The microstructure,mechanical properties and damping capacity of ZK60-xY（x=0,1.5%,2.5%,4.0%,mass fraction） magnesium alloys were investigated by using the optical microscope（OM）,X-ray diffractometer（XRD）,universal tensile testing machine and dynamic mechanical analyzer（DMA）.The mechanisms for damping capacity of referred alloys were discussed by Granato-Lücke theory.The results show that Y additions remarkably reduce grain size（the average grain size is 21.6,13.0,8.6 and 4.0μm,respectively）,and the tensile properties are enhanced with grain refining（the yield tensile strength increases to 292 MPa from 210 MPa and ultimate tensile strength increases to 330 MPa from 315 MPa）.For the ZK60-xY（x=0,1.5%,4.0%）alloys,the damping capacity decreases with the increase of Y content.However,for the ZK60-xY（x=2.5%）alloy,the damping capacity improves abnormally,which is possibly related to the formation of Mg3Y2Zn3（W）FCC phase in this alloy.
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