Arteleo Chemistry Journal

Casting Xx Alloys Containing Magnesium And Manganese

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Casting alloys of the A1 Mg-Si system are discussed in Chapter 2, here we only consider the effect of Mn on solidification paths in A356.0-type alloys. The main implication of Mn on the sequence of solidification in this type of alloys is the occurrence of two eutectic reactions with the formation of the Al15(FeMn)3Si2 phase. The amount of this phase is larger at higher cooling rates.

Backerud et al. (1990) suggested schematic solidification paths that are relevant to A356-type alloys with and without manganese. These diagrams are given in Figure 4.12.

Table 4.11 summarizes the effects of composition and cooling rate on solidification reactions in two A356.0-type alloys.

Figure 4.12. Diagrams of solidification paths for two A356-type alloys containing 6.7-6.8% Si, 0.30-0.35% Mg and (a) 0.08% Fe, 0.0% Mn and (b) 0.44% Fe, 0.30% Mn (after Backerud et al., 1990). Numbers on lines correspond to solidification reactions in Table 4.11.