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研究了不同电压(0~300 V)下机械振动对长周期结构增强Mg97Y2Cu1合金凝固组织和力学性能的影响。结果表明:在机械振动的作用下,合金的凝固组织显著细化,力学性能提高。随着电压的增加,合金的初生相尺寸逐渐减小,其形态由发达的树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;合金的抗拉强度和伸长率总体上逐渐提高;当电压为300 V时,合金的抗拉强度和伸长率较常规铸造条件分别提高了84.5%和158%。
The effects of mechanical vibration at different voltages (0 ~ 300 V) on the microstructure and mechanical properties of Mg97Y2Cu1 alloy strengthened by long-period structure were studied. The results show that under the action of mechanical vibration, the solidified microstructure of the alloy is remarkably refined and its mechanical properties are improved. With the increase of the voltage, the size of the primary phase of the alloy gradually decreases, and its morphology changes from developed dendrites to fine equiaxed or rosette crystals. The second phase distribution becomes uniform and continuous. The tensile strength and elongation As a whole, the length of the alloy increased gradually. When the voltage was 300 V, the tensile strength and elongation of the alloy increased by 84.5% and 158% respectively compared with the conventional casting conditions.