Study on the Microstructure and Properties of Mg-Gd-Y-Sm-X-Zr(X=La,Ce,Sr,Sb)Alloys
Mg-Gd-Y-Sm-X-Zr(X=La,Ce,Sr,Sb)alloys were prepared using pure magnesium and magne-sium-based intermediate alloys as raw materials.The instruments of Vickers hardness tester,inductively coupled plasma atomic emission spectrometer,metallographic microscope,scanning electron microscope and tensile testing machine were used to test the sample.The Vickers hardness of solid solution-aged Mg-Gd-Y-Sm-X-Zr(X=La,Ce,Sr,Sb)alloys was studied firstly.The influence of rare earth element Gd and Y content on the Vickers hardness of aged Mg-Gd-Y-Sm-La-Zr alloy was also studied.And then the micro-structure,aging hardening characteristics,and mechanical properties of as-cast and solid solution-aged Mg-8Gd-3Y-2Sm-0.15La-0.5Zr alloy were further studied.The results indicate that La is the optimal streng-thening element.The Vickers hardness of the alloy with Gd/Y mass ratio of 8/3 is better than that of the alloy with Gd/Y mass ratio of 6/4 and 9/2.The grain size of as-cast Mg-8Gd-3Y-2Sm-0.15La-0.5Zr alloy is mainly concentrated in the range of 20～45 μm,and its peak hardness of 132.87 HV is reached after 16 h aging.The tensile strength and yield strength of the aged alloy are 259.02 MPa and 240.31 MPa respec-tively,increased by 42.32％and 51.87％compared with the as-cast alloy respectively.
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