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首页> 外文期刊>Scripta materialia >SPACE CHARGE AND THE DEPENDENCE OF THE FLOW STRESS OF CERAMICS ON AN APPLIED ELECTRIC FIELD
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SPACE CHARGE AND THE DEPENDENCE OF THE FLOW STRESS OF CERAMICS ON AN APPLIED ELECTRIC FIELD

机译：电场作用下陶瓷的空间电荷与流变应力的关系

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摘要

It has been recognized for some time that a space-charge exists at interfaces in ionic solids (9). In view of this, it has been pointed out by Jamnik and Raj (5) that the electric potential associated with the space-charge needs to be included in the electrochemical potential pertaining to the vacancies in such materials. Support for this concept was provided by the specially designed compression tests performed by Pannikkat and Raj (6). The present analysis for fine-grained Al_2O_3 and that previously for MgO (4) show for the first time that the reduction in flow stress of ionic materials which occurs with the application of an electric field during plastic deformation at high homologous temperatures can be attributed to a reduction in the electrochemical potential of the vacancies pertaining to the diffusion of the rate-controlling ionic species. Based on this concept, it is expected that an applied electric field will also have an influence on other diffusion-controlled phenomena in ionic solids, such as creep, bonding and sintering, grain growth and phase transformations. In addition to the potential technological benefits which might then accrue from the use of electric fields in the processing of ceramics, experiments similar to those described here have scientific importance in that they provide a means for determining the magnitude of the space-charge and its width.
机译：一段时间以来，人们已经认识到在离子固体（9）的界面处存在空间电荷。有鉴于此，Jamnik和Raj（5）指出，与空间电荷相关的电势需要包含在与此类材料中的空位有关的电化学电势中。 Pannikkat和Raj（6）专门设计的压缩测试为这一概念提供了支持。目前对细颗粒Al_2O_3和以前对MgO的分析（4）首次表明，在高同源温度下塑性变形过程中施加电场会导致离子材料的流应力降低。降低了与速率控制离子物质扩散有关的空位的电化学势。基于此概念，可以预期施加的电场还将影响离子固体中其他扩散控制的现象，例如蠕变，键合和烧结，晶粒生长和相变。除了在陶瓷加工中使用电场可能会带来潜在的技术利益外，与此处所述类似的实验也具有科学重要性，因为它们为确定空间电荷的大小及其宽度提供了一种手段。 。

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