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The microstructure of a casting Zn-40 wt pct Al alloy was studied by transmission electron microscopy (TEM). The results show that primary α’ dendrites decompose into η-Zn phases and an aluminum matrix during cooling and at ambient aging. There are three typical morphologies corresponding to the different microcompositions or cooling conditions: coherent platelike η-Zn phases, spherical η-Zn phases...
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