电磁搅拌和细化剂对Al-Mg-Mn合金组织的影响  

Effects of Electromagnetic Stirring Combined with Refiner on Microstructure of Al-Mg-Mn Alloy

作　　者：左玉波[1] 崔建忠[1] 赵志浩[1] 王向杰[1] 朱庆丰[1] 屈福[1] 涂赣峰[2] 

机构地区：[1]东北大学材料电磁过程研究教育部重点实验室 [2]东北大学材料与冶金学院

出　　处：《特种铸造及有色合金》2008年第8期581-583,共3页Special Casting & Nonferrous Alloys

基　　金：国家重点基础研究发展计划(973计划)资助项目(2005CB623707);高等学校学科创新引智计划资助项目(B07015)

摘　　要：研究了电磁搅拌和细化剂对铝合金铸态组织的影响。结果表明,电磁搅拌对晶粒尺寸具有显著细化作用,电磁搅拌作用下,细化剂对Al-Mg-Mn合金晶粒组织仍然具有重要影响,随着细化剂含量的增加晶粒愈加细小。在试验范围内,当细化剂含量为0.1%时,组织最为均匀细小。采用耐火材料铸模制备铸锭并在凝固过程连续测温,探讨了电磁搅拌对组织的细化机理。根据温度测量结果,可以认为电磁搅拌对组织的细化作用主要在于熔体流动使温度场趋于均匀,并促进了晶核的形成和游离。Effects of electromagnetic stirring combining with refiner modification on microstructure of Al-Mg-Mn alloy were observed by SEM (scanning electron microscope), XRD (X-ray diffraction). The results reveal that the grain size in the alloy is obviously refined by electromagnetic stirring. The refiner has positive effects on the structure in the alloy in process of electromagnetic stirring, where the grain size becomes more and more refine with increasing in refiner addition and desirable grain size in the alloy can be observed with 0.1% refiner addition. Refining mechanism of electromagnetic stirring was approached by continuously temperature-measuring during solidification process of alloy in mould with refractory materials. It is believed that the electromagnetic stirring results in the appearance of forced convection in the melt and therefore promote the formation and fragmentation of nuclei, which are responsible for the refinement of grain size in the alloy.

关 键 词：电磁搅拌 细化剂 冷却速率 组织 铝合金 

分 类 号：TG146.21[一般工业技术—材料科学与工程]