EPSRC Reference: |
GR/N00296/01 |
Title: |
THE INCIDENCE AND EFFECTS OF STRESS-DIRECTED LOCALISED DEPOSITION/DEPLETION AT INTERFACES |
Principal Investigator: |
Jones, Professor H |
Other Investigators: |
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Researcher Co-Investigators: |
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Project Partners: |
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Department: |
Materials Science and Engineering |
Organisation: |
University of Sheffield |
Scheme: |
Standard Research (Pre-FEC) |
Starts: |
05 January 2000 |
Ends: |
04 October 2003 |
Value (£): |
190,073
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EPSRC Research Topic Classifications: |
Materials Characterisation |
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EPSRC Industrial Sector Classifications: |
Manufacturing |
No relevance to Underpinning Sectors |
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Related Grants: |
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Panel History: |
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Summary on Grant Application Form |
Recent work by the proposers has used surface profiling and scratch displacement observations to establish the formation of localised deposition zones (LDZs) at grain boundaries transverse to the applied tensile stress under creep conditions at low stresses. Such LDZs (showing features also evident on superplastically formed samples) are not consistent with bulk grain deformation mechanisms such as Harper-Dorn or power law creep, but are entirely in accord with operation of diffusional creep as proposed by Nabarro, Herring and Coble. Such diffusive deposition (and corresponding depletion at grain boundaries aligned with the tensile stress) can result in fracture of barrier coatings at low overall strains under low stresses although the coating may survive the more homogenous deformation associated with dislocation creep at higher stresses. The overall aims of the proposed research are (i) to indentify and account for the conditions under which stress-directed vacancy flow gives rise to such localised removal or deposition at grain boundaries and (ii) to define the role of such localised deformation in high temperature processing (e.g. superplastic forming, hot isostatic pressing, sintering) and service (e.g. durability of barrier coatings at low stresses).
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Key Findings |
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Potential use in non-academic contexts |
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Impacts |
Description |
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk |
Summary |
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Date Materialised |
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Sectors submitted by the Researcher |
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Project URL: |
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Further Information: |
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Organisation Website: |
http://www.shef.ac.uk |