Rapid in-situ reaction synthesis of novel TiC and carbon nanotubes reinforced titanium matrix composites

doi:10.1016/j.jmst.2017.07.005

Abstract

Abstract:

In-situ TiC and remained multi-walled carbon nanotubes (MWCNTs) reinforced Ti composites were synthesized using vacuum hot-press sintering and hot rolling. The effect of weight fraction of MWCNTs on microstructural evolution and mechanical properties of the Ti composites was investigated. The results indicated that both proportion and particle size of TiC increased in proportion to MWCNTs content, which resulted in different matrix microstructure, and the grains were obviously refined after rolling deformation. The hardness tests indicated that MWCNTs addition could make the composites harden, and 18.4% improvement in hardness was obtained after hot rolling. The significant improvement in both strength and hardness could be attributed to grain refinement, solid solution strengthening of carbon and dispersion strengthening of TiC particles and remained MWCNTs. A good combination of strength and ductility were achieved in Ti-1 wt% MWCNTs composites, which were in accordance with the uniform distribution of smaller-sized TiC particles in Ti matrix.

Key words: Titanium matrix composites, CNTs, Powder metallurgy, Hot-rolling

Sun Xianglong, Han Yuanfei, Cao Sanchen, Qiu Peikun, Lu Weijie. Rapid in-situ reaction synthesis of novel TiC and carbon nanotubes reinforced titanium matrix composites[J]. J. Mater. Sci. Technol., 2017, 33(10): 1165-1171.

Figures/Tables 9

Fig. 1. Schematic of hot rolling process of TiC/Ti composites.

Fig. 2. SEM micrographs of composite powders after ball milling of Ti-1 wt% MWCNTs (a, b), Ti-2 wt% MWCNTs (c, d), Ti-4 wt% MWCNTs (e, f) at low (a, c, e) and high (b, d, f) magnification.

Fig. 3. SEM micrograph of short rod-shaped particles of milled composite powders (a) and EDS results of particle 1 (b) and particle 2 (c).

Fig. 4. Schematic illustration for distribution of Ti powders and MWCNTs after ball milling.

Fig. 5. Optical micrographs of as-sintered specimens: (a) pure Ti; (b) Ti-1 wt% MWCNTs; (c) Ti-2 wt% MWCNTs; (d) Ti-4 wt% MWCNTs.

Fig. 6. Optical micrographs of hot-rolled specimens: (a) pure Ti; (b) Ti-1 wt% MWCNTs; (c) Ti-2 wt% MWCNTs; (d) Ti-4 wt% MWCNTs (The insets present bulk shape of specimens after hot rolling; RD: rolling direction).

Fig. 7. SEM micrographs of hot-rolled specimens: (a) pure Ti; (b) Ti-1 wt% MWCNTs; (c) Ti-2 wt% MWCNTs; (d) Ti-4 wt% MWCNTs.

Fig. 8. (a) Calculation of index n based on the tensile stress strain curves in previous study [32] and (b) comparison of mechanical properties for as-sintered and hot-rolled specimens.

Fig. 9. SEM micrographs of as-sintered specimens: (a) pure Ti; (b) Ti-1 wt% MWCNTs; (c) Ti-2 wt% MWCNTs; (d) Ti-4 wt% MWCNTs; (e) remained MWCNTs in voids.

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