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研究了超声处理对AS31镁合金凝固组织和力学性能的影响,并对其作用机理进行了探讨。结果表明,随着超声功率增加,AS31镁合金的晶粒尺寸显著细化,组织中共晶Mg2Si相形貌、尺寸和分布明显得到改善。当施加超声功率为750 W时,共晶Mg2Si相由粗大汉字状转变为短棒状,其平均尺寸由未施加超声时的160μm减少到50μm。另外其抗拉强度和伸长率分别为203 MPa和3.4%,比未超声合金分别提高了25%和100%,分析其断口发现,未经超声处理的AS31镁合金表现为解理断裂,经过超声处理的AS31镁合金表现为韧窝断裂。
The effect of ultrasonic treatment on the solidification microstructure and mechanical properties of AS31 magnesium alloy was studied, and its mechanism of action was also discussed. The results show that with the increase of ultrasonic power, the grain size of AS31 magnesium alloy is significantly refined, and the morphology, size and distribution of eutectic Mg2Si phase in the microstructure are obviously improved. When the ultrasonic power is 750 W, the eutectic Mg2Si phase is transformed into a short rod shape from the coarse Chinese character, and its average size is reduced from 160 μm to 50 μm when no ultrasonic is applied. In addition, the tensile strength and elongation were 203 MPa and 3.4% respectively, which were increased by 25% and 100% respectively compared with that of the non-ultrasonic alloy. Analysis of the fracture revealed that untreated AS31 magnesium alloy showed cleavage fracture, AS31 treated magnesium alloy showed dimple fracture.