Development of the functional structures by the solidification under a magnetic field

通过磁场下凝固开发功能结构

• 批准号: 15560643
• 负责人: YASUDA Hideyuki
• 金额: $ 2.18万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560643/
• 关键词: Magneto-science; Solidification; Crystal growth; textured structure; Alignment; High magnetic field; Crystal magnetic anisotropy; Coarsening; 強磁場科学; 配向組織; 集合組織; 固相変態; 磁気効果; 配向; 半溶融; レーザ加熱; 非平衡

This project aims to develop the functional structures though the solidification and the crystal growth under a magnetic field.(1) The texture structure, in which the crystallographic orientation of the grains are aligned each other, was achieved by melting and / or coarsening the nonequilibrium structure produced by the rapid solidification. The initial structure before processing under a magnetic field is a dominant factor for the texture structure.(2) In the model that explains the formation of the textured structure during the coarsening, the thermodynamics, including the curvature effect and the magnetic effect, and the kinetics by the diffusion are included. Namely, the coarsening occurs as a result of competition between the curvature effect and the magnetic effect. The formation of the textured structure predicted by the model agreed with the experimental results for the Bi-Mn system. The increase in the alignment during the sintering for the paramagnetic and the diamagnetic materials was also explained by the model.(3) The ligned rod structure was evolved by the unidirectional solidification under a magnetic field. For example, the rod aligned structure was obtained in the Al-In alloys under a magnetic field exceeding 4T.(4) The levitation technique using the alternating and the static magnetic fields was also developed. By using the technique, the formation of the equiaxed structure, which is favorable for the textured structure formation, was examined as a function of the convection during the solidification.

该项目旨在通过磁场下的固化和晶体生长来发展功能结构。（1）通过熔化和 /或使快速固化产生的非平衡结构融化和 /或使晶粒的晶体方向相互对齐，质地结构相互对齐。在磁场下处理之前的初始结构是纹理结构的主要因素。（2）在模型中解释了在块状过程中形成纹理结构的形成，包括曲率效应和磁效应，以及扩散的动力学。也就是说，由于曲率效应与磁效应之间的竞争，这种变形发生。模型预测的纹理结构的形成与BI-MN系统的实验结果一致。该模型还解释了顺磁性和磁管材料的烧结过程中的比对增加。（3）磁场结构在磁场下的单向固化进化。例如，在超过4T的磁场下，在AL-IN合金中获得了杆对齐结构。（4）也开发了使用交流和静态磁场的悬浮技术。通过使用该技术，在凝固过程中检查了对纹理结构形成的尤用结构的形成，这是对流的函数。

项目成果

H.Yasuda: "New eutectic ceramics"Materials Transaction. 44/10. 2207-2212 (2003)

H.Yasuda：《新型共晶陶瓷》材料交易。

Formation of crystallographically aligned BiMn grains by semi-solid processing of rapidly solidified Bi-Mn alloys under a magnetic field

• DOI: 10.2320/matertrans.44.2207
• 发表时间: 2003-10-01
• 期刊: MATERIALS TRANSACTIONS
• 影响因子: 1.2
• 作者: Yasuda, H;Ohnaka, I;Kishio, K
• 通讯作者: Kishio, K

Levitation of metallic melt by using the simultaneous imposition of the alternating and the static magnetic field

同时施加交变磁场和静磁场使金属熔体悬浮

• 发表时间: 2004
• 期刊: Journal of Crystal Growth 260
• 作者: H.Yasuda;I.Ohnaka;R.Ishii;S.Fujita;Y.Tamura;H.Yasuda;H.Yasuda
• 通讯作者: H.Yasuda

H.Yasuda: "Alignment of BiMn Crystal Orientation in Bi-20at%Mn alloys by Laser Melting under a Magnetic Field"Materials Transaction. 44/12. 2550-2554 (2003)

H.Yasuda：％20“对准％20of％20BiMn％20晶体％20取向％20in％20Bi-20at％Mn％20合金％20by％20激光％20熔化％20under％20a％20磁性％20Field”材料％20交易。％2044/12。

Effect of Melt Flow on Solidified Structures of Middle Carbon Steel

熔体流动对中碳钢凝固组织的影响

• 发表时间: 2006
• 期刊: Proceedings of 5th International Symposium on Electromagnetic processing of Materials
• 作者: I.Katayama;T.Matsui;T.Oishi;安田秀幸;H.Yasuda
• 通讯作者: H.Yasuda