电磁场对7050铝合金凝固组织和元素分布影响  

Influence of electromagnetic fields on microstructures and solute element distribution of 7050 aluminum alloy during the solidification

作　　者：刘金炎[1] 王家淳[1] 郭世杰[1] 马科[1] 薛冠霞[1] 曹志强[2] 

机构地区：[1]苏州有色金属研究院有限公司,苏州215026 [2]大连理工大学铸造工程中心,辽宁大连116024

出　　处：《材料科学与工艺》2010年第1期7-10,共4页Materials Science and Technology

基　　金：江苏省自然科技基金项目(BK2008562)

摘　　要：为了研究中频电磁场对7050铝合金凝固组织和元素分布的影响,在未施加电磁场,施加1000Hz、6000A电磁场和1000Hz、4000A电磁场下进行7050铝合金凝固试验.利用金相显微镜和电子背散射衍射分析技术分析了锭坯微观组织,利用化学分析方法测定溶质元素沿锭坯边部到中心的分布情况.结果表明:外加中频电磁场有效地细化晶粒,影响溶质元素分布.未施加电磁场下,锭坯晶粒最大,发生反偏析;1000Hz、4000A电磁场下,锭坯晶粒次之,发生反偏析;1000Hz、6000A电磁场下,锭坯晶粒最细,发生正偏析.To study the influence of electromagnetic fields on microstructures and solute element distribution of 7050 aluminum alloy during the solidification,the solidification experiments of 7050 aluminum alloy were performed both in the absence and in the presence of medium-frequency electromagnetic fields （1000 Hz,4000 A and 1000 Hz,6000 A）. Microstructures of an ingot were investigated by metallurgical microscope and electron-back-scattering-diffraction,and distributions of alloying elements were investigated by chemical analysis. The results show that medium-frequency electromagnetic fields play an important role on microstructures and solute element distribution of the ingot during the solidification. The ingot solidified in the absence of electromagnetic fields exhibits large grains and negative segregation of alloying elements,however the ingot exhibits small grains and negative segregation of alloying elements in the presence of electromagnetic field of 1000 Hz and 4000 A,and the ingot exhibits the smallest grains and normal segregation of alloying elements in the presence of electromagnetic field of 1000 Hz and 6000 A.

关 键 词：电磁场 细化晶粒 宏观偏析 7050铝合金 

分 类 号：TF777[冶金工程—钢铁冶金] TG113.2[金属学及工艺—物理冶金]