Matrix Microstructure


The primary α-Mg dendritic cells were quantified; Fig- ure 7 details the size distribution of cells taken from Lo- cations #1, 2, 4, and 6 in several different castings. As Figure 7 illustrates, the cell size is very fine and does


not significantly differ from the edge to the middle of the sample; in general, the average cell size in the edge region was 3.5 µm while that in the middle was 4.7 µm. Further, Figure 7 shows that there is no statistically sig- nificant difference in cell size based upon sample loca- tion within a casting.


(a)


(b)


(c)


(d)


Figure 6. Typical microstructural features observed in the AM50 HPDC castings: a) Microstructure; b) Porosity (red highlights); c) Externally Solidified Cells (purple highlights); d) Mg cells (blue highlights).


Figure 7. Magnesium cell size as a function of sample location and distance through the tensile specimen cross-section for the AM50 HPDC Casting. (Location as shown in Figure 1)


International Journal of Metalcasting/Winter 2012 21


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