电磁能对Al-Si-Cu-Mg-Ni活塞合金铸锭组织的影响  

Effect of electromagnetic energy on the ingot structure of Al-Si-Cu-Mg-Ni piston alloy

作　　者：郭有军 闫春雷 鲍鑫宇[2] 麻永林[2] GUO You-jun;YAN Chun-lei;BAO Xin-yu;MA Yong-lin(Baotou Aluminium(Group)Co.,Ltd,Baotou 014010,China;School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou 014010,China)

机构地区：[1]包头铝业有限公司,内蒙古包头014010 [2]内蒙古科技大学材料与冶金学院,内蒙古包头014010

出　　处：《轻合金加工技术》2022年第1期8-13,共6页Light Alloy Fabrication Technology

基　　金：内蒙古自治区自然科学基金项目(2018MS05008);内蒙古自治区自然科学基金项目(2020MS05046);内蒙古自治区科技计划项目(2021GG0096)。

摘　　要：应用新型脉冲电磁场晶粒细化技术对Al-Si-Cu-Mg-Ni活塞合金熔铸中进行脉冲电磁场处理,探究电磁能对Al-Si-Cu-Mg-Ni活塞合金铸态微观组织的影响。利用光学显微镜(OM)与场发射扫描电镜(FESEM)对Al-Si-Cu-Mg-Ni活塞合金铸锭进行微观组织观察。结果表明,施加脉冲电磁场情况下,铸锭组织中初生相α-Al平均尺寸及一次、二次枝晶臂间距减小。耐热相尺寸减小且形态及分布状态均发生改变。脉冲电磁场频率为20 Hz时,铸锭心部位置的初生相α-Al平均尺寸减小到24μm,铸锭边部的α-Al平均尺寸为17μm,心部组织中一次枝晶臂间距、二次枝晶臂间距分别减小20.5%、10.53%,边部的分别减小31.2%、13.9%。进行脉冲电磁场细化机制分析,脉冲电磁场携带能量,在电磁能作用下,熔体结构发生改变。A new pulsed electromagnetic field grain refinement technique was applied to Al-Si-Cu-Mg-Ni piston alloy for pulsed electromagnetic field treatment when casting to investigate the effect of electromagnetic energy on the as-cast micro-structure of Al-Si-Cu-Mg-Ni piston alloy. The micro-structure of Al-Si-Cu-Mg-Ni piston alloy ingots was observed using optical microscopy(OM) and field emission scanning electron microscopy(FESEM). The results show that the average size of the primary phase α-Al and both the primary and secondary dendrite arms spacings decrease after the application of the pulsed electromagnetic field. The size of the heat-resistant phase is decreased and both the morphology and distribution state are changed. At a frequency of 20 Hz, the average size of primary phase α-Al in the ingot core is reduced to 24 μm, and the average size of α-Al at the edge was 17 μm. The primary and secondary dendritic arms spacings in the core are decreased by 20.5% and 10.53%, respectively, and that at the edge are decreased by 31.2% and 13.9%, respectively. The pulsed electromagnetic field refinement mechanism analysis was carried out, and the melt structure was changed by the pulsed electromagnetic field carrying energy and electromagnetic energy.

关 键 词：晶粒细化 脉冲电磁场 微观组织 电磁能 

分 类 号：TG292[金属学及工艺—铸造]