摘要
考察了冷却速率、磁场强度及高梯度磁场对Al-2.89%Fle(质量分数)过共晶合金中Al_3Fe相形貌及分布规律的影响.结果表明,在无磁场条件下,初生Al_3Fe相沉积在试样下部;施加12T强磁场后,初生Al_3Fe相所受磁力作用和重力作用相平衡,在整个试样中均匀分布,且沿着易磁化方向[121]发生定向排列,其取向程度不受冷却速率的影响,但随着磁场强度的增大而加强;在高梯度磁场中,初生Al_3Fe相所受磁力作用大于重力作用而偏聚在试样的上部,且多个针状初生Al_3Fe相结合在一起,形成近似星状聚合体.此外,对强磁场的作用机理进行了分析和探讨.
The effects of cooling rate, magnetic intensity and high gradient magnetic field on the distribution and morphology of Al3Fe phase in Al2.89%Fe （mass fraction） alloy were studied. The results show that the primary Al3Fe phase with needle like morphology is gathered at the bottom of the sample due to the gravity force when the alloy is solidified without magnetic field. However, when a high magnetic field of 12 T is applied, the primary Al3Fe phase distributes throughout the sample homogeneously because that the magnetic force acted on the primary Al3Fe phase balances with the gravity force, and the primary Al3Fe phase aligns perpendicularly to the magnetic field direction with a preferred direction [121]. Its orientation extent is not affected by cooling rate, but strengthened with increasing magnetic intensity. When the sample is set at the position with a large positive gradient magnetic field, the magnetic force acted on the primary Al3Fe phase is greater than the gravity force, resulting in their segregation into the upper portion of the sample. Several needle-like primary Al3Fe phases are integrated to form the polymer with a star shape. Furthermore, the mechanism of high magnetic field was discussed.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第10期1224-1230,共7页
Acta Metallurgica Sinica
基金
国家自然科学基金项目50674030和50404007资助~~
关键词
AL-FE合金
Al3Fe相
强磁场
形态
分布
Al-Fe alloy, Al3Fe phase, high magnetic field, morphology, distribution
