超声处理对重熔半连铸ZL205A铝合金组织与性能影响  

Effects of Ultrasonic Outfield on Solidification Microstructure and Properties of Remelted Semi-continuous ZL205A

作　　者：王冲 蒋日鹏 李瑞卿 李晓谦 张立华 Wang Chong;Jiang Ripeng;Li Ruiqing;Li Xiaoqian;Zhang Lihua(State Key Laboratory of High Performance Complex Manufacturing,School of Mechanical and Electrical Engineering,Central South University;Light Alloy Institute,Central South University)

机构地区：[1]中南大学机电工程学院,高性能复杂制造国家重点实验室 [2]中南大学轻合金研究院

出　　处：《特种铸造及有色合金》2020年第9期939-945,共7页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51575539,51805549);湖南省自然科学基金青年基金资助项目(2017JJ3391)。

摘　　要：在720℃下对半连铸制备的ZL205A铝合金铸锭采用不同的超声处理,通过调整超声作用时间(2、4、6、8、10min)及超声功率(0、100、120、140、160、180、200W)设计3组试验,研究不同超声场参数对铸锭凝固组织影响的作用机理,并确定试验中的最优超声工艺参数组合。结果表明,超声波作用于ZL205A铝合金熔体能促进共晶组织分布均匀化,显著细化晶粒尺寸,提高铸锭的综合力学性能;超声波能有效细化金属间化合物,促进金属间化合物的形成及均匀分布,提高形核率,这是超声作用改善铸锭品质的主要机理;当超声功率一定时,超声作用时间为10min时最佳;当超声作用时间一定时,超声功率为160W时最佳。试验可知,超声作用时间为10min及超声功率为160W时,合金的性能最理想。The semi-continuous casting ZL205Aaluminum alloy ingot was treated by different ultrasonic treatment at 720℃.Three groups of experiments were designed by adjusting ultrasonic action time(2、4、6、8、10min)and ultrasonic power(0、100、120、140、160、180、200W)to analyze effect mechanism of different ultrasonic field parameters on the solidification microstructure of ingots and to determine the optimal ultrasonic process parameters.The results show that the ultrasonic effect on the semi-continuous casting ZL205Aaluminum alloy melt can promote the homogeneity of the eutectic structure distribution,significantly refining the grains and improving the comprehensive mechanical properties of the ingot.Ultrasonic energy can refine effectively intermetallic compounds,improving the formation and uniform distribution of intermetallic compounds,thereby increasing the nucleation rate,which is responsible for significantly improving the quality of the ingot.With a given ultrasonic power,the optimal ultrasonic action time is 10min,and with a fixed ultrasonic action time,the optimal ultrasonic power is 160W.The optimal ultrasonic process parameters can be obtained by three groups of experiments:ultrasonic action time of 10min and ultrasonic power of 160W.

关 键 词：半连铸ZL205A铝合金 凝固组织 超声工艺参数 熔体 形核率 

分 类 号：TB559[理学—物理] TG249.7[理学—声学]