Al-5%Si合金电磁铸造凝固组织的EBSD研究  

Investigation on the nucleation mechanism of Al-5%Si Alloy under electromagnetic field by EBSD

作　　者：张志清[1,2] 刘伟[2] 李丘林[3] 刘庆[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044 [2]清华大学材料科学与工程系,北京100084 [3]清华大学深圳研究生院,广东深圳518055

出　　处：《电子显微学报》2009年第1期11-14,共4页Journal of Chinese Electron Microscopy Society

基　　金：国家自然科学基金资助项目(No.50474048)~~

摘　　要：在金属凝固过程中施加电磁场可以有效地改善细化铸坯凝固组织,促进凝固组织中晶粒等轴化转变。目前研究主要集中于电磁场条件下合金熔体中温度、浓度场的改变及晶体类型转变、晶粒尺寸的改变。电磁场条件下液态金属形核及长大机理方面的研究还不深入。EBSD取向测量技术由于具有测定速度快、分辨率高,试样制备简单的特点而得以广泛应用,本研究利用EBSD取向测量技术揭示了Al-Si亚共晶合金电磁场条件下的凝固机理。The application of electromagnetic field （FMF） during the solidification can refine the microstructure and induce the columnar to equiaxed transition （CET）. Most of the study on the effects of EMF focused on the changes of heat-field, concentration-field and also the transition of microstructure. The nucleate and growth mechanism of metal when applied by the EMF is not investigated enough for understanding the effects of EMF. EBSD technique is widely used in the because of its fast index speed, high resolution and easy simple preparation. In this study the EBSD technique is used to investigate the nucleation mechanism of Al-5%Si alloy under an EMF.

关 键 词：EBSD 电磁场 亚共晶 凝固机理 

分 类 号：TG136.1[一般工业技术—材料科学与工程] TG146.21[金属学及工艺—合金]