超声波辅助铸轧AZ31镁合金板带的实验研究  

Experiment research on ultrasound cast-rolling AZ31 alloy strip

作　　者：李建平[1] 胡建冰[1] 毛大恒[1] 赵冠中[1] 

机构地区：[1]中南大学机电工程学院,湖南长沙410083

出　　处：《华中科技大学学报（自然科学版）》2010年第12期126-128,132,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50974139);国家重点基础发展研究计划资助项目(2007CB613706)

摘　　要：将超声波导入杆安装在水平式双辊铸轧机的凝固前沿,进行超声波镁板带的铸轧试验.对超声波铸轧镁板带和普通铸轧镁板带进行金相对比观察表明:普通铸轧镁板带枝晶网胞比较发达,组织不均匀,晶粒平均尺寸(直径)在50～60μm之间;而在镁铸轧过程中施加超声波能够使镁板带组织更加均匀,晶粒细化,晶粒平均尺寸(直径)在20～30μm之间.对镁板带的力学性能测试证实,超声波处理使铸轧镁板带的抗拉强度、屈服强度和延伸率比普通铸轧镁板带的分别提高了22.85%,49.78%和123.06%.The experiment of ultrasond cast-rolling magnesium strip was carried out on the horizontal twin-roll cast-rolling machine with the ultrasonic pole used in the solidification.The microstructure of ultrasonic and general cast-rolling magnesium strip were characterized.The results show that the cellular dendrite of the general cast-rolling magnesium strip is coarse,the grainstructure was heterogeneous and the average grain diameter was between 50？？60 ？？.However,the grainstructure become more homogenize with the ultrasonic treatment for cast-rolling magnesium strip,the grain is refined and the average grain diameter was between 20？？30 ？？.Besides,the mechanical properties test results certified the tensile strength,yield strength and elongation of the ultrasonic cast-rolling magnesium strip are increased by 22.85%,49.78% and 123.06% than that of the general strip.

关 键 词：铸轧 力学性能 抗拉强度 延伸率 AZ31镁合金 超声波 

分 类 号：TG335[金属学及工艺—金属压力加工] TB559[理学—物理]