Mg-Gd-Y合金及其构件的组织与性能研究

Structure and Properties of Mg-Gd-Y Alloy and Its Components

目的针对VW103(Mg-10Gd-3Y)和VW63(Mg-6Gd-3Y)2种铸造镁合金,从材料微观结构入手,探讨分析2种合金力学性能差异性,获取了2种镁合金在工程应用中的铸造性能及其力学特性。方法采用热分析法和改进的裂纹环试样等方法,开展2种合金的凝固温度范围和铸造裂纹倾向研究。测量和分析其凝固温度范围、液态流动性、热态和冷态下的材料抗裂性能,获得Mg-Gd-Y稀土铸造镁合金的铸造特性;基于构件本体不同区域取样,获得Mg-Gd-Y合金在室温和150℃下的力学性能,并对整体铸件结构的承载能力和稳定性进行评估。结果在铸造性能方面,热态下脱模,VW103和VW632种合金均未出现开裂现象;冷态下脱模,VW103合金试样出现开裂。在力学性能方面,与VW103合金相比,VW63合金具有更好的综合力学性能,VW63合金铸件本体试样在高温(150℃)条件下拉伸性能均值为320 MPa,表现出优异的力学性能。结论VW63合金具有更好的力学性能和铸造性能,采用VW63合金、树脂砂反重力方法制备的整体铸件满足了结构承载能力需求,并且在测试过程中铸件位移(变形)与载荷和加载时间呈现出良好的线性关系,证实了VW63铸件的安全性与可靠性,可为VW63合金的后续应用提供参考。

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 tendency of two types of alloys were studied by the methods such as thermal analysis and improved crack ring specimens.The solidification 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 different 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 alloy 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.