静磁场对2024铝合金凝固组织的影响  

Effects of Static Magnetic Field on Solidification Structure of 2024 Aluminum Alloy

作　　者：程常桂[1] 余乐[1] 万文成[1] 刘中天[1] 金焱[1] 

机构地区：[1]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室

出　　处：《特种铸造及有色合金》2012年第2期103-106,共4页Special Casting & Nonferrous Alloys

基　　金：湖北省自然科学基金资助项目(2009CDB358)

摘　　要：通过热模拟试验及扫描电镜分析,研究了静磁场对2024铝合金显微晶粒度、凝固速度、合金元素分布的影响。结果表明,随着磁感应强度的增大,合金凝固组织明显细化,凝固时间变短,这与凝固前沿熔体内的塞贝克效应有关,使得熔体对流效应强于静磁场的制动效应;应用静磁场能够增强溶质原子在铝中的扩散,有利于提高合金元素的固溶度,减轻凝固组织的宏观偏析。Effects of static magnetic on the microscopic grain density, solidification rate and distribution of alloy elements in 2024 aluminum alloy were investigated by means of thermal simulation experiment and scanning electron microscope （SEM）. The results show that the solidification structure can be refined with increasing in magnetic intensity, and the solidification time is decreased, which are closely related to the Seebeck effect acting on liquid metal in solidification front as a result of enhancing the flow of liquid metal and inhibiting the electromagnetic brake effects. Furthermore, the static magnetic field can promote disfussion of solute atoms in aluminum alloy, and it is favorable to improving solid solubility of alloy elements and decreasing macro-segregation of 2024 aluminum alloy.

关 键 词：静磁场 2024铝合金 凝固组织 塞贝克效应 

分 类 号：TG146.21[一般工业技术—材料科学与工程]