超声-脉冲磁场处理对Mg_(97)Y_2Cu_1合金组织和性能的影响

Effect of Compound Treatment of Ultrasounic and Pulsed Magnetic Field on Solidified Structure and Mechanical Properties of Mg_(97)Y_2Cu_1 Alloy

对比研究了未处理、脉冲磁场处理、超声处理和超声-脉冲磁场复合处理对长周期结构增强Mg97Y2Cu1合金凝固组织和力学性能的影响,并考察了复合处理条件下不同的施振温度对合金初生相形貌、室温及高温力学性能的影响。结果表明,经超声-脉冲磁场复合处理后,合金的凝固组织及力学性能均得到了改善,其效果好于单一的超声处理或脉冲磁场处理;合金的初生相显著细化,其形态由发达的枝晶转变为细小的等轴晶或蔷薇状晶体,第二相分布变得均匀和连续,同时分布在晶界上的第二相体积分数有较大幅度提高;合金的抗拉强度和伸长率较常规铸造条件分别提高了30.1%和119.6%。

Solidified structure and mechanical properties of Mg97Y2Cu1 alloy reinforced by long period ordered structure were investigated comparatively,under the condition of without treatment,with pulsed magnetic field（PMF）treatment,ultrasonic treatment and compound treatment of ultrasonic and pulsed magnetic field.Morphology of primary phase and mechanical properties of the alloy at room and high temperature with different vibration temperatures under compound treatment were analyzed.The results reveal that solidified structure and mechanical properties of the alloy can be improved by compound treatment.Refinement effect of solidified structure by compound treatment is more superior to that of ultrasonic treatment or pulsed magnetic field treatment ones.Primary phase in the alloy can be refined greatly,which is transformed from developed dendrites into equiaxed or rosette-shaped crystal.Meanwhile,distribution of second phase becomes more uniform and continuous with the increase of volume fraction along grain boundary.Tensile strength and elongation of the alloy are increased by up to 30.1%and 119.6%,respectively,compared with those of the alloy under traditional condition.