Microstructural characterisation of fatigue crack growth fracture surfaces of lamellar Ti45Al2Mn2Nb1B

J. Yang; H. Li; D. Hu; M. Dixon

doi:10.1016/j.intermet.2013.10.011

Microstructural characterisation of fatigue crack growth fracture surfaces of lamellar Ti45Al2Mn2Nb1B

J. Yang, H. Li, D. Hu, M. Dixon

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Abstract

Investment cast Ti45Al2Mn2Nb1B with fine lamellar microstructures was subject to fatigue crack propagation testing at 650 °C and a stress ratio of R = 0.1. The fracture surfaces were examined under SEM and the observed features are correlated with both stress intensity range (ΔK) and lamellar orientation. Translamellar fracture is primary fracture mode for most of the lamellar orientations. Interlamellar fracture is influenced by a combination of the ΔK and lamellar orientation. At low ΔK only the lamellar colonies with their lamellar interfaces almost perpendicular to the stress axis fractured via interlamellar fracture mode. At high ΔK interlamellar fracture can occur in lamellar colonies with any orientations.

Original language	English
Pages (from-to)	89-95
Journal	Intermetallics
Volume	45
Early online date	2 Nov 2013
DOIs	https://doi.org/10.1016/j.intermet.2013.10.011
Publication status	Published - 1 Feb 2014

Keywords

A. Titanium aluminides, based on TiAl
B. Fatigue resistance and crack growth
B. Fracture mode
D. Microstructure (as-cast)

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10.1016/j.intermet.2013.10.011

Yang_Microstructural_characterisation_fatigue_Intermetallics_2014
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title = "Microstructural characterisation of fatigue crack growth fracture surfaces of lamellar Ti45Al2Mn2Nb1B",

abstract = "Investment cast Ti45Al2Mn2Nb1B with fine lamellar microstructures was subject to fatigue crack propagation testing at 650 °C and a stress ratio of R = 0.1. The fracture surfaces were examined under SEM and the observed features are correlated with both stress intensity range (ΔK) and lamellar orientation. Translamellar fracture is primary fracture mode for most of the lamellar orientations. Interlamellar fracture is influenced by a combination of the ΔK and lamellar orientation. At low ΔK only the lamellar colonies with their lamellar interfaces almost perpendicular to the stress axis fractured via interlamellar fracture mode. At high ΔK interlamellar fracture can occur in lamellar colonies with any orientations.",

keywords = "A. Titanium aluminides, based on TiAl, B. Fatigue resistance and crack growth, B. Fracture mode, D. Microstructure (as-cast)",

author = "J. Yang and H. Li and D. Hu and M. Dixon",

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doi = "10.1016/j.intermet.2013.10.011",

language = "English",

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journal = "Intermetallics",

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T1 - Microstructural characterisation of fatigue crack growth fracture surfaces of lamellar Ti45Al2Mn2Nb1B

AU - Yang, J.

AU - Li, H.

AU - Hu, D.

AU - Dixon, M.

PY - 2014/2/1

Y1 - 2014/2/1

N2 - Investment cast Ti45Al2Mn2Nb1B with fine lamellar microstructures was subject to fatigue crack propagation testing at 650 °C and a stress ratio of R = 0.1. The fracture surfaces were examined under SEM and the observed features are correlated with both stress intensity range (ΔK) and lamellar orientation. Translamellar fracture is primary fracture mode for most of the lamellar orientations. Interlamellar fracture is influenced by a combination of the ΔK and lamellar orientation. At low ΔK only the lamellar colonies with their lamellar interfaces almost perpendicular to the stress axis fractured via interlamellar fracture mode. At high ΔK interlamellar fracture can occur in lamellar colonies with any orientations.

AB - Investment cast Ti45Al2Mn2Nb1B with fine lamellar microstructures was subject to fatigue crack propagation testing at 650 °C and a stress ratio of R = 0.1. The fracture surfaces were examined under SEM and the observed features are correlated with both stress intensity range (ΔK) and lamellar orientation. Translamellar fracture is primary fracture mode for most of the lamellar orientations. Interlamellar fracture is influenced by a combination of the ΔK and lamellar orientation. At low ΔK only the lamellar colonies with their lamellar interfaces almost perpendicular to the stress axis fractured via interlamellar fracture mode. At high ΔK interlamellar fracture can occur in lamellar colonies with any orientations.

KW - A. Titanium aluminides, based on TiAl

KW - B. Fatigue resistance and crack growth

KW - B. Fracture mode

KW - D. Microstructure (as-cast)

U2 - 10.1016/j.intermet.2013.10.011

DO - 10.1016/j.intermet.2013.10.011

M3 - Article

SN - 0966-9795

VL - 45

SP - 89

EP - 95

JO - Intermetallics

JF - Intermetallics

ER -

Microstructural characterisation of fatigue crack growth fracture surfaces of lamellar Ti45Al2Mn2Nb1B

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