Effects of microtexture and Ti^sub 3^Al (α^sub 2^) precipitates on stress-corrosion cracking properties of a Ti-8Al-1Mo-1V alloy

Effects of microtexture and Ti3Al (α2) precipitates on the Stress-Corrosion Cracking (SCC) properties of Ti-8Al-1Mo-1V (Ti-811) have been investigated using a constant displacement SCC test in 0.1 M aqueous sodium chloride (NaCl) solution. SEM, TEM, and EBSD were employed to characterize microstruct...

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Bibliographic Details
Published in:Corrosion science 2017-02, Vol.116, p.22
Main Authors: Cao, Sheng, Lim, Chao Voon Samuel, Hinton, Bruce, Wu, Xinhua
Format: Article
Language:English
Subjects:
Aluminum
Corrosion
Corrosion effects
Crystallography
Fractography
Heat treatment
Hot isostatic pressing
Intermetallic compounds
Microstructure
Microtexture
Precipitates
Precipitation
Propagation
Sodium chloride
Stress corrosion cracking
Titanium
Titanium alloys
Titanium aluminides
Titanium base alloys
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Summary:Effects of microtexture and Ti3Al (α2) precipitates on the Stress-Corrosion Cracking (SCC) properties of Ti-8Al-1Mo-1V (Ti-811) have been investigated using a constant displacement SCC test in 0.1 M aqueous sodium chloride (NaCl) solution. SEM, TEM, and EBSD were employed to characterize microstructure and microtexture. Results reveal that both microtexture and α2 precipitates increase the SCC susceptibility of Ti-811. The SCC propagation direction aligns with microtextured regions, and most a grains were preferentially orientated for basal slip along the SCC crack. SCC susceptibility was eliminated by implementing hot isostatic pressing (HIPping) and post heat-treatment processes through eliminating both crystallographic microtexture and α2 precipitates. Fractography showed that the formation mechanism of the propagation facets could be attributed to Hydrogen Enhanced Localized Plasticity (HELP).
ISSN:0010-938X
1879-0496