Densification, hardness and tribological characteristics of MWCNTs reinforced Ti6Al4V compacts consolidated by spark plasma sintering

Adewale Oladapo Adegbenjo, Babatunde Abiodun Obadele, Peter Apata Olubambi

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The influence of multi-walled carbon nanotubes (MWCNTs) on the densification, hardness and tribological properties of Ti6Al4V was investigated in this study. 1, 2 and 3 wt% MWCNTs were dispersed in Ti6Al4V by high energy ball milling (HEBM) and the milled powders were consolidated by spark plasma sintering (SPS) at temperatures ranging from 850 – 1000 °C. The applied pressure, heating rate and holding time were kept constant at 50 MPa, 100 °C/min and 5 min respectively during processing. The as-received Ti6Al4V, MWCNTs, milled powders and the consolidated compacts were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). Dry sliding wear tests were conducted at three load levels of 5, 15 and 25 N on the Ti6Al4V and the Ti6Al4V/MWCNTs compacts sintered at 1000 °C using the ball-on-flat tribometer configuration with tungsten carbide (WC) as the counterface material. Wear scars and debris were also characterized by SEM and energy dispersive X-ray spectrometry (EDX) techniques. The relative density of the Ti6Al4V/MWCNTs compacts was improved with increased sintering temperature but declined with increased MWCNTs additions to Ti6Al4V. The Vickers microhardness was enhanced when both sintering temperature and MWCNTs content were increased. Wear volume loss and coefficient of friction for the MWCNTs containing compacts were improved over that of the unreinforced Ti6Al4V alloy. The observed wear resistance enhancement had a positive correlation with the extent of MWCNTs dispersion within Ti6Al4V, the interfacial bond strength between Ti6Al4V and MWCNTs, as well as the presence of hard TiC interfacial product. Although the 2 wt% MWCNTs composite had the least observed material loss during wear testing, the Ti6Al4V/1 wt% MWCNTs composite however exhibited the optimal wear resistance and coefficient of friction (COF) performance comparatively among all the investigated composites.

Original languageEnglish
Pages (from-to)818-833
Number of pages16
JournalJournal of Alloys and Compounds
Volume749
DOIs
Publication statusPublished - Jun 15 2018
Externally publishedYes

Fingerprint

Carbon Nanotubes
Spark plasma sintering
Densification
Carbon nanotubes
Hardness
Wear of materials
Powders
Wear resistance
titanium alloy (TiAl6V4)
Composite materials
Sintering
Friction
Scanning electron microscopy
Tungsten carbide
Ball milling
Heating rate
Debris
Microhardness
Temperature

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

@article{c0b8971762114ceaae6e294634291cbf,
title = "Densification, hardness and tribological characteristics of MWCNTs reinforced Ti6Al4V compacts consolidated by spark plasma sintering",
abstract = "The influence of multi-walled carbon nanotubes (MWCNTs) on the densification, hardness and tribological properties of Ti6Al4V was investigated in this study. 1, 2 and 3 wt{\%} MWCNTs were dispersed in Ti6Al4V by high energy ball milling (HEBM) and the milled powders were consolidated by spark plasma sintering (SPS) at temperatures ranging from 850 – 1000 °C. The applied pressure, heating rate and holding time were kept constant at 50 MPa, 100 °C/min and 5 min respectively during processing. The as-received Ti6Al4V, MWCNTs, milled powders and the consolidated compacts were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). Dry sliding wear tests were conducted at three load levels of 5, 15 and 25 N on the Ti6Al4V and the Ti6Al4V/MWCNTs compacts sintered at 1000 °C using the ball-on-flat tribometer configuration with tungsten carbide (WC) as the counterface material. Wear scars and debris were also characterized by SEM and energy dispersive X-ray spectrometry (EDX) techniques. The relative density of the Ti6Al4V/MWCNTs compacts was improved with increased sintering temperature but declined with increased MWCNTs additions to Ti6Al4V. The Vickers microhardness was enhanced when both sintering temperature and MWCNTs content were increased. Wear volume loss and coefficient of friction for the MWCNTs containing compacts were improved over that of the unreinforced Ti6Al4V alloy. The observed wear resistance enhancement had a positive correlation with the extent of MWCNTs dispersion within Ti6Al4V, the interfacial bond strength between Ti6Al4V and MWCNTs, as well as the presence of hard TiC interfacial product. Although the 2 wt{\%} MWCNTs composite had the least observed material loss during wear testing, the Ti6Al4V/1 wt{\%} MWCNTs composite however exhibited the optimal wear resistance and coefficient of friction (COF) performance comparatively among all the investigated composites.",
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Densification, hardness and tribological characteristics of MWCNTs reinforced Ti6Al4V compacts consolidated by spark plasma sintering. / Adegbenjo, Adewale Oladapo; Obadele, Babatunde Abiodun; Olubambi, Peter Apata.

