Based on the microstructure of VW103(Mg-10Gd-3Y)and VW63(Mg-6Gd-3Y)cast magnesium alloys,the work aims to investigate and analyze the differences in mechanical properties and obtain the casting properties and mechanical properties of the two magnesium alloys in engineering applications.The solidification temperature range and casting crack ten-dency of two types of alloys were studied by the methods such as thermal analysis and improved crack ring specimens.The so-lidification temperature range,liquid fluidity,and crack resistance of the materials in both hot and cold states were measured and analyzed to obtain the casting characteristics of Mg-Gd-Y rare earth cast magnesium alloy.Based on sampling results from dif-ferent areas of the component body,the mechanical properties of Mg-Gd-Y alloy at room temperature and 150℃were obtained,and the load-bearing capacity and stability of the overall casting structure were evaluated.In terms of casting properties,during hot demolding,neither VW103 nor VW63 alloy showed cracking phenomenon.For demolding in the cold state,the VW103 al-loy sample cracked.In terms of mechanical properties,compared with VW103 alloy,VW63 alloy had better comprehensive mechanical properties.The average tensile performance of VW63 alloy casting specimens under high temperature conditions of 150℃was 320 MPa,demonstrating excellent mechanical properties.VW63 alloy has better mechanical and casting properties.The integral castings prepared by VW63 alloy and resin sand anti gravity method meet the requirements of structural bearing capacity.During the testing process,the displacement(deformation)of the castings shows a good linear relationship with the load and loading time,confirming the safety and reliability of VW63 castings,which can provide reference for the subsequent application of VW63 alloy.
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