MA-Based Processing of Nano-structured intermaterials

首先对机械合金化中的混合、均匀化、细化和合金化过程进行了实验研究，确定了标准工艺条件。在这些基础研究中，对生产性机械合金化的相关工艺参数的可控性，这种BMA进行了描述。采用Cu-Ag、Cu-Co、Ag-Co、Ni-Al、Ti-Al等多种二元系，讨论了合金化过程中组元对固溶度的内在影响。特别是，BMA在Co-Cu体系中的精确研究，实现纳米颗粒化的Co团簇到铜基体中的巨磁电阻的改善，通过本方法。此外，Pb-Al和Bi-Al系统也被用来不仅证明如此韧性材料，永远不能机械合金化的常规铣削型MA应转化为Al纳米颗粒材料到Pb或Bi基体，但也实验描述的细化过程中的延性-延性系统。作为本方法在生产材料制备中的直接应用，以Bi-Sb-Te体系为例，实验证明，本方法可以在几个小时内合成出Bi_2Te_3和Sb_2Te_3化合物的固溶体，并将所得的固溶体块体温压成热电材料。值得注意的是，通过本方法可以获得与通过先进粉末冶金方法（PIES）获得的几乎相同的热电性能。最后，作者提出了自蔓延高温合成（SHS）可以通过MA在不同的过程中机械点火，并采用了不同的过渡金属硅体系，MA诱导SHS受到高形成自由能体系的青睐。

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.