Compressive deformation behaviour and toughening mechanisms of spark plasma sintered NiAl-CNT composites

Mary A. Awotunde; Peter A. Olubambi; Daolun Chen

doi:10.1016/j.ceramint.2022.02.153

Compressive deformation behaviour and toughening mechanisms of spark plasma sintered NiAl-CNT composites

Mary A. Awotunde, Peter A. Olubambi, Daolun Chen

Metallurgy

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

Carbon nanotube (CNT)-reinforced NiAl intermetallic composites were produced via powder metallurgy, particularly spark plasma sintering. The aim of this study was to evaluate the room temperature compressive behaviour of the sintered NiAl-CNT composites with a focus on the toughening mechanisms of the CNT reinforcement and the resulting microstructures. Remarkably, the NiAl-0.5 wt% CNT composites exhibited a balanced combination of strength and toughness despite a trade-off tendency, due to the presence of both coarse and fine bimodal grains in its microstructure. Mechanical properties of 831 MPa, 429 MPa and 360 HV were recorded for the ultimate compressive strength (UCS), compressive yield strength (CYS) and microhardness of the NiAl-0.5%CNT intermetallic composites, respectively, along with a compressive strain of 12% being higher than the unreinforced NiAl.

Original language	English
Pages (from-to)	16072-16084
Number of pages	13
Journal	Ceramics International
Volume	48
Issue number	11
DOIs	https://doi.org/10.1016/j.ceramint.2022.02.153
Publication status	Published - 1 Jun 2022

Keywords

Bimodal microstructure
Carbon nanotubes
Compressive deformation
Nickel aluminide
Spark plasma sintering
Toughening mechanism

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Process Chemistry and Technology
Surfaces, Coatings and Films
Materials Chemistry

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10.1016/j.ceramint.2022.02.153

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title = "Compressive deformation behaviour and toughening mechanisms of spark plasma sintered NiAl-CNT composites",

abstract = "Carbon nanotube (CNT)-reinforced NiAl intermetallic composites were produced via powder metallurgy, particularly spark plasma sintering. The aim of this study was to evaluate the room temperature compressive behaviour of the sintered NiAl-CNT composites with a focus on the toughening mechanisms of the CNT reinforcement and the resulting microstructures. Remarkably, the NiAl-0.5 wt% CNT composites exhibited a balanced combination of strength and toughness despite a trade-off tendency, due to the presence of both coarse and fine bimodal grains in its microstructure. Mechanical properties of 831 MPa, 429 MPa and 360 HV were recorded for the ultimate compressive strength (UCS), compressive yield strength (CYS) and microhardness of the NiAl-0.5%CNT intermetallic composites, respectively, along with a compressive strain of 12% being higher than the unreinforced NiAl.",

keywords = "Bimodal microstructure, Carbon nanotubes, Compressive deformation, Nickel aluminide, Spark plasma sintering, Toughening mechanism",

author = "Awotunde, {Mary A.} and Olubambi, {Peter A.} and Daolun Chen",

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T1 - Compressive deformation behaviour and toughening mechanisms of spark plasma sintered NiAl-CNT composites

AU - Awotunde, Mary A.

AU - Olubambi, Peter A.

AU - Chen, Daolun

PY - 2022/6/1

Y1 - 2022/6/1

N2 - Carbon nanotube (CNT)-reinforced NiAl intermetallic composites were produced via powder metallurgy, particularly spark plasma sintering. The aim of this study was to evaluate the room temperature compressive behaviour of the sintered NiAl-CNT composites with a focus on the toughening mechanisms of the CNT reinforcement and the resulting microstructures. Remarkably, the NiAl-0.5 wt% CNT composites exhibited a balanced combination of strength and toughness despite a trade-off tendency, due to the presence of both coarse and fine bimodal grains in its microstructure. Mechanical properties of 831 MPa, 429 MPa and 360 HV were recorded for the ultimate compressive strength (UCS), compressive yield strength (CYS) and microhardness of the NiAl-0.5%CNT intermetallic composites, respectively, along with a compressive strain of 12% being higher than the unreinforced NiAl.

AB - Carbon nanotube (CNT)-reinforced NiAl intermetallic composites were produced via powder metallurgy, particularly spark plasma sintering. The aim of this study was to evaluate the room temperature compressive behaviour of the sintered NiAl-CNT composites with a focus on the toughening mechanisms of the CNT reinforcement and the resulting microstructures. Remarkably, the NiAl-0.5 wt% CNT composites exhibited a balanced combination of strength and toughness despite a trade-off tendency, due to the presence of both coarse and fine bimodal grains in its microstructure. Mechanical properties of 831 MPa, 429 MPa and 360 HV were recorded for the ultimate compressive strength (UCS), compressive yield strength (CYS) and microhardness of the NiAl-0.5%CNT intermetallic composites, respectively, along with a compressive strain of 12% being higher than the unreinforced NiAl.

KW - Bimodal microstructure

KW - Carbon nanotubes

KW - Compressive deformation

KW - Nickel aluminide

KW - Spark plasma sintering

KW - Toughening mechanism

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SN - 0272-8842

VL - 48

SP - 16072

EP - 16084

JO - Ceramics International

JF - Ceramics International

IS - 11

ER -

Compressive deformation behaviour and toughening mechanisms of spark plasma sintered NiAl-CNT composites

Abstract

Keywords

ASJC Scopus subject areas

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