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arXiv · 2010.13875

AgCl-induced hot salt stress corrosion cracking in a titanium alloy

Yitong Shi·Sudha Joseph·Edward A. Saunders·Rebecca S. Sandala·Adrian Walker·Trevor C. Lindley·David Dye
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Abstract

The mechanism of AgCl-induced stress corrosion cracking of Ti-6246 was examined at \SI{500}{\mega\pascal} and \SI{380}{\celsius} for \SI{24}{\hour} exposures. SEM and STEM-EDX examination of a FIB-sectioned blister and crack showed that metallic Ag was formed and migrated along the crack. TEM analysis also revealed the presence of \ce{SnO2} and \ce{Al2O3} corrosion products mixed into \ce{TiO2}. The fracture surface has a transgranular nature with a brittle appearance in the primary $\alpha$ phase. Long, straight and non-interacting dislocations were observed in a cleavage-fractured primary $\alpha$ grain, with basal and pyramidal traces. This is consistent with a dislocation emission view of the the cracking mechanism.

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Yitong Shi, Sudha Joseph, Edward A. Saunders, Rebecca S. Sandala, Adrian Walker, Trevor C. Lindley, David Dye. 2020-10-26. AgCl-induced hot salt stress corrosion cracking in a titanium alloy. https://arxiv.org/abs/2010.13875

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