Effect of Zn and Y on microstructures and properties of normally-solidified Mg-Zn-Y alloys
WANG Feng
MA De-zhi
WANG Zhi
LIU Zheng
MAO Ping-li
Abstract：In order to obtain a high-quality quasicrystal alloy with icosahedron quasicrystal phase, the Mg-Zn-Y alloys were prepared with the permanent mold casting method. The influence of Zn and Y elements on the microstructures and properties of the alloys were investigated with scanning electron microscope ( SEM ) , energy dispersive spectrometer ( EDS ) , X ray diffractometer ( XRD ) and Vickers hardness tester, and the forming mechanism of quasicrystal phase was analyzed. The results show that the quasicrystal phase can nucleate and grow directly from the liquid phase under the condition of normal solidification. In addition, the hardness of the alloys as well as the morphology, size and distribution of quasicrystal phase are closely related to the content of Zn and Y elements. With increasing the Zn content, the hardness of Mg-xZn-4. 5Y alloys gradually increases. The quasicrystal phase changes from the petal-like shape to strip shape, and the lamellar eutectic and α-Mg phase gradually disappear. With increasing Y content, the hardness of Mg-48Zn-yY alloys gradually increases. The amount of petal-like quasicrystal phase increases, and the lamellar eutectic becomes more compact. The high-quality quasicrystal alloy Mg-48Zn-13Y can be obtained through adjusting the Zn and Y contents.
Keywords：Mg-Zn-Y alloyrare earthsolidificationicosahedronquasicrystalhardnessmicrostructuremechanical property
Publication Date：2017-09-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 501-506 )