在研究中采用了不同的变质剂如Na、Sr、Sb和Te处理含1O—13％Si的ZL102合金,按照ASTME339—74标准测试了它们的断裂韧性。结果表明,采用不同变质剂处理的Al—Si合金试样的断裂韧性值变化不大。在金相显微镜下直接观察了受拉伸试样和三点弯曲试样的裂纹扩展的动态过程。探讨了Al—Si合金组成相对断裂行为的影响。 ZL102 alloys containing 10% -13% Si were treated with different modifiers such as Na, Sr, Sb and Te in the study, and their fracture toughness was tested according to ASTM E339-74. The results show that the fracture toughness values ​​of Al-Si alloy treated with different modifiers have little change. The dynamic process of crack growth under tensile specimens and three-point bending specimens was directly observed under a metallographic microscope. The effect of relative fracture behavior of Al-Si alloy was discussed.