Understanding the Evolution of Nanoporosity in Alloy Systems using X-ray and Electron Techniques
- Abstract number
- 262
- Corresponding Email
- [email protected]
- Session
- Stream 4: Diamond Light Source Session 1
- Authors
- Dr Mohamed Koronfel (3, 2), Dr Camilla Stitt (3), Dr Eleanor Schofield (3, 5), Mr Stuart Aberdeen (3), Dr Nigel Kirby (1), Dr Paul Quinn (2), Dr Johanna Nelson Weker (4), Dr Micheal Toney (4, 6), Prof Alexandra Porter (3), Prof Mary Ryan (3)
- Affiliations
-
1. ANSTO
2. Diamond Light Source
3. Imperial College London
4. SLAC
5. Mary Rose Trust
6. University of Colorado
- Keywords
- Abstract text
The formation of nanoporous structures by selective removal of an active component of an alloy is an important process for both the development of novel functional nanomaterials, and for understanding the degradation behaviour of complex alloy systems. The structures that form are complex, 3-dimensionally interconnected porous networks that undergo self-similar coarsening to form highly reactive ‘sponge-like’ materials. The electrochemical nature of the process means that operando approaches are needed to follow the dynamics of formation, but the extremely small size of the pores means that high resolution imaging is required to fully elucidate the structures. In this talk we will discuss correlative approaches using both electron and X-ray techniques to study two examples of the dealloying phenomena: i) the reactivity of CoCr wear particle debris from metal hip implants and ii) the formation of nanoporous noble metals (Au, Pt). Dynamic imaging of the dealloying process, and well as operando studies of pore formation, and the accompanied strain dynamics in the system, will be presented.