Corrosion and Wear Behaviour of Spark Plasma-Sintered NiCrCoAlTiW-Ta Superalloy

Olugbenga Ogunbiyi, Tamba Jamiru, Rotimi Sadiku, Lodewyk Beneke, Oluwagbenga Adesina, Babatunde Abiodun Obadele

Research output: Contribution to journalArticle

Abstract

NiCrCoAlTiW-Ta superalloy was sintered using spark plasma sintering technique. The influence of starting powder particle size on the corrosion and dry sliding wear behaviour of sintered NiCrCoAlTiW-Ta superalloy was investigated. The nickel matrix (> 60 wt%) was varied over three different particle sizes (3–44, 45–106 and 106–150 µm). The powders were sintered at 1100 °C, heating rate of 100 °C/min and pressure of 32 MPa. The effect of particle sizes on sintered density, microhardness, corrosion and wear were reported. The results show that the sintered density of 97.48% and microhardness value of 382.88 HV0.1 were reported for the smallest starting powder. Furthermore, the microstructures of the sintered alloy revealed the presence of three major phases: γ, γ′ and the precipitated solid solution phase. There was an improvement in the corrosion response in relation to the particle size of the starting powder. This indicates that the least corrosive alloy has the least starting powder particle size. It has a corrosion rate of 0.047 and 0.056 mm/year in saline and acidic media, respectively. Also, the coefficient of friction increased with increase in powder particle size. However, the poor wear response of the alloys with bigger powder particle size could be attributed to poor adhesion of the oxide layer.

Original languageEnglish
Article number1
JournalJournal of Bio- and Tribo-Corrosion
Volume6
Issue number1
DOIs
Publication statusPublished - Mar 1 2020
Externally publishedYes

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Electric sparks
Superalloys
Powders
Particle size
Wear of materials
Corrosion
Plasmas
Microhardness
Caustics
Spark plasma sintering
Nickel
Corrosion rate
Heating rate
Oxides
Solid solutions
Adhesion
Friction
Microstructure

All Science Journal Classification (ASJC) codes

  • Materials Science (miscellaneous)
  • Mechanics of Materials
  • Mechanical Engineering
  • Materials Chemistry

Cite this

Ogunbiyi, Olugbenga ; Jamiru, Tamba ; Sadiku, Rotimi ; Beneke, Lodewyk ; Adesina, Oluwagbenga ; Obadele, Babatunde Abiodun. / Corrosion and Wear Behaviour of Spark Plasma-Sintered NiCrCoAlTiW-Ta Superalloy. In: Journal of Bio- and Tribo-Corrosion. 2020 ; Vol. 6, No. 1.
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Corrosion and Wear Behaviour of Spark Plasma-Sintered NiCrCoAlTiW-Ta Superalloy. / Ogunbiyi, Olugbenga; Jamiru, Tamba; Sadiku, Rotimi; Beneke, Lodewyk; Adesina, Oluwagbenga; Obadele, Babatunde Abiodun.

In: Journal of Bio- and Tribo-Corrosion, Vol. 6, No. 1, 1, 01.03.2020.

Research output: Contribution to journalArticle

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AU - Obadele, Babatunde Abiodun

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