权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

MA-Based Processing of Nano-structured intermaterials

基于MA的纳米结构中间材料加工

基本信息

批准号：
07555512
负责人：
KIHARA Junji
金额：
$ 3.26万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

Mixing and homogenization, refining and alloying processes in the bulk mechanical alloying (BMA) by the repeated MA-forging were first experimentally investigated to define the standard process condition. In these fundamental studies, controllability of the related process parameters to this BMA was described towards productive mechanical alloying. Various binary systems such as Cu-Ag, Cu-Co, Ag-Co, Ni-Al, Ti-Al and so forth were employed to discuss the intrinsic effect of constituent elements on the solid solubility in the alloying processes. In paticular, BMA in the Co-Cu system was precisely studied to realize nano-particulation of Co clusters into Cu matrix for improvement of giant magneto-resistance by the present method. In addition, Pb-Al and Bi-Al systems were also employed not only to demonstrate so ductile materials as can never be mechanically alloyed by the conventional milling-type MA should be converted into Al nano-particulate materials into Pb or Bi matrices but also to experimentally describe the refining process in the ductile-ductile system. As the direct application of the present approach to productive materials processing, Bi-Sb-Te system was employed to experimentally demonstrate that the solid solution of Bi_2Te_3 and Sb_2Te_3 compounds can be synthesized by the present method within a couple of hours and to obtain the thermoelectric materials by warm-pressing the yielded solid solution bulk compact. To be noted, nearly the same thermoelectric properties as attained by the advanced powder metallurgical method (PIES) can be obtained by the present method. Finally, Authors proposed that SHS can be ignited mechanically through MA in the different process from thermally-induced SHS.Various transition metal silicon systems were employed that MA-induced SHS is favored by the high formation free energy systems.

首先通过实验研究了通过重复 MA 锻造进行的块体机械合金化 (BMA) 中的混合和均质化、精炼和合金化过程，以确定标准工艺条件。在这些基础研究中，描述了该 BMA 相关工艺参数的可控性，以实现高效的机械合金化。采用Cu-Ag、Cu-Co、Ag-Co、Ni-Al、Ti-Al等多种二元体系来讨论合金化过程中组成元素对固溶度的内在影响。特别是，对Co-Cu体系中的BMA进行了精确研究，以实现Co团簇纳米颗粒化到Cu基体中，从而通过本方法改善巨磁阻。此外，还采用Pb-Al和Bi-Al体系，不仅证明了传统铣削型MA无法机械合金化的延性材料应将Al纳米颗粒材料转化为Pb或Bi基体，而且还通过实验描述了延性-延性体系中的精炼过程。作为该方法在生产性材料加工中的直接应用，采用Bi-Sb-Te体系通过实验证明了该方法可以在几个小时内合成Bi_2Te_3和Sb_2Te_3化合物的固溶体，并通过对所得固溶体块体进行温压来获得热电材料。值得注意的是，通过本方法可以获得与先进粉末冶金方法（PIES）几乎相同的热电性能。最后，作者提出，SHS可以通过MA以与热诱导SHS不同的过程进行机械点燃。采用了各种过渡金属硅体系，MA诱导的SHS受到高形成自由能体系的青睐。