电脉冲孕育处理对纯铝凝固组织的影响  

Effect of electric pulse modification on the solidification structure of pure aluminum

作　　者：王建中[1] 齐锦刚[1] 杜慧玲[2] 刘铁铮[1] 苍大强[2] 

机构地区：[1]辽宁工业大学材料与化学工程学院,锦州121001 [2]北京科技大学冶金与生态工程学院,北京100083

出　　处：《材料科学与工艺》2008年第5期646-649,共4页Materials Science and Technology

基　　金：国家自然科学基金(50174028)

摘　　要：金属熔体结构对液-固相变动力学及其凝固组织具有重要影响.本文通过对处于熔点以上的纯铝施加电脉冲,系统研究了其凝固组织及其力学性能的变化.结果表明:脉冲电场处理后,试样晶粒明显细化,表现为等轴晶区扩展,柱状晶长大受到抑制,同时力学性能亦有较大提升.另一方面,电脉冲孕育处理后的铝熔体具有较强的遗传性和抗衰退性,DSC测试揭示了采用电脉冲孕育处理的高纯铝试样在液相线以上存在物相改变.Electric Pulse Modification （EPM） is a novel technique that refines grain size by altering the structure of melt under the action of pulse electric field. The effect of EPM on solidified structure of pure aluminum was in vestigated in the paper. The effect of EPM offers an obvious effect of grain refining on the solidied strucvture of samples, moreover, their mechanical performance attains an obvious enhancement. On the other hand, the aluminum melt treated by EPM holds higher heredity and stronger resistance to gestated decline. Differential Scanning Calorimetry （DSC） analysis uncovers that the phase transformation occurs in the aluminum melt treated by EPM.

关 键 词：电脉冲孕育处理 纯铝 凝固组织 团簇 力学性能 

分 类 号：TG111.4[金属学及工艺—物理冶金]