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Titanium + Hydrogen Degradation T.B. Britton
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X-H Comparisons Ti-H phase diagram A. San-Martin and F.D. Manchester Bulletin of Alloy Phase Diagrams (1987) Zr-H phase diagram E. Zuzek, J.P. Abriata, A. San-Martin and F.D. Manchester Bulletin of Alloy Phase Diagrams (1990)
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X-H Comparisons The solubility curve of [H] in Zr is very steep Cooling to RT precipitates out hydrides Brittle and reduces fracture toughness The solubility curve of [H] in Ti is less steep [H] also goes into the beta phase (BCC) 1 Fast diffusion and lots of sites Leads to volumetric expansion (up to 5.4%) Likely to be fewer hydrides… Temperature (°C) 1.Tal-Gutelmacher and Eliezer – Hydrogen-Assisted Degradation of Titanium Based Alloys Materials Transactions (2004)
![X-H Comparisons The solubility curve of [H] in Zr is very steep Cooling to RT precipitates out hydrides Brittle and reduces fracture toughness The solubility curve of [H] in Ti is less steep [H] also goes into the beta phase (BCC) 1 Fast diffusion and lots of sites Leads to volumetric expansion (up to 5.4%) Likely to be fewer hydrides… Temperature (°C) 1.Tal-Gutelmacher and Eliezer – Hydrogen-Assisted Degradation of Titanium Based Alloys Materials Transactions (2004)](http://images.slideplayer.com./35/10439989/slides/slide_3.jpg "X-H Comparisons The solubility curve of [H] in Zr is very steep Cooling to RT precipitates out hydrides Brittle and reduces fracture toughness The solubility curve of [H] in Ti is less steep [H] also goes into the beta phase (BCC) 1 Fast diffusion and lots of sites Leads to volumetric expansion (up to 5.4%) Likely to be fewer hydrides… Temperature (°C) 1.Tal-Gutelmacher and Eliezer – Hydrogen-Assisted Degradation of Titanium Based Alloys Materials Transactions (2004)")
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