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

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

Materials Science 2021-03-22 v2

Authors: 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.

Keywords

stress corrosion cracking AgCl titanium alloy Ti-6246 hot salt corrosion products dislocation emission

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@article{arxiv.2010.13875,
  title  = {AgCl-induced hot salt stress corrosion cracking in a titanium alloy},
  author = {Yitong Shi and Sudha Joseph and Edward A. Saunders and Rebecca S. Sandala and Adrian Walker and Trevor C. Lindley and David Dye},
  journal= {arXiv preprint arXiv:2010.13875},
  year   = {2021}
}

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

Abstract

Keywords

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