(南昌航空大學(xué) 航空制造工程學(xué)院，南昌 330063)
摘 要: 采用SEM和XRD等手段，分析超聲功率與凝固壓力對(duì)ZL114A合金共晶硅的生長(zhǎng)取向及形貌的影響，探討超聲振動(dòng)-真空差壓協(xié)同場(chǎng)下ZL114A合金共晶硅的生長(zhǎng)特性。結(jié)果表明：超聲振動(dòng)-真空差壓協(xié)同作用對(duì)ZL114A合金共晶硅的生長(zhǎng)取向及形貌的影響顯著。隨著超聲功率的增加，ZL114A合金共晶硅的擇優(yōu)生長(zhǎng)取向面(111)、(220)及(331)逐漸被抑制；當(dāng)超聲功率600 W時(shí)，基本不存在擇優(yōu)取向，同時(shí)共晶硅由粗大片狀轉(zhuǎn)變?yōu)榧?xì)小的短棒狀，且分布均勻；當(dāng)超聲功率超過600 W時(shí)，共晶硅擇優(yōu)生長(zhǎng)取向抑制減弱，且細(xì)化效果有所減弱；隨著凝固壓力的增加，ZL114A合金共晶硅的3個(gè)主要擇優(yōu)生長(zhǎng)取向面逐漸被抑制，共晶硅細(xì)化效果越來越顯著。超聲功率600 W和凝固壓力350 kPa為最佳超聲功率與凝固壓力的協(xié)同作用效果。
關(guān)鍵字: 超聲功率；凝固壓力；共晶硅；生長(zhǎng)取向；形貌
（School of Aeronautic Manufacturing Engineering, Nanchang Hangkong University, Nanchang 330063, China）
Abstract:The effects of ultrasonic power and solidification pressure on the growth orientation and morphology of ZL114A eutectic silicon were analyzed by SEM and XRD, the eutectic silicon growth characteristics of ZL114A alloy under synergistic field between ultrasonic vibration and vacuum counter-pressure were discussed. The results indicate that the synergistic effect of ultrasonic vibration and vacuum counter-pressure on the growth orientation and morphology of ZL114A eutectic silicon is significant. With the increase of ultrasonic power, the preferential growth orientations (111), (220) and (331) of ZL114A eutectic silicon are gradually suppressed, when the ultrasonic power is 600W, there is no preferred orientation, meanwhile, eutectic silicon turns from coarse flakes into small short rod-like and evenly distribute. When the ultrasonic power is more than 600 W, the preferential growth orientation of eutectic silicon decreases and the refinement effect decreases. With the increase of the solidification pressure, the three major preferred orientation surfaces of ZL114A alloy eutectic silicon are gradually restrained, and the refinement effect of eutectic silicon is more and more significant. Meanwhile, the optimal synergistic effects are obtained as ultrasonic power of 600 W and solidification pressure of 350 kPa.
Key words: ultrasonic power; solidification pressure; eutectic silicon; growth orientation; morphology
