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采用金相分析、拉伸试验等方法测试了不同超声施振温度对ZL114A合金凝固组织和力学性能的影响,并通过扫描电镜(SEM)对试样断口形貌进行观察和分析。结果表明,超声施振温度显著影响ZL114A合金的凝固组织及力学性能。随着超声施振温度的升高,合金凝固组织从发达的树枝晶向等轴晶,最后又向树枝晶发生转变,超声施振温度过低、过高都会降低细化效果,最佳超声施振温度为700℃,且获得了最佳的综合力学性能,抗拉强度为289 MPa,伸长率为4.62%,合金的拉伸断口存在大量韧窝,断裂方式以韧性断裂为主。
The effects of different ultrasonic vibration temperature on the microstructure and mechanical properties of ZL114A alloy were investigated by metallographic analysis and tensile test. The fracture morphology was observed and analyzed by scanning electron microscopy (SEM). The results show that the temperature of ultrasonic vibration significantly affects the solidification microstructure and mechanical properties of ZL114A alloy. With the increase of the temperature of ultrasonic vibration, the solidified microstructure changes from developed dendrite to equiaxed and finally to dendrite. When the ultrasonic vibration temperature is too low and too high, the refinement effect will be reduced. The vibration temperature is 700 ℃, and the best mechanical properties are obtained. The tensile strength is 289 MPa and the elongation is 4.62%. There are a large number of dimples in the tensile fracture of the alloy, and the fracture mode is dominated by ductile fracture.