| EPSRC Reference: |
GR/L77966/01 |
| Title: |
GRAIN BOUNDARY MIGRATION AND THE REACTIVE ELEMENT EFFECT |
| Principal Investigator: |
Harding, Professor J |
| Other Investigators: |
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| Department: |
Physics and Astronomy |
| Organisation: |
UCL |
| Scheme: |
Standard Research (Pre-FEC) |
| Starts: |
01 March 1998 |
Ends: |
28 February 2001 |
Value (£): |
51,126
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| EPSRC Research Topic Classifications: |
| Materials Characterisation |
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| EPSRC Industrial Sector Classifications: |
| No relevance to Underpinning Sectors |
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Summary on Grant Application Form |
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The reactive element effect, whereby the addition of small amounts of certain elements to an alloy can slow down the growth of oxide scale, has been known for fifty years. Despite this, the controversy about its mechanism continues. The usual explanation, that the reactive elements segregate to the grain boundaries and block cation diffusion, is not the only possibility and experimental data indicates that it is oversimplified. The proposal is to study grain boundary migration in ceramics and investigate the mechanism for the reactive element effect. Three candidate oxides (NiO, Al203 and Cr203) have been chosen. A variety of grain boundaries will be considered. The segregation energy of various species to the interfaces (gas/oxide, grain boundary and metal/oxide) will be calculated and the effect of those species on the interface structures investigated for various concentrations of the dopant. Both bulk and grain boundary diffusion activation energies (and where possible entropies) will be determined. The effect, of candidate reactive elements of the diffusion will be considered and two questions addressed; first, can a grain boundary mechanism explain the reactive element effect? second, is it possible to predict trends in behaviour and hence new reactive elements.
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Key Findings |
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Potential use in non-academic contexts |
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Impacts |
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| Description |
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk |
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| Date Materialised |
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Sectors submitted by the Researcher |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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