Laima Luo Author

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Influence of Niobium Content on The Microstructure and Properties of W–Nb/TiC Composites Prepared by Conventional Sintering

Author(s):

Laima Luo, Jingbo Chen, Shuang Wang, Guangnan Luo, Xiaoyong Zhu, Jigui Cheng, Yucheng Wu

W–Nb/TiC composites were prepared by mechanical milling and conventional sintering. Field-emission scanning electron microscopy, high-resolution transmission electron microscopy, microhardness, and Charpy impact test analyses were used to characterize the samples. Results showed that W–1wt%Nb/TiC exhibited the maximum relative density (94%) and impact energy (116 KJ/m²) and that (Nb, Ti) C solid solution and Nb2C formed in the W–Nb/TiC composites. However, the density and impact energy decreased when the Nb content exceeded 1 wt% because the second-phase particles agglomerated at the grain boundaries (GBs) with increased Nb content. This agglomeration caused stress concentration of the GBs, which easily initiated cracks. The micr... view more»

DOI: 10.4172/2325-9809.1000157

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