Microstructure and mechanical properties of multi-phase TiAl alloy matrix composites consolidated via field-assisted sintering technique

Azeez Lawan Rominiyi; Peter Madindwa Mashinini; Bathusile Nelisiwe Masina; Mxolisi Brendon Shongwe

doi:10.1007/s42247-024-00831-w

Microstructure and mechanical properties of multi-phase TiAl alloy matrix composites consolidated via field-assisted sintering technique

Azeez Lawan Rominiyi, Peter Madindwa Mashinini, Bathusile Nelisiwe Masina, Mxolisi Brendon Shongwe

Mechanical and Industrial Engineering Technology

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

Abstract

In this study, fully densified Si₃N₄/TiAl composites were fabricated using the field-assisted sintering technique (FAST). Microstructural analysis showed the evolution of a continuous network structure consisting of minor fractions of in-situ formed Ti₂AlN, unreacted Si₃N₄ ceramic particles and dominant Ti₅Si₃ intermetallic phases within the TiAl matrix at Si₃N₄ content above 1.5 wt%. The hardness of the developed composites increases with increasing Si₃N₄ content, with 7Si₃N₄/TiAl composite exhibiting the highest hardness of approximately 487 HV_1.0, which was about 57% higher than that of the sintered pure TiAl alloy. Among the sintered samples, 1.5Si₃N₄/TiAl composite displayed the highest flexural strength of 832.65 ± 12.88 MPa (34.3% higher than pure TiAl matrix) with a deflection of 0.14 mm. In contrast, the lowest flexural strength and deflection of 535.44 ± 21.14 MPa and 0.09 mm were obtained in composite reinforced with 7 wt% Si₃N₄ ceramic content. The fractured surface of the sintered samples displayed predominantly cleavage fracture mode.

Original language	English
Journal	Emergent Materials
DOIs	https://doi.org/10.1007/s42247-024-00831-w
Publication status	Accepted/In press - 2024

Keywords

Field-assisted sintering technique
In-situ phases
Mechanical properties
Microstructure
SiN/TiAl composite
TiAl alloy

ASJC Scopus subject areas

Ceramics and Composites
Biomaterials
Renewable Energy, Sustainability and the Environment
Waste Management and Disposal

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10.1007/s42247-024-00831-w

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@article{c93bd74c8692473692f221a99d828565,

title = "Microstructure and mechanical properties of multi-phase TiAl alloy matrix composites consolidated via field-assisted sintering technique",

abstract = "In this study, fully densified Si3N4/TiAl composites were fabricated using the field-assisted sintering technique (FAST). Microstructural analysis showed the evolution of a continuous network structure consisting of minor fractions of in-situ formed Ti2AlN, unreacted Si3N4 ceramic particles and dominant Ti5Si3 intermetallic phases within the TiAl matrix at Si3N4 content above 1.5 wt%. The hardness of the developed composites increases with increasing Si3N4 content, with 7Si3N4/TiAl composite exhibiting the highest hardness of approximately 487 HV1.0, which was about 57% higher than that of the sintered pure TiAl alloy. Among the sintered samples, 1.5Si3N4/TiAl composite displayed the highest flexural strength of 832.65 ± 12.88 MPa (34.3% higher than pure TiAl matrix) with a deflection of 0.14 mm. In contrast, the lowest flexural strength and deflection of 535.44 ± 21.14 MPa and 0.09 mm were obtained in composite reinforced with 7 wt% Si3N4 ceramic content. The fractured surface of the sintered samples displayed predominantly cleavage fracture mode.",

keywords = "Field-assisted sintering technique, In-situ phases, Mechanical properties, Microstructure, SiN/TiAl composite, TiAl alloy",

author = "Rominiyi, {Azeez Lawan} and Mashinini, {Peter Madindwa} and Masina, {Bathusile Nelisiwe} and Shongwe, {Mxolisi Brendon}",

note = "Publisher Copyright: {\textcopyright} The Author(s) 2024.",

year = "2024",

doi = "10.1007/s42247-024-00831-w",

language = "English",

journal = "Emergent Materials",

issn = "2522-5731",

publisher = "Springer Nature",

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T1 - Microstructure and mechanical properties of multi-phase TiAl alloy matrix composites consolidated via field-assisted sintering technique

AU - Rominiyi, Azeez Lawan

AU - Mashinini, Peter Madindwa

AU - Masina, Bathusile Nelisiwe

AU - Shongwe, Mxolisi Brendon

N1 - Publisher Copyright: © The Author(s) 2024.

PY - 2024

Y1 - 2024

N2 - In this study, fully densified Si3N4/TiAl composites were fabricated using the field-assisted sintering technique (FAST). Microstructural analysis showed the evolution of a continuous network structure consisting of minor fractions of in-situ formed Ti2AlN, unreacted Si3N4 ceramic particles and dominant Ti5Si3 intermetallic phases within the TiAl matrix at Si3N4 content above 1.5 wt%. The hardness of the developed composites increases with increasing Si3N4 content, with 7Si3N4/TiAl composite exhibiting the highest hardness of approximately 487 HV1.0, which was about 57% higher than that of the sintered pure TiAl alloy. Among the sintered samples, 1.5Si3N4/TiAl composite displayed the highest flexural strength of 832.65 ± 12.88 MPa (34.3% higher than pure TiAl matrix) with a deflection of 0.14 mm. In contrast, the lowest flexural strength and deflection of 535.44 ± 21.14 MPa and 0.09 mm were obtained in composite reinforced with 7 wt% Si3N4 ceramic content. The fractured surface of the sintered samples displayed predominantly cleavage fracture mode.

AB - In this study, fully densified Si3N4/TiAl composites were fabricated using the field-assisted sintering technique (FAST). Microstructural analysis showed the evolution of a continuous network structure consisting of minor fractions of in-situ formed Ti2AlN, unreacted Si3N4 ceramic particles and dominant Ti5Si3 intermetallic phases within the TiAl matrix at Si3N4 content above 1.5 wt%. The hardness of the developed composites increases with increasing Si3N4 content, with 7Si3N4/TiAl composite exhibiting the highest hardness of approximately 487 HV1.0, which was about 57% higher than that of the sintered pure TiAl alloy. Among the sintered samples, 1.5Si3N4/TiAl composite displayed the highest flexural strength of 832.65 ± 12.88 MPa (34.3% higher than pure TiAl matrix) with a deflection of 0.14 mm. In contrast, the lowest flexural strength and deflection of 535.44 ± 21.14 MPa and 0.09 mm were obtained in composite reinforced with 7 wt% Si3N4 ceramic content. The fractured surface of the sintered samples displayed predominantly cleavage fracture mode.

KW - Field-assisted sintering technique

KW - In-situ phases

KW - Mechanical properties

KW - Microstructure

KW - SiN/TiAl composite

KW - TiAl alloy

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U2 - 10.1007/s42247-024-00831-w

DO - 10.1007/s42247-024-00831-w

M3 - Article

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SN - 2522-5731

JO - Emergent Materials

JF - Emergent Materials

ER -

Microstructure and mechanical properties of multi-phase TiAl alloy matrix composites consolidated via field-assisted sintering technique

Abstract

Keywords

ASJC Scopus subject areas

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