α-Al磁性对强磁场下Al-Cu亚共晶合金定向凝固组织的影响

doi:10.3969/j.issn.1007-2861.2013.07.022

上海大学学报(自然科学版) ›› 2014, Vol. 20 ›› Issue (4): 472-479.doi: 10.3969/j.issn.1007-2861.2013.07.022

α-Al磁性对强磁场下Al-Cu亚共晶合金定向凝固组织的影响

刘钱, 任忠鸣, 钟华, 李传军, 余建波

上海大学上海市现代冶金和材料制备重点实验室, 上海 200444

收稿日期:2013-09-27 出版日期:2014-08-25 发布日期:2014-08-25
通讯作者: 任忠鸣(1958—), 男, 教授, 博士生导师, 博士, 研究方向为金属凝固、电磁场下冶金与材料制备等. E-mail：zmren@shu.edu.cn E-mail:zmren@shu.edu.cn
作者简介:任忠鸣(1958—), 男, 教授, 博士生导师, 博士, 研究方向为金属凝固、电磁场下冶金与材料制备等. E-mail：zmren@shu.edu.cn
基金资助:
国家重点基础研究发展计划(973计划)资助项目(2011CB610404); 上海市科委重点资助项目(13521101102)

Influence of Magnetism of α-Al on Unidirectional Solidification Structure of Al-Cu Hypoeutectic Alloys in a Strong Magnetic Field

LIU Qian, REN Zhong-ming, ZHONG Hua, LI Chuan-jun, YU Jian-bo

Shanghai Key Laboratory of Modern Metallurgy & Materials Processing, Shanghai University, Shanghai 200444, China

Received:2013-09-27 Online:2014-08-25 Published:2014-08-25

摘要/Abstract

摘要： 以Al-Cu亚共晶合金为研究对象, 考察了 α-Al单晶磁各向异性对稳恒强磁场下定向凝固枝晶组织生长行为的影响. 实验测定了 α-Al单晶不同晶向的磁化率. 结果表明: Al-Cu单晶中的磁化现象表现出明显的方向性; 难磁化轴为晶体学位向<111>方向, 即磁化率最小; 易磁化轴为晶体学位向<311>或<310>方向, 即磁化率最大; 磁化率随Cu原子数量的增加而降低; [111]晶向族中4个晶向的磁化率不再一致. 对于Al-0.85%Cu合金, 当生长速度为50 μm/s时, 在无磁场情况下其定向凝固枝晶主干沿凝固方向排列; 当施加6 T纵向强磁场时, 枝晶主干偏离凝固方向成一定夹角排列, 这一现象可能是由 α-Al磁晶的各向异性所致.

关键词: Al-Cu合金, 定向凝固, 枝晶形貌, 磁晶各向异性

Abstract: This paper studies the effect of magnetic anisotropy of α-Al single crystal on the dendritic morphology in Al-Cu hypoeutectic alloy under a static high magnetic field during directional solidification. Magnetic susceptibility of α-Al single crystal slices with different crystal orientations are measured with the Faraday method. The results shows that the anisotropic and asymmetric magnetic property of the crystal cell of α-Al containing Cu. The <111>-crystal direction is a hard magnetization direction while <311> or <310>-crystal direction is an easy magnetization direction. Magnetic susceptibility decreases with increase of Cu content in α-Al. In addition, magnetic susceptibilities of the four crystal orientations among [111] are different. Besides, applying a 6 T longitudinal high magnetic field, the α-Al dendrite deviates from the heat flow direction, which is parallel to the solidification direction without a magnetic field at a growth speed of 50 μm/s.This phenomenon may be attributed to the crystal magnetic anisotropy energy of α-Al.

Key words: Al-Cu alloy, dendritic morphology, directional solidification, crystal magnetic anisotropy

中图分类号:

TG 146.2

刘钱, 任忠鸣, 钟华, 李传军, 余建波. α-Al磁性对强磁场下Al-Cu亚共晶合金定向凝固组织的影响[J]. 上海大学学报(自然科学版), 2014, 20(4): 472-479.

LIU Qian, REN Zhong-ming, ZHONG Hua, LI Chuan-jun, YU Jian-bo. Influence of Magnetism of α-Al on Unidirectional Solidification Structure of Al-Cu Hypoeutectic Alloys in a Strong Magnetic Field[J]. Journal of Shanghai University（Natural Science Edition）, 2014, 20(4): 472-479.

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α-Al磁性对强磁场下Al-Cu亚共晶合金定向凝固组织的影响

Influence of Magnetism of α-Al on Unidirectional Solidification Structure of Al-Cu Hypoeutectic Alloys in a Strong Magnetic Field

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