超声温度对电机转子用Al-12%Si合金凝固组织及性能的影响  

Effect of Ultrasonic Waves on Microstructures and Properties of Solidified Al-12% Si Alloy: An Experimental Study

作　　者：齐冠然 郭正恩 Qi Guanran;Guo Zhengen(Equipment Engineering Department,Henan Technical College of Construction,Zhengzhou 450064,China;Mechanical and Electrical Engineering Department,Zhengzhou Institute of Business Technicians,Zhengzhou 450121,China)

机构地区：[1]河南建筑职业技术学院设备工程系,郑州450064 [2]郑州商业技师学院机电工程系,郑州450121

出　　处：《真空科学与技术学报》2019年第7期599-603,共5页Chinese Journal of Vacuum Science and Technology

摘　　要：研究Al-12%Si合金在凝固期间受到不同功率超声作用时得到的组织结构,对α(Al)组织与Al+Si共晶相的微观形态进行了观察。实验测试结果表明:相对于未超声处理,对各凝固阶段加入超声场作用之后都会明显减小凝固组织的数量与气孔尺寸。增加超声作用后可以使各阶段的Al-12%Si合金都在凝固期间形成更小的气孔率,并且超声作用程度最明显的是液相阶段。受到超声作用的情况下,Si相发生了长宽比的显著减小,对初生组织的形核与晶粒生长过程进行超声后,得到了具有最小长宽比的Si相组织。加入超声处理后,使Al-12%Si合金形成了具有更高硬度的初生α(Al)相与共晶组织。与初生α(Al)相比,对合金液相进行超声时可以获得最大的硬度,相对未超声处理组织增大了20.3%。经过超声处理后,Al-12%Si合金在压缩期间出现了墩粗变形,具有明显的塑性变形特征,其屈服强度发生了较大提升。the microstructure of Al-12%Sii alloy subjected to different power ultrasound during solidification was studied.The microstructure of(Al) and Al+Si eutectic phase was observed.The experimental results showed that compared with the non-ultrasonic treatment,the number of solidified tissues and the size of pores were significantly reduced after the addition of ultrasonic field in each solidification stage.After increasing the ultrasonic effect,the porosity of Al-12%Si alloy in each stage can be reduced during solidification,and the most obvious ultrasonic effect is in the liquid phase.Under the action of ultrasound,the aspect ratio of Si phase decreased significantly.After the nucleation and grain growth of primary tissues were ultrasonic,the Si phase structure with the minimum aspect ratio was obtained.After adding ultrasonic treatment,α(Al) phase and eutectic structure with higher hardness were formed in al-12% Si alloy.Compared with α(Al),the maximum hardness was obtained by ultrasonic treatment of the alloy liquid phase,and the microstructure was increased by 20.3%.After ultrasonic treatment,rough deformation of piers occurred in al-12% Si alloy during compression,which showed obvious plastic deformation characteristics,and its yield strength was greatly improved.

关 键 词：超声场 共晶凝固 组织形成 力学性能 

分 类 号：TG113.[金属学及工艺—物理冶金]