Microstructural evolution and mechanical properties of pure titanium powders processed by spark plasma sintering

In this study the effect of sintering pressure on the densification, microstructure and mechanical properties of commercial pure titanium (CP-Ti) powders with varying chemistry was investigated. The sintering was performed at a constant dwell time of 3 min at varying temperature and pressure in the...

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Bibliographic Details
Published in:Powder technology 2019-03, Vol.345, p.415-424
Main Authors: Motsi, Glenda T., Guillemet-Fritsch, Sophie, Chevallier, Geoffroy, Shongwe, Mxolisi B., Olubambi, Peter A., Estournes, Claude
Format: Article
Language:English
Subjects:
CP-Ti
Densification
Diamond pyramid hardness
Dwell time
Engineering Sciences
Fabrication
Hardness
Interstitial elements
Low temperature
Materials
Mechanical properties
Microstructure
Organic chemistry
Plasma sintering
Pressure
Pressure effects
Spark plasma sintering
Temperature effects
Titanium
Vacuum
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Summary:In this study the effect of sintering pressure on the densification, microstructure and mechanical properties of commercial pure titanium (CP-Ti) powders with varying chemistry was investigated. The sintering was performed at a constant dwell time of 3 min at varying temperature and pressure in the range of 550–900 °C and 25-75 MPa in vacuum, respectively. Full densification with high Vickers hardness values of 340 HV and 262 HV was obtained at 25 MPa at 800 °C and 900 °C respectively for two commercial powders with different average particles sizes. Different microstructural transformations with respect to increasing temperature and pressure were observed on the sintered pellets. The results were discussed emphasizing the huge role of the interstitial elements, contained in the starting powders, on the properties (relative density, Vickers hardness and microstructure) of the dense samples. This paper shows that good mechanical properties can be obtained by SPS technique when CP-Ti powders are sintered at very low temperature during a short period in contrast to conventional fabrication techniques. [Display omitted] •Secondary alpha phase volume fraction increase with pressure•Varying applied sintering pressures resulted in different microstructures•Electrical discharges and plastic deformation are possible mechanisms with varying pressure during densification
ISSN:0032-5910
1873-328X
DOI:10.1016/j.powtec.2019.01.005