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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Does grain size have an influence on intrinsic mechanical properties and conduction mechanism of near fully-dense boron carbide ceramics?
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Does grain size have an influence on intrinsic mechanical properties and conduction mechanism of near fully-dense boron carbide ceramics?

机译：粒度是否对近致密硼碳化物陶瓷的固有机械性能和传导机制有影响？

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摘要

This work is concentrated on getting a reply to the following question: how does the grain size of boron carbide specimens influence on their mechanical and electrical response? It is a common issue that both essential properties are usually affected by the grain boundaries. To this purpose, a set of near fully-dense boron carbide specimens were prepared by spark plasma sintering. In order to reduce residual porosity and grain-size effects, nanoindentation tests at room temperature were conducted. DC conductivity was measured through four-point test technique from room temperature up to 800 degrees C. The results show that hardness can reach values as high as similar to 60 GPa and plasticity onset takes place at around 23 GPa by dislocation nucleation. Regarding the conductivity, it is found that grain boundaries can block the mobility of bipolarons in an effective way. A simple additive law is provided to account for the resistivity of boron carbide polycrystals. (C) 2019 Elsevier B.V. All rights reserved.
机译：这项工作集中在接受以下问题的回复：硼碳化物标本的粒度如何影响其机械和电气响应？这是一个常见的问题，即所有基本属性通常受谷物边界的影响。为此目的，通过火花等离子体烧结制备一组近全密集的碳化硼样品。为了减少残留的孔隙率和晶粒尺寸效应，进行室温下的纳米凸缘试验。通过从室温高达800℃的四点测试技术测量DC电导率。结果表明，硬度可以高达相似的值，与60GPa相似，通过位移成核，塑性发作发生在约23个GPA。关于电导率，发现晶界可以以有效的方式阻断双极的迁移率。提供简单的添加剂法以考虑碳化硼多晶的电阻率。 （c）2019 Elsevier B.v.保留所有权利。

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