Enhanced toughness and stable crack propagation in a novel tungsten fibre-reinforced tungsten composite produced by chemical vapour infiltration
Enhanced toughness and stable crack propagation in a novel tungsten fibre-reinforced tungsten composite produced by chemical vapour infiltration
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DOI：
10.1088/0031-8949/2014/t159/014031
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发表时间：
2014-04
期刊：
影响因子：
2.9
通讯作者：
Johann Riesch;T. Höschen;C. Linsmeier;S. Wurster;J. You
中科院分区：
文献类型：
--
作者：
Johann Riesch;T. Höschen;C. Linsmeier;S. Wurster;J. You
钨是未来聚变反应堆面向等离子体组件的一种很有前途的候选材料，但其固有的脆性严重限制了它的使用。一个解决这一问题的创新概念是钨纤维增强钨复合材料。在这篇文章中，我们介绍了这种复合材料的第一次力学测试，使用的是含有多种纤维的样品。在扫描电子显微镜下进行了原位断裂实验，以密切观察裂纹的扩展情况。随着承载能力的提高，裂纹扩展稳定。利用试验结果和表面观察对断裂韧性进行了估算。
Tungsten is a promising candidate for the plasma-facing components of a future fusion reactor, but its use is strongly restricted by its inherent brittleness. An innovative concept to overcome this problem is tungsten fibre-reinforced tungsten composite. In this paper we present the first mechanical test of such a composite material using a sample containing multiple fibres. The in situ fracture experiment was performed in a scanning electron microscope for close observation of the propagating crack. Stable crack propagation accompanied with rising load bearing capacity is observed. The fracture toughness is estimated using the test results and the surface observation.