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Gas Pore Formation in Lost Foam Casting of AZ91H Mg Alloy in Comparison with A356 Al Alloy

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Figure

Fig. 2(a) The shape of the Test Casting-T manufactured by lost foamcasting (unit:mm); (a) dimension of casting; (b)–(g) shape of each castingfor AZ91H alloy under various casting conditions.
Fig. 4(a) The pseudo hydrogen solubility diagram of AZ91H alloycompared with that of A356 alloy; below table shows the measuredhydrogen concentration for AZ91H alloy and A356 alloy by reducedpressure test and the expected real hydrogen concentration in the melts forboth alloys, (b–e) photographs showing the polished surfaces of reducedpressure test samples; (b–c) AZ91H alloy and (d–e) A356 alloy.
Fig. 6Macrostructures in channel tip of 11 mm-thick legs; (a–c) A356 and(d–f) AZ91H alloys.
Fig. 9(a–b) SEM images showing the oxide film thickness for A356 andAZ91H alloy in LFC, (c–h) photographs showing the filling behavior ofAZ91H Mg alloy in test casting-L, (i–l) photographs showing the surfacemorphologies after test casting-L for A356 and AZ91H alloys.
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