Transformation of Al2O3 to LiAlO2 in Pb–17Li at 800 °C |
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Authors: | B.A. Pint K.L. More |
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Affiliation: | aMaterials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6156, USA |
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Abstract: | A FeCrAl substrate was pre-oxidized for 2 h at 1000 °C to thermally grow an external Al2O3 scale and then isothermally exposed to Pb–17 at.% Li for 1000 h at 800 °C to determine if this layer would protect the underlying alloy from dissolution. After exposure, a small mass gain was measured, indicating that the layer did inhibit dissolution. However, characterization of the external layer determined that it had transformed to LiAlO2 with an increased thickness and a much larger grain size than the original layer. This observation has implications for the use of Al2O3 as a permeation barrier in Pb–Li cooled fusion blanket systems. |
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