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

Yıl 2019, Cilt: 32 Sayı: 1, 286 - 298, 01.03.2019

İsmaıl Topcu , H.Ozkan Gulsoy , Arıf N. Gulluoglu

Öz

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%.

Anahtar Kelimeler

Creep, Sintering, Ti6Al4V, Carbon Nanotube

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

Öz

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.

Anahtar Kelimeler

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

Kaynakça

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