【摘要】 研究了热轧及退火对3种Mg-Zr系阻尼合金(Mg-0.6Zr、Mg-0.6Zr-0.4Zn、Mg-0.6Zr-0.4Zn-1.5Cd)组织和性能的影响。结果表明:热轧使晶粒发生明显细化,力学性能获得提高。铸态合金的阻尼性能与应变振幅有关,随着应变振幅的提高而不断提高;经热轧,合金的阻尼性能显著下降,几乎与应变振幅无关;热轧后的退火处理使合金的阻尼性能又有上升,但低于铸态水平。在各种状态下,Mg-0.6Zr-0.4Zn和Mg-0.6Zr-0.4Zn-1.5Cd合金的力学性能明显高于Mg-0.6Zr合金,而铸态时的阻尼性能与Mg-0.6Zr合金的相差不大,但经过热轧及退火之后又有较大差距。Mg-Zr系合金上述阻尼性能的变化可以用Granato-Lücke位错模型来解释。更多还原

【Abstract】 The effects of hot rolling and subsequent annealing on the microstructures and properties of the three kinds of Mg-Zr alloys(Mg-0.6Zr、Mg-0.6Zr-0.4Zn、Mg-0.6Zr-0.4Zn-1.5Cd) were investigated.The results show that the hot rolling lead to a significant grain refinement,and their mechanical properties are enhanced.The damping capacity in cast condition is dependent on strain amplitude,and it increases with its enhancement.However,the damping capacity of the hot rolled alloys weakly depends on strain amplitude and decreases after hot rolling.After subsequent annealing,the damping capacity of the rolled alloy increases,but is still lower than that of the as-cast one.The mechanical properties of Mg-0.6Zr-0.4Zn and Mg-0.6Zr-0.4Zn-1.5Cd alloys are higher than that of the Mg-0.6Zr alloy in all different conditions,and their damping capacity is similar to that of the Mg-0.6Zr alloy in cast condition while much lower than that of the Mg-0.6Zr alloy after hot rolling and annealing.Damping capacity of the Mg-Zr alloys at different conditions can be explained by the dislocation model of Granato and Lücke.更多还原