凝固特性的影響
(上海大學(xué) 材料科學(xué)與工程學(xué)院，上海 200072)
摘 要: 研究了功率超聲處理對ZL102鋁硅合金凝固特性的影響。研究發(fā)現(xiàn)：在凝固過程中進行超聲處理能顯著細化共晶硅相，改善其形貌及分布；通過對比未處理、300 W超聲波及500 W超聲波處理條件下鋁硅合金不同部位的力學(xué)性能及斷口形貌，發(fā)現(xiàn)功率超聲處理明顯提高鋁硅合金的力學(xué)性能，且隨著處理功率的增大，合金的力學(xué)性能隨之提高。并分析了超聲波在鋁硅合金中傳播時衰減的原因，通過數(shù)學(xué)方法得到衰減方程，并探討了其衰減規(guī)律。
關(guān)鍵字: 共晶Al-Si合金；功率超聲波；凝固組織；力學(xué)性能；衰減
solidification characterization of
Al-Si eutectic alloy
（School of Materials Science and Engineering, Shanghai University,
Shanghai 200072, China）
Abstract:The influence of side-introduced power ultrasonic treatment on the solidification characterization of ZL102 Al-Si alloy was discussed. The results show that the ultrasonic treatment on the alloy during solidification can refine the structure, develop the morphology and distribution of eutectic silicon. The mechanical properties and fractographs of the alloy by treatments without ultrasonic, 300 W ultrasonic and 500 W ultrasonic treatment were also compared. The results indicate that the power ultrasonic treatment can enhance the tensile strength obviously, and the mechanical properties increase with increasing ultrasonic power. The reason of ultrasonic attenuation was analyzed and the law of ultrasonic attenuation into the melt was discussed by the mathematical method.
Key words: Al-Si eutectic alloy; power ultrasonic; solidification structure; mechanical property; attenuation
