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Production of namo-scaled multilayered materials produced by repeated press-rolling and formation of super high strength materials

反复压延成型纳米级多层材料的生产及超高强度材料

基本信息

批准号：
11450273
负责人：
OTSUKI Akira
金额：
$ 7.17万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11450273/
关键词：
metallic multilayer nanometer-ordered structure stacking structure strength repeated rolling GMR

项目摘要

Multilayers such as Fe/Cr, Co/Cu and Co/Ag have exhibited excellent giant magnetoresistance and have been fabricated by the well-controlled layer by layer deposition techniques. Instead of the layer by layer deposition methods, a totally different approach of sample fabrication, which utilizes the repeated pressing or rolling, has been successfully developed and applied to produce the layered nanometer-ordered structures from metal powders and sheets. By this sample preparation method, it is possible to produce metallic multilayers with the layer thickness in nanometer order in a bulk form. In this work, taking advantage of such bulk dimension of the sample prepared, results of the exploration of the mechanical, magnetoresistive and thermoelectric properties were reported.Bulk Fe/Ag and Fe/Cu multilayers with layer thickness of 10-20nm have been sucessfully fabricated by repeated press-rolling directed from a macroscopic stack of metal sheets.The mechanical strength of thin foil starting samples, as measured by tensile tests, was determined for samples of various layer thickness. The yield stress and ultimate strength increased with decreasing layer thickness. The yield stress versus layer thickness showed so called the Hall-Petch relation, the inverse-square-root dependence.

Fe/Cr、Co/Cu 和 Co/Ag 等多层膜表现出优异的巨磁阻，并通过良好控制的逐层沉积技术制备。取代逐层沉积方法，一种完全不同的样品制造方法，即利用重复压制或滚动，已成功开发并应用于从金属粉末和片材生产层状纳米有序结构。通过该样品制备方法，可以以块体形式制造层厚为纳米级的金属多层膜。在这项工作中，利用所制备样品的这种体积尺寸，报告了机械、磁阻和热电性能的探索结果。通过从宏观金属片叠层直接重复压延，成功地制备了层厚为10-20nm的块状Fe/Ag和Fe/Cu多层材料。通过拉伸测量薄箔起始样品的机械强度。测试，确定了不同层厚度的样品。屈服应力和极限强度随着层厚度的减小而增加。屈服应力与层厚度的关系显示出所谓的 Hall-Petch 关系，即反平方根依赖性。