超磁致伸缩材料及其在航空航天工业中的应用

MAGNETOSTRICTIVE MATERIAL AND ITS APPLICATION IN AERONAUTIC AND ASTRONAUTIC INDUSTRIES

介绍了超磁致伸缩材料在国内外发展状况 ,系统地比较了该材料各种制备方法的优缺点及其适用领域 ,采用真空感应熔炼和真空区熔定向凝固方法制备出 Tb0 .3Dy0 .7Fe1 .95 超磁致伸缩合金 ,用 X-射线及光学金相分析了该合金的凝固组织形貌、微观结构和晶体择优生长方向。结果表明 ,该合金的铸态组织为树枝状的Mg Cu2 型 ( Tb,Dy) Fe2 和富稀土相两相结构。本实验条件下 ,该合金定向凝固形态为胞状晶和树枝晶 ,其晶体生长择优取向分别为〈1 1 0〉和〈1 1 2〉方向。

The development of the giant magnetostrictive materials magnetostrictive alloy was introduced. The methods of the fabrication for the materials were compared. Tb 0.3 Dy 0.7 Fe 1.95 was prepared by vacuum induction melting and zone melting unidirectional solidification methods. The solidified morphologies, microstructure and the preferred orientations were measured by the optical microscopy and X\|ray diffraction analysis. The results indicate that the alloy possesses two phases including MgCu 2 type(Tb,Dy)Fe 2 and rare earth phase. The solidified morphologies were cell and dendrite and their preferred orientations were 〈110〉 and 〈112〉, respectively. The application of the materials in aeronautic and astronautic industries was analyzed.