稀土元素Y对Mg-0.6%Zr合金力学性能与阻尼行为的影响

Effect of Rare Earth Y on Mechanical Properties and Damping Behavior of Mg-0.6%Zr Alloy

研究了添加微量稀土元素Y对Mg-0.6%Zr合金力学性能与阻尼行为的影响。结果表明,由于Y的固溶强化及细晶强化作用,添加稀土元素Y可提高Mg-0.6%Zr合金的力学性能;同时由于Y在合金基体中的固溶及晶粒细化后晶界数量的增加,使合金的应变振幅无关阻尼略有降低,临界应变振幅显著增大,但应变振幅相关阻尼变化不大。合金的阻尼行为可采用Granato-L櫣cke位错阻尼理论解释。

The effect of rare earth Y addition on the mechanical properties and damping behavior of Mg-0.6 % Zr alloy was investigated. The results show that the addition of rare earth Y can improve mechanical properties of Mg-0.6% Zr alloy due to solid solution strengthening and grain refinement. Due to solution of Y in matrix and the increase in grain boundary, the damping capacity of strain amplitude independent part reduces slightly and the critical strain amplitude increases obviously, but the damping capacity of strain amplitude dependent part changes slightly. Damping behavior of the alloy can be explained by Granato-Lücke dislocation damping theory.