Study on Phase Transformations for New Materials and under Special Conditions

研究了非晶态合金、沸石团簇等新材料的相变特性，以及在各种特定条件下的相变特性。约80%的初始项目计划成功完成。该研究针对三名受试者进行。主要结果如下：（1）在特定条件下理解相变的实验和理论方法; HONO博士在原子尺度上研究了纳米复合型软磁材料的相变初始阶段，证明了铜和铌等杂质对软磁性能起着重要作用，并提出了制造新型软磁材料的新概念。寺崎博士通过X射线衍射和电子显微镜检查了各种沸石的晶体结构，并演示了通过控制微观-介观空间结构来制造新型材料的新概念。（2）材料性能 ...更多信息 s在人工制造的材料，如多层膜和亚稳相;松井博士研究了含铁元素的磁性多层膜的磁性，并提出了一个新的模型来解释亚稳fcc和bcc铁相的相稳定性。NITTONO博士对热力学上难以形成的各种亚稳相进行了研究，证明了在等离子体状态下通过溅射可以容易地制备出各种亚稳相和合金，各种类型的相变适用于实际材料的改进。（3）分析了非晶态合金和准晶态合金的非晶-晶相变类型：INO博士研究了含Sm非晶态合金的磁性，成功地解释了温度相变的机理。广津博士将电子衍射、径向分布分析和结构模拟方法相结合，开发了新型的非晶合金分析技术，并应用于非晶软磁材料的微观结构分析。一些研究者还相互合作，阐明了相分离初期的机理。通过本研究也获得了许多实用的、有用的新知识。少

The characteristics of phase transformations have been invsestigated for new materials such as amorphous alloys and zeolite clusters, and also under various specific circumstances. About 80% of initial project planes was done in successfully. The study was done for three subjects. Main results are as follows : (1) Experimental and theoretical appoaches for understanding of phase transformations under specific circumstances ; Dr.HONO studied initial stages of phase transformations in nano-composite types of soft magnetic materials in atomic scale, and demonstrtaed that some impurities such as copper and niobium play an important role for soft magnetic properties and proposed a new concept to fabricate new types of soft materials. Dr.TERASAKI examined crystal structures in various zeolites by a combination of X-ray diffraction and electron microscopy, and also demostrated a new concept to fabricate new types of materials by controlling micro-meso spacial structures. (2)Material propertie … More s in artificially fabricated materials such as multilayers and metastable phases ; Dr.MATSUI examined the magnetic properties of arificial multilayer films containing iron element, and proposed a new model to explain the phase stability of metastable fcc and bcc iron phases. Dr.NITTONO examined various metastable phases which are hard to be formed thermodymanically, and demostrated that various metastable phases and alloys are easily fabricated under plasma states by sputtering, and various types of phase transformations are applicable to the improvement of practical materials. (3)Analysis of non-crystal to crystal types of phase transformations in amorphous alooys and quaisi-crystals ; Dr.INO examined magnetic properties of amorphous alloys containing Sm element, and explained successfully the mechanism of magmetic transformation in terms of temperature. Dr.HIROTSU developped new types of analytical techniques for amorphous alloys by the combination of electron diffraction, radial distribution analysis and structursl simulation method, and applied to the analysis of microstructures in amorphous soft magnetic materials. Some of researchers also collaborated with each other to elucidate the mechanism of the initial stage of phase separation. A lot of new knowledges which are applicable and useful were also obtained from this study. Less