Grain refinement of pure aluminum by direct current pulsed magnetic field and inoculation  

直流脉冲磁场和孕育处理共同作用下纯铝的细化(英文)

作　　者：陈航[1] 接金川[1] 付莹[1] 马红军[1] 李廷举[1] 

机构地区：[1]大连理工大学材料科学与工程学院,大连116023

出　　处：《Transactions of Nonferrous Metals Society of China》2014年第5期1295-1300,共6页中国有色金属学报（英文版）

基　　金：Projects(51074031,51271042,50874022)supported by the National Natural Science Foundation of China;Project(2013M530913)supported by the China Postdoctoral Science Foundation;Project(DUT12RC(3)35)supported by the Fundamental Research Funds for the Central Universities of China

摘　　要：The combined effects of direct current pulsed magnetic field （DC-PMF） and inoculation on pure aluminum were investigated, the grain refinement behavior of DC-PMF and inoculation was discussed. The experimental results indicate that the solidification micro structure of pure aluminum can be greatly refined under DC-PMF. Refinement of pure aluminum is attributed to electromagnetic undercooling and forced convection caused by DC-PMF. With single DC-PMF, the grain size in the equiaxed zone is uneven. However, under DC-PMF, by adding 0.05% （mass fraction） Al5Ti-B, the grain size of the sample is smaller, and the size distribution is more uniform than that of single DC-PMF. Furthermore, under the combination of DC-PMF and inoculation, with the increase of output current, the grain size is further reduced. When the output current increases to 100 A, the average grain size can decrease to 113 μn.研究直流脉冲磁场和孕育处理共同作用对纯铝凝固组织的影响,探讨直流脉冲磁场和孕育处理的共同作用的细化行为。结果表明:直流脉冲磁场能够显著细化纯铝凝固组织。纯铝的细化主要是由直流脉冲产生的电磁过冷和强制对流引起的。然而只在直流脉冲作用下,等轴晶区域的晶粒尺寸分布不均匀。在施加直流脉冲磁场的基础上加入质量分数为0.05%的Al-5Ti-B,晶粒尺寸更加细小,并且整个等轴晶区域的晶粒尺寸分布比较均匀;随着输出电流的增加,平均晶粒尺寸减小,当脉冲电源的输出电流增加到100 A时,平均晶粒尺寸减小到113μm。

关 键 词：direct current pulsed magnetic field pure aluminum inoculation grain refinement solidification micro structure 

分 类 号：TG292[金属学及工艺—铸造]