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凝固和晶体生长来开发功能结构。（1）通过熔化和/或粗化快速凝固产生的非平衡结构来实现晶粒的晶体取向彼此对齐的织构结构。磁场下加工前的初始结构是织构结构的主导因素。(2)在解释粗化过程中织构结构形成的模型中，包括热力学，包括曲率效应和磁效应，以及扩散动力学。即，粗化是曲率效应与磁效应之间竞争的结果。模型预测的织构结构的形成与 Bi-Mn 体系的实验结果一致。模型还解释了顺磁性和反磁性材料在烧结过程中取向度的增加。(3)取向棒结构是由磁场下的单向凝固演化而来。例如，在超过4T的磁场下，Al-In合金获得了棒状排列结构。(4)还开发了利用交变磁场和静磁场的悬浮技术。通过使用该技术，研究了有利于纹理结构形成的等轴结构的形成作为凝固过程中对流的函数。

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。

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

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。

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