International Hydrogen Conference (IHC 2012): Hydrogen-Materials Interactions
48 Hydrogen-Induced Cracking of Oxygen-Free Phosphorus-Doped Copper
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Hydrogen effects on the tensile properties of oxygen-free copper doped with 50 wt. ppm phosphorus were studied under continuous electrochemical hydrogen charging. It was found that hydrogen reduces the tensile strength and uniform elongation of copper in slow strain rate tests. The copper manifests a remarkable sensitivity to hydrogen in constant load tests. The creep rate of copper is about one order of magnitude higher under hydrogen charging than in testing in distilled water. The creep rupture of copper with hydrogen manifests an intergranular dimpled fracture. In order to verify the operation of the HELP mechanism and its possible role in fracture of copper, tensile specimens of single crystalline copper were tested in as-supplied state and after electrochemical hydrogen charging.