High-temperature properties of extruded titanium composites fabricated from carbon nanotubes coated titanium powder by spark plasma sintering and hot extrusion

TLDR: In this article, a pure titanium matrix composite reinforced with carbon nanotubes (CNTs) was prepared by spark plasma sintering and hot extrusion via powder metallurgy process.

About: This article is published in Composites Science and Technology.The article was published on 2012-06-28 and is currently open access. It has received 103 citations till now. The article focuses on the topics: Spark plasma sintering & Titanium powder.

Figures

Fig. 8 Microstructure of extruded Ti/CNTs composites after annealing at 573 and 673 K for 36 ks and 673 K for 360 ks.

Fig. 9 SEM images of (a) recrystallized grain of extruded pure Ti material and unchanged Ti grain size due to TiC pinning effect of the samples coated by (b) 1.0wt.%, (c) 2.0wt.% and (d) 3.0 wt.% CNTs/zwitterionic solution after annealing at 673 K for 360 ks.

Table 1 Chemical compositions of the pure Ti powders (wt.%)

Table 2 Average Ti grain size and TiC particle size before and after annealing at 473 K for 360 ks and after elevated temperature tensile testing at 473-673 K.

Table 3 Lattice parameters of Ti matrix, TiC dispersoid amount, dissolved carbon atom in Ti matrix and the carbon content analysis of the extruded Ti/CNTs composites after annealing at 473 K for 3.6 ks.

Fig. 5 SEM observation on fractured surface of the annealed sample of extruded pure Ti/CNTs coated by 1.0wt.% CNTs/zwitterionic solution after tensile testing at 673 K; (a) low magnification image, (b) high magnification image.