| EPSRC Reference: |
GR/M09728/01 |
| Title: |
HYDROGEN-ASSISTED REACTIVE SYNTHESIS OF TI-BASED INTERMETALLICS |
| Principal Investigator: |
Guo, Professor ZX |
| Other Investigators: |
|
| Researcher Co-Investigators: |
|
| Project Partners: |
|
| Department: |
Materials |
| Organisation: |
Queen Mary University of London |
| Scheme: |
Standard Research (Pre-FEC) |
| Starts: |
01 January 1999 |
Ends: |
30 June 2001 |
Value (£): |
118,803
|
| EPSRC Research Topic Classifications: |
|
| EPSRC Industrial Sector Classifications: |
|
| Related Grants: |
|
| Panel History: |
|
|
Summary on Grant Application Form |
|
It is proposed to use hydrogen as a beneficial temporary alloying element to tailor reactive powder processing into a cost-effective and useful manufacturing route for Ti-based materials. Hydrogen in titanium enhances particle refinement during powder milling and improves sinterability and microstructural attributes during reactive synthesis. It can be readily charged into and removed from titanium at temperature with complete reversibility and hydrogen embrittlement can be totally avoided after de-hydrogenation in vacuum. Ti hydride and (Ti, Al, Nb) elemental powders will be mixed in a ball mill, with the aim to synthesis fine-grained and porosity-free Ti2AlNb based intermetallics. Effects of milling conditions on power size/distribution and green density of powder compact will be characterised using x-ray and particle-size analyses. The relationships of hydrogen solubility with alloy chemistry and milling conditions will be studied using thermodynamic principles, in order to determine the optimum hydrogen content for a given alloy composition. Modelling of the de-hydrogenation process will be carried out using a Fickian diffusion controlled desorption approach, which will allow the prediction of the time required for complete hydrogen removal. Microscopic analyses will be performed to identify the effects of hydrogen on grain sizes, porosity and phase distribution.It is proposed to use hydrogen as a beneficial temporary alloying element to tailor reactive powder processing into a cost-effective and useful manufacturing route for Ti-based materials. Hydrogen in titanium enhances particle refinement during powder milling and improves sinterability and microstructural attributes during reactive synthesis. It can be readily charged into and removed from titanium at temperature with complete reversibility and hydrogen embrittlement can be totally avoided after de-hydrogenation in vacuum. Ti hydride and (Ti, Al, Nb) elemental powders will be mixed in a ball mill, with the aim to synthesis fine-grained and porosity-free Ti2AlNb based intermetallics. Effects of milling conditions on power size/distribution and green density of powder compact will be characterised using x-ray and particle-size analyses. The relationships of hydrogen solubility with alloy chemistry and milling conditions will be studied using thermodynamic principles, in order to determine the optimum hydrogen content for a given alloy composition. Modelling of the de-hydrogenation process will be carried out using a Fickian diffusion controlled desorption approach, which will allow the prediction of the time required for complete hydrogen removal. Microscopic analyses will be performed to identify the effects of hydrogen on grain sizes, porosity and phase distribution.
|
|
Key Findings |
|
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
|
|
Potential use in non-academic contexts |
|
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
|
|
Impacts |
|
| Description |
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk |
| Summary |
|
| Date Materialised |
|
|
|
|
Sectors submitted by the Researcher |
|
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
|
| Project URL: |
|
| Further Information: |
|
| Organisation Website: |
|