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Role of Interphase Interface on Reaction Diffusion.

相间界面对反应扩散的作用。

基本信息

批准号：
03650529
负责人：
ONISHI Masami
金额：
$ 1.28万
依托单位：
Kyushu Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

项目摘要

Interfacial reaction and migration due to reaction diffusion in Cu - Zn, Fe - Zn, Au - Pt and Ag - Cu diffusion couples were investigated using multiple marker technique. After anneal of the couples Matano. Kirkendall and interphase interfaces were separately observed in the diffusion layers, and bend of the multiple marker array was observed at the interphase interface (i.i.). The bend indicates that the vacancies are formed or annihilated at the moving i.i. The atom shift between different kinds of the crystal lattices adjacent to each other at the i.i. mainly causes interfacial migration relative to the Matano coordinate system.The interfacial reaction, which can be called the phase transformation at the i.i., consists of two processes: one is the atom shift and the other is the arrival or departure of atoms resulting from formation or annihilation of the vacancies at the i.i. The reaction arises from discontinuity of the chemical potentials of components at the i.i. Because markers do not stay in the region where the vacancies are not conserved, intrinsic diffusion fluxes relative to marker fixed frame of reference can not be defined at the i.i.If the local equilibrium at the i. i. is valid. the reaction never proceeds. In this case the Kirkendall and interphase interfaces coincide with each other, and the Kirkendall markers move together with the i.i. Because the vacancies are not created or destroyed, intrinsic diffusion fluxes and also the chemical potentials are continuous at the i.i. An experimental result shows that interdiffusion coefficients at the i.i. vary in magnitude, depending on whether the reaction proceeds or not.

用多标记技术研究了Cu - Zn、Fe - Zn、Au - Pt和Ag - Cu扩散偶中的界面反应和反应扩散迁移。又野夫妇退火后。在扩散层中分别观察到Kirkendall界面和相间界面，在相间界面（i.i.）处观察到多标记阵列的弯曲。弯曲表明空位在移动的i.i.原子在不同种类的晶格之间的移动彼此相邻的i.i.主要引起相对于Matano坐标系的界面迁移。界面反应，可以称为i. i.处的相变，由两个过程组成：一个是原子移动，另一个是由于i. i处空位的形成或湮灭而导致的原子的到达或离开。该反应是由于组分在i. i.由于标记物不停留在空位不守恒的区域，因此在i. i处不能定义相对于标记物固定参照系的内禀扩散通量。I.是有效的。反应从未进行。在这种情况下，Kirkendall界面和相间界面彼此重合，并且Kirkendall标记与i.i.由于空位没有产生或被破坏，因此本征扩散通量和化学势在i. i.实验结果表明，在i.i.取决于反应是否进行。