Field-Assisted Sintering on Microstructural Evolution and Properties of TiAl Intermetallic Alloys

E. Nsiah-Baafi; A. Andrews; M. M. Ramakokovhu; P. A. Olubambi

doi:10.1007/s12666-023-02948-8

Field-Assisted Sintering on Microstructural Evolution and Properties of TiAl Intermetallic Alloys

E. Nsiah-Baafi, A. Andrews, M. M. Ramakokovhu, P. A. Olubambi

Metallurgy

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

Abstract

The addition of minor fractions of grain refiners commonly improves the mechanical properties of TiAl intermetallic alloys. In this study, Ti-36 wt.% Al powders were consolidated using a field-assisted sintering technique without adding grain refiners. Various temperatures (650–1300 °C) and pressures (14–50 MPa) were used to elucidate the structure–property relationship. An intermetallic of 99.9% relative density with a corresponding microhardness value of 327 ± 6 HV_0.5 was achieved for alloys sintered at 1300 °C and 16 MPa. Alloys sintered at 1100 °C displayed a microstructure consisting of citrus Ti-rich grains, while a duplex microstructure consisting of γ-TiAl + α₂-Ti₃Al lamellae, and γ-TiAl phases were observed at 1300 °C.

Original language	English
Pages (from-to)	2625-2633
Number of pages	9
Journal	Transactions of the Indian Institute of Metals
Volume	76
Issue number	10
DOIs	https://doi.org/10.1007/s12666-023-02948-8
Publication status	Published - Oct 2023

Keywords

Field-assisted sintering
Grain refiner
Mechanical properties
Titanium aluminides

ASJC Scopus subject areas

Metals and Alloys

Access to Document

10.1007/s12666-023-02948-8

Cite this

@article{23b75ba0f9724b6b8d633a502c952848,

title = "Field-Assisted Sintering on Microstructural Evolution and Properties of TiAl Intermetallic Alloys",

abstract = "The addition of minor fractions of grain refiners commonly improves the mechanical properties of TiAl intermetallic alloys. In this study, Ti-36 wt.% Al powders were consolidated using a field-assisted sintering technique without adding grain refiners. Various temperatures (650–1300 °C) and pressures (14–50 MPa) were used to elucidate the structure–property relationship. An intermetallic of 99.9% relative density with a corresponding microhardness value of 327 ± 6 HV0.5 was achieved for alloys sintered at 1300 °C and 16 MPa. Alloys sintered at 1100 °C displayed a microstructure consisting of citrus Ti-rich grains, while a duplex microstructure consisting of γ-TiAl + α2-Ti3Al lamellae, and γ-TiAl phases were observed at 1300 °C.",

keywords = "Field-assisted sintering, Grain refiner, Mechanical properties, Titanium aluminides",

author = "E. Nsiah-Baafi and A. Andrews and Ramakokovhu, {M. M.} and Olubambi, {P. A.}",

note = "Publisher Copyright: {\textcopyright} 2023, The Indian Institute of Metals - IIM.",

year = "2023",

month = oct,

doi = "10.1007/s12666-023-02948-8",

language = "English",

volume = "76",

pages = "2625--2633",

journal = "Transactions of the Indian Institute of Metals",

issn = "0972-2815",

publisher = "Springer",

number = "10",

}

TY - JOUR

T1 - Field-Assisted Sintering on Microstructural Evolution and Properties of TiAl Intermetallic Alloys

AU - Nsiah-Baafi, E.

AU - Andrews, A.

AU - Ramakokovhu, M. M.

AU - Olubambi, P. A.

PY - 2023/10

Y1 - 2023/10

N2 - The addition of minor fractions of grain refiners commonly improves the mechanical properties of TiAl intermetallic alloys. In this study, Ti-36 wt.% Al powders were consolidated using a field-assisted sintering technique without adding grain refiners. Various temperatures (650–1300 °C) and pressures (14–50 MPa) were used to elucidate the structure–property relationship. An intermetallic of 99.9% relative density with a corresponding microhardness value of 327 ± 6 HV0.5 was achieved for alloys sintered at 1300 °C and 16 MPa. Alloys sintered at 1100 °C displayed a microstructure consisting of citrus Ti-rich grains, while a duplex microstructure consisting of γ-TiAl + α2-Ti3Al lamellae, and γ-TiAl phases were observed at 1300 °C.

AB - The addition of minor fractions of grain refiners commonly improves the mechanical properties of TiAl intermetallic alloys. In this study, Ti-36 wt.% Al powders were consolidated using a field-assisted sintering technique without adding grain refiners. Various temperatures (650–1300 °C) and pressures (14–50 MPa) were used to elucidate the structure–property relationship. An intermetallic of 99.9% relative density with a corresponding microhardness value of 327 ± 6 HV0.5 was achieved for alloys sintered at 1300 °C and 16 MPa. Alloys sintered at 1100 °C displayed a microstructure consisting of citrus Ti-rich grains, while a duplex microstructure consisting of γ-TiAl + α2-Ti3Al lamellae, and γ-TiAl phases were observed at 1300 °C.

KW - Field-assisted sintering

KW - Grain refiner

KW - Mechanical properties

KW - Titanium aluminides

UR - http://www.scopus.com/inward/record.url?scp=85153374290&partnerID=8YFLogxK

U2 - 10.1007/s12666-023-02948-8

DO - 10.1007/s12666-023-02948-8

M3 - Article

AN - SCOPUS:85153374290

SN - 0972-2815

VL - 76

SP - 2625

EP - 2633

JO - Transactions of the Indian Institute of Metals

JF - Transactions of the Indian Institute of Metals

IS - 10

ER -

Field-Assisted Sintering on Microstructural Evolution and Properties of TiAl Intermetallic Alloys

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this