Deformation and fracture behaviour of the γ-tial based intermetallic alloys

M. N. Mathabathe; A. S. Bolokang; G. Govender; C. W. Siyasiya; R. J. Mostert

doi:10.17159/2411-9717/1344/2021

Deformation and fracture behaviour of the γ-tial based intermetallic alloys

M. N. Mathabathe, A. S. Bolokang, G. Govender, C. W. Siyasiya, R. J. Mostert

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

2 Citations (Scopus)

Abstract

The β-solidifying γ-TiAl intermetallic alloys of nominal composition Ti-48Al (binary alloy), Ti-48Al-2Nb (ternary alloy), Ti-48Al-2Nb-0.7Cr (quaternary alloy), and Ti-48Al-2Nb-0.7Cr-0.3Si (quinary alloy) (in at.%) were developed. The materials produced were tensile tested at room temperature. The as-cast microstructures and fracture surfaces of the tensile tested specimens were examined using conventional metallographic methods. Microstructural examination indicated that the alloys were comprised of lamellar structures (a2+g) embedded in columnar dendritic cores in the as-cast condition. However, the quinary alloy contained a Ti5Si3 second phase. The alloys exhibited no detectable ductility during tensile deformation, indicating the brittleness of all the materials. The fracture surfaces revealed that the alloys failed by translamellar fracture with correspondingly few cleavage facets.

Original language	English
Pages (from-to)	169-174
Number of pages	6
Journal	Journal of the Southern African Institute of Mining and Metallurgy
Volume	121
Issue number	4
DOIs	https://doi.org/10.17159/2411-9717/1344/2021
Publication status	Published - Apr 2021
Externally published	Yes

Keywords

Translamellar fracture
β-solidifying
γ-TiAl based alloys

ASJC Scopus subject areas

Geotechnical Engineering and Engineering Geology
Metals and Alloys
Materials Chemistry

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10.17159/2411-9717/1344/2021

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title = "Deformation and fracture behaviour of the γ-tial based intermetallic alloys",

abstract = "The β-solidifying γ-TiAl intermetallic alloys of nominal composition Ti-48Al (binary alloy), Ti-48Al-2Nb (ternary alloy), Ti-48Al-2Nb-0.7Cr (quaternary alloy), and Ti-48Al-2Nb-0.7Cr-0.3Si (quinary alloy) (in at.%) were developed. The materials produced were tensile tested at room temperature. The as-cast microstructures and fracture surfaces of the tensile tested specimens were examined using conventional metallographic methods. Microstructural examination indicated that the alloys were comprised of lamellar structures (a2+g) embedded in columnar dendritic cores in the as-cast condition. However, the quinary alloy contained a Ti5Si3 second phase. The alloys exhibited no detectable ductility during tensile deformation, indicating the brittleness of all the materials. The fracture surfaces revealed that the alloys failed by translamellar fracture with correspondingly few cleavage facets.",

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AU - Mathabathe, M. N.

AU - Bolokang, A. S.

AU - Govender, G.

AU - Siyasiya, C. W.

AU - Mostert, R. J.

PY - 2021/4

Y1 - 2021/4

N2 - The β-solidifying γ-TiAl intermetallic alloys of nominal composition Ti-48Al (binary alloy), Ti-48Al-2Nb (ternary alloy), Ti-48Al-2Nb-0.7Cr (quaternary alloy), and Ti-48Al-2Nb-0.7Cr-0.3Si (quinary alloy) (in at.%) were developed. The materials produced were tensile tested at room temperature. The as-cast microstructures and fracture surfaces of the tensile tested specimens were examined using conventional metallographic methods. Microstructural examination indicated that the alloys were comprised of lamellar structures (a2+g) embedded in columnar dendritic cores in the as-cast condition. However, the quinary alloy contained a Ti5Si3 second phase. The alloys exhibited no detectable ductility during tensile deformation, indicating the brittleness of all the materials. The fracture surfaces revealed that the alloys failed by translamellar fracture with correspondingly few cleavage facets.

AB - The β-solidifying γ-TiAl intermetallic alloys of nominal composition Ti-48Al (binary alloy), Ti-48Al-2Nb (ternary alloy), Ti-48Al-2Nb-0.7Cr (quaternary alloy), and Ti-48Al-2Nb-0.7Cr-0.3Si (quinary alloy) (in at.%) were developed. The materials produced were tensile tested at room temperature. The as-cast microstructures and fracture surfaces of the tensile tested specimens were examined using conventional metallographic methods. Microstructural examination indicated that the alloys were comprised of lamellar structures (a2+g) embedded in columnar dendritic cores in the as-cast condition. However, the quinary alloy contained a Ti5Si3 second phase. The alloys exhibited no detectable ductility during tensile deformation, indicating the brittleness of all the materials. The fracture surfaces revealed that the alloys failed by translamellar fracture with correspondingly few cleavage facets.

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IS - 4

ER -

Deformation and fracture behaviour of the γ-tial based intermetallic alloys

Abstract

Keywords

ASJC Scopus subject areas

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