Alignment of primary Al_3Ni phases in hypereutectic Al-Ni alloys with various compositions under high magnetic fields  

作　　者：WANG Qiang, WANG ZhongYing, LIU Tie, WANG ChunJiang, ZHANG Chao & HE JiCheng Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University, Shenyang 110004, China 

出　　处：《Science China(Technological Sciences)》2009年第4期857-863,共7页中国科学（技术科学英文版）

基　　金：Supported by the National Natural Science Foundation of China (Grant No. 50374027);the Program for New Century Excellent Talents in University (Grant No. NECT-06-0289) ;the 111 Project (Grant No. B07015)

摘　　要：Al-Ni hypereutectic alloys with various compositions were solidified under various magnetic field con- ditions to investigate the alignment of primary Al3Ni phases. The results showed that the application of high magnetic fields could improve the homogeneity of the primary Al3Ni phase distribution and induce the alignment of primary Al3Ni phases in the direction perpendicular to the magnetic field direction to form chain-like structures. However, the alignment was different from the orientation of the Al3Ni phases. Furthermore, the degree of the alignment decreased with the increasing concentration of Ni element. This can be attributed to the combination effects of high magnetic field and alloy composition on the concentration field around the crystallized primary Al3Ni crystals.Al-Ni hypereutectic alloys with various compositions were solidified under various magnetic field con- ditions to investigate the alignment of primary Al3Ni phases. The results showed that the application of high magnetic fields could improve the homogeneity of the primary Al3Ni phase distribution and induce the alignment of primary Al3Ni phases in the direction perpendicular to the magnetic field direction to form chain-like structures. However, the alignment was different from the orientation of the Al3Ni phases. Furthermore, the degree of the alignment decreased with the increasing concentration of Ni element. This can be attributed to the combination effects of high magnetic field and alloy composition on the concentration field around the crystallized primary Al3Ni crystals.

关 键 词：high magnetic FIELDS alloy composition PRIMARY Al3Ni phase ALIGNMENT SOLIDIFICATION 

分 类 号：TG146.21[一般工业技术—材料科学与工程]