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Research Article | Open Access

Effect of mechanical alloying on sinterability and phase evolution in pressure-less sintered TiB2‒TiC ceramics

Tian-Yi Hua, Mian-Yi Yaob,c, Dong-Li Hua, Hui Gua( ), Yu-Jin Wangb,c( )
Materials Genome Institute, School of Materials Science and Engineering, Shanghai University, Shanghai, 200444, China
Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, 150080, China
Key Laboratory of Advanced Structure, Function Integrated Materials and Green Manufacturing Technology, Ministry of Industry and Information Technology, Harbin Institute of Technology, Harbin, 150001, China

Peer review under responsibility of The Chinese Ceramic Society.

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Graphical Abstract

Abstract

Phase relation and microstructure evolution in the pressure-less sintered TiB2‒TiC ceramics preceded with mechanical alloying were systematically studied by a combination of SEM analysis. WC debris from milling balls promotes sintering by dissolving into the TiC phase to achieve dense microstructures at 1600 ℃. Variation of W solution in TiC grains exposes two types of core‒rim structures, with no or more W in dark and white cores respectively but with common medium W in both rims. Diminishing white-cores reveal an exchange reaction between WC and TiC via mechanical alloying to form the Ti1-zWzC phase prior to sintering. The dark-cores inherit from the as-milled TiC power to further enable the reprecipitation of rims from a mixed liquid-phase, which facilitated also the anisotropic growth of TiB2 grains. The dark-cores grow persistently in the second-step at 2000 ℃ enabled by this liquid-phase, which coarsens the TiB2 grains too. With more alloyed phase, sintering was insufficient at 1500 ℃ with only the surface fluidity from the primary powders, and the second-step sintering increased the fluidity in the liquid-phase to fully densify the binary microstructure. Re-distribution of the alloyed W by two-step sintering rationalizes the evolution process of the binary microstructures and leads to better understanding of the mechanical behaviors.

Keywords

TiB2‒TiC ceramicsMechanical alloyingCore‒rim structuresLiquid-phase sinteringMicrostructure‒Property relationship

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Journal of Materiomics
Volume 5 Issue 4,
December 2019
Pages 670-678
DOI: 10.1016/j.jmat.2019.05.001
Cite this article:
Hu T-Y, Yao M-Y, Hu D-L, et al. Effect of mechanical alloying on sinterability and phase evolution in pressure-less sintered TiB2‒TiC ceramics. Journal of Materiomics, 2019, 5(4): 670-678. https://doi.org/10.1016/j.jmat.2019.05.001

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Received: 21 February 2019
Revised: 25 April 2019
Accepted: 04 May 2019
Published: 11 May 2019
© 2019 The Chinese Ceramic Society. Production and hosting by Elsevier B.V.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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