Mark A. Easton and Carlos H. Cáceres The Effect of Solidification Dynamics on the Formation of the Skin in Die Cast Mg–Al and Mg–RE Alloys Advanced Engineering Materials 15
The Mg–La alloy evolves more solid for given temperature drop than the Mg–Al alloys, i.e., the incipient grain microstructure (black) forms a better-defined solid front in the Mg–RE alloy. The large (red) crystals pre-solidified in the shot-sleeve find it more difficult to reach the surface in the Mg-RE alloy than those facing the more mushy solidification front of the Mg–Al alloys. A more distinct skin layer in the Mg–La alloy results.
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