Effect of Solidification Rate and Rare Earth Metal Addition on the Microstructural Characteristics and Porosity Formation in A356 Alloy

Figure 15

(a, b) Backscattered electron images showing porosity in Sr-modified A356 alloy samples containing (a) 0.8% La and (b) 1.025% La; note the presence of thick oxide films (white arrows) (sample SDAS ~ 42 μm). (c, d) X-ray images showing the distribution of (c) oxygen and (d) strontium in (b).

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(b)

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