Journal of Nuclear Energy Science & Power Generation TechnologyISSN: 2325-9809

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Research Article, J Nucl Ene Sci Power Generat Technol Vol: 5 Issue: 4

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

Laima Luo1,3*, Jingbo Chen1, Shuang Wang1, Guangnan Luo2, Xiaoyong Zhu1,3, Jigui Cheng1,3 and Yucheng Wu1,3
1School of Materials Science and Engineering, Hefei University of Technology, Hefei, China
2Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, China
3National–Local Joint Engineering Research Centre of Nonferrous Metals and Processing Technology, Hefei, China
Corresponding author : Laima Luo
School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China
Tel: +86 551 62901012
E-mail: [email protected]
Received: April 18, 2016 Accepted: June 03, 2016 Published: June 07, 2016
Citation: Luo L, Chen J, Wang S, Luo G, Zhu X, et al. (2016) Influence of Niobium Content on the Microstructure and Properties of W–Nb/TiC Composites Prepared by Conventional Sintering. J Nucl Ene Sci Power Generat Technol 5:4. doi:10.4172/2325-9809.1000157

Abstract

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 microhardness did not change significantly with the increased Nb content of the W–Nb/TiC composites.

Keywords: W–Nb/TiC composites; Conventional sintering; (Nb,Ti)C; Nb2C; Impact energy

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