Evaluation of Multi-Walled CNT particulate reinforced Ti6Al4V alloy based composites creep behavior of materials under static loads.

Abstract

This study examines the effects of additions of Carbon Nanotube (CNT) into Ti6Al4V matrix by mechanical alloying at low CNT rates and investigates into sintering conditions on the density, microstructure, and static creep behaviors. After producing Ti6Al4V composites containing different amounts of CNT by mechanical alloying and sintering at 1300°C.

The density of CNT reinforced Ti6Al4V composites sintered at 1300°C for 3h decreases with increasing CNT content. The hardness tests indicated that the hardness of composites increased with CNT addition. Creep tests showed that the creep strength of composites increased with CNT content until 4% of CNT but decreased after this value. In addition, although static creep displacements are decreased continually with CNT content until 5%, static creep life increased with increasing CNT content until 4% of CNT but decreased above 4%.

Keywords

• Creep,Sintering,Ti6Al4V,Carbon Nanotube

Evaluation of Multi-Walled CNT Particulate Reinforced Ti6Al4V Alloy Based Composites Creep Behavior of Materials Under Static Loads

Abstract

This study examines the effects of additions of 0.5-5 v/v percentage multi-walled carbon nanotubes into the Ti-6Al-4V matrix by mechanical alloying at low rates and investigates the results of the different sintering conditions on the density, microstructure, and Creep behavior. Mechanical properties, microstructural and density of composite materials (Ti64 / CNT) produced by cold isostatic press molding method have been investigated. MWCNTs reinforced metal matrix composite powders were molded by cold isostatic pressing method using polyacrylonitrile (PAN) based binder. The binder decomposition was carried out by heat treatment. After molding, the specimens have been sintered at high temperature in high vacuum (10-2 bar). Metallographic experiments were carried out to examine density and microstructure. Experimental results indicate Ti–6Al–4V particulate can be sintered to up to 98,5% of calculated density. Maximum hardness was obtained 538 HV at 1300 oC for 3 hours and creep life inverse. By using SEM and X-ray diffractometer the characteristics of produced composite samples were investigated. Although Ti–6Al–4V alloys are used as biomaterial, this study aimed at using MWCNTs containing Ti-6Al-4V composites at high temperature applications. Because MWCNTs reinforced Ti-6Al-4V composites are cheaper and has lower weight than the other materials used in this kind of applications.

Keywords

• Creep,Sintering,Ti-6Al-4V,Multi-Walled Carbon,Nanotube

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