Study on High-strength Damping Mg-Zr-series Alloy——Analysis of Damping Behavior of Ca/Y Modified Mg-0.6Zr Alloy

The effect of Ca/Y modification on damping behavior of Mg-0.6Zr alloy are investigated by dynamic mechanical analyzer and the damping mechanism depended on strain amplitude and temperature is also analyzed.The results showed the alloy tensile strength and elongation is improved by fine-grain intensification and solid solution intensification upon modification with the addition of Ca/Y 0.3 %Ca,0.3%Ca+0.1 %Y(mass %).Meanwhile,the addition of Ca/Y and further impediment of the dislocation movement due to more grain boundary has reduced alloy strain amplitude effect,resulting in lower damping performance.It is also found out that distinct damping peak(P1)appears in Mg-0.6Zr alloy at 75 ℃ while the modification with the addition of 0.3 %Ca+0.1 %Y suspends the damping peak.The damping mechanism of the tested alloys could be explained as mechanism of G-L dislocation damping model and viscous sliding and softening of the grain boundaries.