Study on Phase Transformations for New Materials and under Special Conditions

新材料及特殊条件下的相变研究

基本信息

批准号：
09242104
负责人：
NITTONO Osamu
金额：
$ 61.63万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research on Priority Areas
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

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

对非晶合金、沸石簇等新材料的相变特性进行了研究，并在各种具体情况下完成了约80%的研究，主要结果如下。如下：（1）理解特定情况下相变的实验和理论方法，HONO博士研究了原子尺度的纳米复合材料类型的相变；寺崎博士证明了铜和铌等一些杂质对软磁性能起着重要作用，并提出了制造新型软材料的新概念，通过结合 X 射线衍射和电子显微镜检查了各种沸石中的晶体结构。 (2)多层材料等人工制造材料的材料性能松井博士研究了含有铁元素的人工多层膜的磁特性，并提出了一个新模型来解释亚稳态面心立方和体心立方铁相的相稳定性。NITTONO博士研究了各种难以形成的亚稳态相。热力学上，并证明了在等离子体状态下可以通过溅射轻松制备各种亚稳态相和合金，并且各种类型的相变适用于实际材料的改进。 (3)非晶合金和准晶相变的非晶到晶型的分析；INO博士研究了含Sm元素的非晶合金的磁性能，并成功地解释了温度下磁相变的机理。 HIROTSU将电子衍射、径向分布分析和结构模拟方法相结合，开发了新型非晶合金分析技术，并应用于一些研究人员还相互合作，阐明了相分离初始阶段的机理，并从这项研究中获得了许多适用且有用的新知识。