The influence of oxygen on the structure, fracture, and fatigue crack propagation behavior of Ti-8.6 Wt Pct Al

George Thompson Gray; G. Luetjering; J. C. Williams

doi:10.1007/BF02656428

The influence of oxygen on the structure, fracture, and fatigue crack propagation behavior of Ti-8.6 Wt Pct Al

George Thompson Gray
, G. Luetjering
, J. C. Williams

Los Alamos National Laboratory

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

40 Scopus citations

Abstract

The effect of interstitial oxygen content on the structure, fracture, and fatigue crack propagation (FCP) behavior of Ti-8.6 wt pct Al was studied. Increasing oxygen was seen to raise the tensile flow strength of Ti-8.6A1 while coincidentally decreasing fracture ductility due to a transition in fracture mode from ductile rupture to cleavage or slipband fracture. The influence of oxygen on da/dn vs ΔK of Ti-8.6A1 in vacuum was found to vary with the R ratio. At R = 0.1, increasing oxygen led to slightly reduced FCP rates, while at R = 0.7, increasing oxygen from 500 to 1000 or 2000 ppm increased FCP rates. The K_Ic of precipitation-aged Ti-8.6A1 was seen to be reduced with increasing oxygen. The detrimental influence of oxygen on fracture ductility and K_Ic is linked to oxygen's influence on increasing slip planarity, particularly in the presence of α₂. The influence of deformation character (in particular, strain localization), rather than flow stress, in promoting cleavage-like fracture is discussed.

Original language	English
Pages (from-to)	95-105
Number of pages	11
Journal	Metallurgical Transactions A
Volume	21
Issue number	1
DOIs	https://doi.org/10.1007/BF02656428
State	Published - Jan 1 1990

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title = "The influence of oxygen on the structure, fracture, and fatigue crack propagation behavior of Ti-8.6 Wt Pct Al",

abstract = "The effect of interstitial oxygen content on the structure, fracture, and fatigue crack propagation (FCP) behavior of Ti-8.6 wt pct Al was studied. Increasing oxygen was seen to raise the tensile flow strength of Ti-8.6A1 while coincidentally decreasing fracture ductility due to a transition in fracture mode from ductile rupture to cleavage or slipband fracture. The influence of oxygen on da/dn vs ΔK of Ti-8.6A1 in vacuum was found to vary with the R ratio. At R = 0.1, increasing oxygen led to slightly reduced FCP rates, while at R = 0.7, increasing oxygen from 500 to 1000 or 2000 ppm increased FCP rates. The K Ic of precipitation-aged Ti-8.6A1 was seen to be reduced with increasing oxygen. The detrimental influence of oxygen on fracture ductility and K Ic is linked to oxygen's influence on increasing slip planarity, particularly in the presence of α2. The influence of deformation character (in particular, strain localization), rather than flow stress, in promoting cleavage-like fracture is discussed.",

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T1 - The influence of oxygen on the structure, fracture, and fatigue crack propagation behavior of Ti-8.6 Wt Pct Al

AU - Gray, George Thompson

AU - Luetjering, G.

AU - Williams, J. C.

PY - 1990/1/1

Y1 - 1990/1/1

N2 - The effect of interstitial oxygen content on the structure, fracture, and fatigue crack propagation (FCP) behavior of Ti-8.6 wt pct Al was studied. Increasing oxygen was seen to raise the tensile flow strength of Ti-8.6A1 while coincidentally decreasing fracture ductility due to a transition in fracture mode from ductile rupture to cleavage or slipband fracture. The influence of oxygen on da/dn vs ΔK of Ti-8.6A1 in vacuum was found to vary with the R ratio. At R = 0.1, increasing oxygen led to slightly reduced FCP rates, while at R = 0.7, increasing oxygen from 500 to 1000 or 2000 ppm increased FCP rates. The K Ic of precipitation-aged Ti-8.6A1 was seen to be reduced with increasing oxygen. The detrimental influence of oxygen on fracture ductility and K Ic is linked to oxygen's influence on increasing slip planarity, particularly in the presence of α2. The influence of deformation character (in particular, strain localization), rather than flow stress, in promoting cleavage-like fracture is discussed.

AB - The effect of interstitial oxygen content on the structure, fracture, and fatigue crack propagation (FCP) behavior of Ti-8.6 wt pct Al was studied. Increasing oxygen was seen to raise the tensile flow strength of Ti-8.6A1 while coincidentally decreasing fracture ductility due to a transition in fracture mode from ductile rupture to cleavage or slipband fracture. The influence of oxygen on da/dn vs ΔK of Ti-8.6A1 in vacuum was found to vary with the R ratio. At R = 0.1, increasing oxygen led to slightly reduced FCP rates, while at R = 0.7, increasing oxygen from 500 to 1000 or 2000 ppm increased FCP rates. The K Ic of precipitation-aged Ti-8.6A1 was seen to be reduced with increasing oxygen. The detrimental influence of oxygen on fracture ductility and K Ic is linked to oxygen's influence on increasing slip planarity, particularly in the presence of α2. The influence of deformation character (in particular, strain localization), rather than flow stress, in promoting cleavage-like fracture is discussed.

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The influence of oxygen on the structure, fracture, and fatigue crack propagation behavior of Ti-8.6 Wt Pct Al

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