Research Of The Creep Resistance Property Of The Magnesium Alloys

As the lightest constructional material, magnesium alloy has high specific strength, high specific stiffness, good magnetic-shielding ability, good damping ability, and good machinability.Magnesium alloy is a very important materials,which is being increasingly used in many manufacturing industries,especially in the automobile industry in order to save weight thereby reducing fuel consumption and pollution. Alloy ZM5 and AM60 are the most favored magnesium alloys,being used in approximately most of cast products.However, the range of applications for this alloy is limited by their poor creep resistance at the temperature above 120℃,which makes it unsuitable for many of component in automobile engines.Therefore ,showing good mechanical properties,lower cost and creep resistance at elevated temperatures should be developed,which is one of the focuses in material science rencently.The purpose of study is to develop a cheap creep resisitance magnesium alloy based on ZM5 .In this paper the effect of Si and Re addition on the microstructure and creep resistance has been studied. Si and RE were used as additions to refine the microstructure and improve the mechanical properties of the ZM5 alloys. the creep resistance of the ZM5 alloy were improved for Addition of Si resulted in the formation of rude Mg2Si dispersed phases.but the tensile property was decreased .a combination of 1.0% Si and 0.12%Re enhance the creep resisitance of the alloy at elevated temprature farther. The investigation results show that RE addition to the alloy conbined the rude Mg2Si phase refines the base microstucture,then the improved microstructure of the modified alloy results in the large improvement in creep resistance at the elevated temperature of 150℃. The creep resistance alloys will accelerate the production and application of Mg alloy and boost the development of magnesium industry. It will promote the development of vehicle and electronics industries, which are adopting more and more Mg alloy parts. And it will also speed up the research and application of rare earth materials and the exploration of the abundant rare earth resources in China.