Microstructure and Mechanical Properties of Ce Modified Cast AZ61 Magnesium Alloy for Automobile
The modification casting test of AZ61 magnesium alloy with different Ce addition was carried out.The effects of Ce modification on the microstructure and mechanical properties of AZ61 magnesium alloy were studied by OM,hardness test and tensile test.The results show that the microstructure of as cast AZ61 magnesium alloy without modification is composed of α-Mg phase and coarse network β-Mg17Al12 phase composition.With the increase of Ce addition,the precipitation amount of β-Mg17Al12 phase in AZ61 magnesium alloy gradually decreases,and gradually changes from continuous coarse reticulate to granular,and the rare earth phase gradually increases.β-Mg17Al12 phase is the smallest in AZ61 magnesium alloy with Ce content of 1.0wt%.Compared with that of unmodified AZ61 magnesium alloy,the hardness,tensile strength and elongation of Ce modified AZ61 magnesium alloy are obviously improved.The hardness,tensile strength and elongation of AZ61 magnesium alloy increase first and then decrease with the increase of Ce content,and AZ61 magnesium alloy with 1.0wt%Ce addition has the best mechanical properties.
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