In: Journal of Alloys and Compounds, Vol. 749, 15.06.2018, p. 818-833.

Research output: Contribution to journalArticle

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T1 - Densification, hardness and tribological characteristics of MWCNTs reinforced Ti6Al4V compacts consolidated by spark plasma sintering

AU - Adegbenjo, Adewale Oladapo

AU - Obadele, Babatunde Abiodun

AU - Olubambi, Peter Apata

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N2 - The influence of multi-walled carbon nanotubes (MWCNTs) on the densification, hardness and tribological properties of Ti6Al4V was investigated in this study. 1, 2 and 3 wt% MWCNTs were dispersed in Ti6Al4V by high energy ball milling (HEBM) and the milled powders were consolidated by spark plasma sintering (SPS) at temperatures ranging from 850 – 1000 °C. The applied pressure, heating rate and holding time were kept constant at 50 MPa, 100 °C/min and 5 min respectively during processing. The as-received Ti6Al4V, MWCNTs, milled powders and the consolidated compacts were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). Dry sliding wear tests were conducted at three load levels of 5, 15 and 25 N on the Ti6Al4V and the Ti6Al4V/MWCNTs compacts sintered at 1000 °C using the ball-on-flat tribometer configuration with tungsten carbide (WC) as the counterface material. Wear scars and debris were also characterized by SEM and energy dispersive X-ray spectrometry (EDX) techniques. The relative density of the Ti6Al4V/MWCNTs compacts was improved with increased sintering temperature but declined with increased MWCNTs additions to Ti6Al4V. The Vickers microhardness was enhanced when both sintering temperature and MWCNTs content were increased. Wear volume loss and coefficient of friction for the MWCNTs containing compacts were improved over that of the unreinforced Ti6Al4V alloy. The observed wear resistance enhancement had a positive correlation with the extent of MWCNTs dispersion within Ti6Al4V, the interfacial bond strength between Ti6Al4V and MWCNTs, as well as the presence of hard TiC interfacial product. Although the 2 wt% MWCNTs composite had the least observed material loss during wear testing, the Ti6Al4V/1 wt% MWCNTs composite however exhibited the optimal wear resistance and coefficient of friction (COF) performance comparatively among all the investigated composites.

AB - The influence of multi-walled carbon nanotubes (MWCNTs) on the densification, hardness and tribological properties of Ti6Al4V was investigated in this study. 1, 2 and 3 wt% MWCNTs were dispersed in Ti6Al4V by high energy ball milling (HEBM) and the milled powders were consolidated by spark plasma sintering (SPS) at temperatures ranging from 850 – 1000 °C. The applied pressure, heating rate and holding time were kept constant at 50 MPa, 100 °C/min and 5 min respectively during processing. The as-received Ti6Al4V, MWCNTs, milled powders and the consolidated compacts were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). Dry sliding wear tests were conducted at three load levels of 5, 15 and 25 N on the Ti6Al4V and the Ti6Al4V/MWCNTs compacts sintered at 1000 °C using the ball-on-flat tribometer configuration with tungsten carbide (WC) as the counterface material. Wear scars and debris were also characterized by SEM and energy dispersive X-ray spectrometry (EDX) techniques. The relative density of the Ti6Al4V/MWCNTs compacts was improved with increased sintering temperature but declined with increased MWCNTs additions to Ti6Al4V. The Vickers microhardness was enhanced when both sintering temperature and MWCNTs content were increased. Wear volume loss and coefficient of friction for the MWCNTs containing compacts were improved over that of the unreinforced Ti6Al4V alloy. The observed wear resistance enhancement had a positive correlation with the extent of MWCNTs dispersion within Ti6Al4V, the interfacial bond strength between Ti6Al4V and MWCNTs, as well as the presence of hard TiC interfacial product. Although the 2 wt% MWCNTs composite had the least observed material loss during wear testing, the Ti6Al4V/1 wt% MWCNTs composite however exhibited the optimal wear resistance and coefficient of friction (COF) performance comparatively among all the investigated composites.

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