Effects of Modifier Nd on Microstructure and Hardness of Mg-3Si-4Zn-xNd Alloy
Mg-3Si-4Zn-xNd magnesium alloys with different Nb contents were prepared by adding modifier Nd to Mg-3Si-4Zn magnesium alloy.By observing the microstructure changes of primary and eutectic Mg2Si,the influence of modifier Nd on the microstructure of Mg2Si was explored.Through the test,the effect of the change of Mg2Si phase on the hardness of the alloy was explored.The results show that the modifier Nd has a good effect on both the primary and eutectic Mg2Si.When the Nd content is 2.5%,the best metamorphic effect is obtained.The primary Mg2Si changes from a coarse dendritic structure with an average area of about 600 μm2(40 μm×15 μm)to a fine and irregular structure with an average area of about 139 μm2 polygonal bulk structure,eutectic Mg2Si changes from a complex Chinese character shape with an average area of about 444 μm2 to a simple Chinese character structure with an average area of about 145 μm2.The hardness of the alloy reaches the maximum value,increasing from 58.75 HV0.1 to 73.27 HV0.1,increasing by 24.7%.
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