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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。同时介绍了超型磁致伸缩材料在航空航天工业中的应用前景
The development status of giant magnetostrictive material at home and abroad was introduced. The advantages and disadvantages of various preparation methods of this material and their applicable fields were systematically compared. Tb0.3Dy0.7Fe1 was prepared by vacuum induction melting and directional solidification in the vacuum zone. 95 Giant Magnetostrictive Alloy, the solidified microstructure, microstructure and preferred growth direction of the alloy were analyzed by X-ray and optical metallography. The results show that the as-cast microstructure of the alloy is a dendritic Mg Cu2 type (Tb, Dy) Fe2 and a rare earth rich two phase structure. Under the experimental conditions, the directional solidification morphology of the alloy is cellular and dendritic, and the preferred orientation of the crystal growth is <1 1 0> and <1 1 2> directions, respectively. At the same time introduced the application of super magnetostrictive materials in the aerospace industry