Influence of Carbon Reinforcements on the Mechanical Properties of Ti Composites via Powder Metallurgy and Hot Extrusion

Abstract:

Ti metal matrix composites (Ti–MMCs) reinforced by vapor grown carbon nanofiber (VGCF) and graphite particle (Gr) were prepared via powder metallurgy and hot extrusion. Ti with 0~0.4wt% VGCF/Gr mixture powders were consolidated by using spark plasma sintering (SPS) at 800 °C. Hot extrusion was then performed at 1000 °C with an extrusion ratio of 37:1. Microstructures and mechanical properties of the as-extruded Ti composites were investigated. Tensile strength of Ti–VGCF/Gr composites was steadily augmented when additions of VGCF/Gr were increased from 0.1 to 0.4 wt%. YS and UTS were increased 40.2% and 11.4% for Ti–0.4wt%VGCF as compared to pure Ti, while those values were 30.5% and 2.1% for Ti–0.4wt%Gr. The strengthening mechanism including grain refinement, carbon solid solution strengthening and dispersion hardening of TiC/carbon was discussed in detail.

• Periodical: Materials Science Forum (Volume 750)
• Pages: 40-43
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.750.40
• Online since: March 2013
• Authors: Shu Feng Li, Bin Sun, Katsuyoshi Kondoh, Takanori Mimoto, Hisashi Imai
• Keywords: Carbon Nanofiber, Graphite, Hot Extrusion, Powder Metallurgy (PM), Ti Metal Matrix Composite, Titanium

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