(东北大学黄金学院， 沈阳110015)
摘 要: 研制成功率超声铸造设备和附属装置，研究了全过程超声处理和结晶前超声处理对Al-Si共晶和过共晶合金铸造组织和性能的影响。结果表明：适宜的超声参数对初晶Si和共晶Si组织具有双重细化作用，使Si破碎变成颗粒状，合金的机械强度和塑性明显提高。认为超声细化合金组织存在阈值声压，对功率超声细化合金组织的机理进行了理论上的分析和探讨。
关键字: 功率超声；Al-Si合金；组织性能
（Institute of Gold Technology, Northeastern University, Shenyang 110015, P. R. China）
Abstract:The casting device of ultrasonic vibration was designed. The effect of high-intensity ultrasonic on the structures and properties of the eutectic and hypereutectic Al-Si alloys was studied. It is shown that appropriate ultrasonic parameters can fine both the primary Si and the eutectic Si, Si phase is broken off into globular thus raising the strength and plasticity of the alloys remarkably. The mechanisms of ultrasonic action were investigated experimentally and approached theoretically, on the basis of which it is concluded that there exists an ultrasonic intensity threshold in fining the alloy structures.
Key words: ultrasonic; Al-Si alloys; structure and property
