Abstract
Zn–1.0wt.%Cu (monophasic) and Zn–2.2wt.%Cu (hypoperitectic) alloys were investigated by transient directional solidification, and the results include the cell spacing (λc) and correlation with the experimental tip cooling rate (T˙), macrosegregation, microhardness (HV) and the qualitative variation on η and ε phases by XRD spectra. Only regions very close to the cooled casting surface of the Zn–2.2wt.%Cu alloy casting, showed plate-like cells due to very high cooling rates (>16K/s) associated with a significant Cu enrichment. The Zn–2.2wt.%Cu alloy exhibited HV values 2–3 times higher than those found for the Zn–1.0wt.%Cu alloy. It is shown that the microhardness of the Zn–2.2wt.%Cu alloy is directly influenced by both the inverse Cu segregation and by the morphologies of η and ε phases. Modified Hall–Petch equations are proposed relating HV to λc for both alloys.
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