Influence of cerium on the microstructure and mechanical properties of ZA104 and ZA104 + 0.3Ca magnesium alloys

The influence of cerium addition on tensile and creep properties of ZA104 and ZA104 + 0.3Ca magnesium alloys containing between 0 wt.% and 3.5 wt.% Ce were evaluated and compared to those of AZ91D alloy. It was shown that cerium slightly decreases the ductility but increases the yield strength of ZA104 alloy. The influence of cerium on room temperature properties remains modest for concentration up to 2.6 wt.% in ZA104 + 0.3Ca alloy. The creep strength of the ZA104 alloy is clearly improved by the addition of a minor amount of cerium. But this effect is much less pronounced for ZA104 + 0.3Ca alloy. Variations of the properties of alloys were discussed considering the presence of two new intermetallic phases (Al5Zn3Ce2 and Al6Zn2Ce2) in the microstructure and also the reactions that occurred during solidification.

Research highlights▶ Two new cerium-rich phases were identified (Al5Zn3Ce2 and Al6Zn2Ce2). ▶ Phase morphologies were characterized. ▶ Microhardness of phases was determined. ▶ Cerium improves YS and creep resistance at 175 °C.