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《Journal of Beijing University of Aeronautics and Astronautics》 2004-10
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Effects of Zr addition on structure and properties of Mg-Zr alloy

Kong Zhigang Liu Hongbo Zhang Hu (School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China)  
Grain refining mechanisms of magnesium-zirconium alloys were investigated. Mg-Zr alloys were prepared and a mixture gas containing SF 6 was used for protection during melting and casting. The microstructure and properties of Mg-Zr alloys and the effects of strain, frequency, temperature as well as the addition of Zr on the damping capacity were studied. The damping capacity was validated with vibration attenuation experiment. The results show that zirconium is a potent grain refiner for magnesium alloys. The average grain size can be reduced to 30?μm for Mg-0.45%Zr(mass fraction) alloy and the mechanical properties of Mg-Zr alloys can be dramatically improved with increasing zirconium content. It is also found that the damping capacity has almost no connection with frequency, but increases with strain, the loss factor reaches 5.3×10 -2 at a strain amplitude of 1×10 -4. The value of transfer ratio of Mg-Zr base is 1.88 and obviously less than that of ZM6 alloy base and LY12 alloy base.
【Fund】: 国家 8 63基金资助项目 ( 2 0 0 3AA3 0 5 0 71)
【CateGory Index】: TG115
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