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在A380合金中添加质量分数为0~0.5%的稀土Sc进行高强超声振动,研究Sc及高强超声振动对A380合金显微组织和力学性能的影响及作用机理。结果表明:加入Sc及高强超声振动可以使A380合金显微组织中的初生α相明显细化,由粗大的树枝晶变为细小、无定向的枝晶,并且形态变为圆整;Sc质量分数为0.3%时,对α相的细化效果最佳,Sc与高强超声振动还使A380合金显微组织中的共晶Si和Al3Fe Si2相尺寸显著减小,由粗大的针片状变为蠕虫状和点状;Sc质量分数为0.3%的A380合金铸造状态下的抗拉强度、伸长率、硬度分别为299 MPa、3.68%、104BHN,高强超声振动作用下则分别为314 MPa、3.7%、109BHN,此时,单位面积晶粒数量最多。
High-strength ultrasonic vibration was added to A380 alloy by adding rare earth Sc with mass fraction of 0-0.5% to study the effect of Sc and high-intensity ultrasonic vibration on the microstructure and mechanical properties of A380 alloy and its mechanism of action. The results show that the addition of Sc and high-intensity ultrasonic vibrations can refine the primary α phase in the microstructure of A380 alloy from coarse dendrites to fine and non-directional dendrites, and the morphology becomes rounded. Sc mass fraction Is 0.3%, the effect of refinement on the α phase is the best. Sc and high-intensity ultrasonic vibration also make the size of the eutectic Si and Al3Fe Si2 phase in the A380 alloy microstructure significantly reduced from coarse needle-like to worm The tensile strength, elongation and hardness of A380 alloy with the mass fraction of 0.3% were 299 MPa, 3.68% and 104 BHN, respectively, and they were 314 MPa and 3.7% respectively under high-intensity ultrasonic vibration. , 109BHN, this time, the largest number of grains per unit area.