Effects of Addition of Yttrium on the Microstructure, Compression Properties and Corrosion Resistance of Injection Molding AZ91D-1.6Ca Magnesium Alloy

In this work, the new injection molding device was designed to simulate the process of squeeze-casting. The effect of different Y additions on the compressive properties and corrosion resistance of AZ91D-1.6 Ca alloy was studied. The results proved that the addition of Y further refined the microstructure of the alloy. At the same time, with the addition of Y, the new Al2Y phase appeared in the microstructure. The compressive strength of the alloy increases first and then decreases with the addition of Y, and the maximum compressive strength of 372 MPa was obtained when Y content reaches 1.2 wt%. The corrosion resistance of the alloy was improved after adding the appropriate amount of Y. In general, the mechanical properties of the samples prepared by injection molding are equivalent to those of squeeze-casting samples, which can effectively simulate the squeeze-casting process in the laboratory environment for alloy design. Adding an appropriate amount of Y element can improve the alloy. At the same time, it shows that the combined addition of Ca and Y can improve the compression property and corrosion resistance of the material within a certain composition range.