超声振动-真空差压协同场下ZL114A合金共晶硅的生长特性  

Growth characteristics of ZL114A alloy eutectic silicon under synergistic field between ultrasonic vibration and vacuum counter-pressure

作　　者：严青松[1] 杨普超 芦刚[1] 王清[1] 段勇标 YAN Qing-song;YANG Pu-chao;LU Gang;WANG Qing;DUAN Yong-biao(School of Aeronautic Manufacturing Engineering,Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]南昌航空大学航空制造工程学院,南昌330063

出　　处：《中国有色金属学报》2018年第8期1507-1515,共9页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(51261025);上海航天科技创新基金资助项目(SAST2016046)~~

摘　　要：采用SEM和XRD等手段,分析超声功率与凝固压力对ZL114A合金共晶硅的生长取向及形貌的影响,探讨超声振动-真空差压协同场下ZL114A合金共晶硅的生长特性。结果表明:超声振动-真空差压协同作用对ZL114A合金共晶硅的生长取向及形貌的影响显著。随着超声功率的增加,ZL114A合金共晶硅的择优生长取向面(111)、(220)及(331)逐渐被抑制;当超声功率600 W时,基本不存在择优取向,同时共晶硅由粗大片状转变为细小的短棒状,且分布均匀;当超声功率超过600 W时,共晶硅择优生长取向抑制减弱,且细化效果有所减弱;随着凝固压力的增加,ZL114A合金共晶硅的3个主要择优生长取向面逐渐被抑制,共晶硅细化效果越来越显著。超声功率600 W和凝固压力350 k Pa为最佳超声功率与凝固压力的协同作用效果。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 600 W, 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.

关 键 词：超声功率 凝固压力 共晶硅 生长取向 形貌 

分 类 号：TG249.2[金属学及工艺—铸造]