Materials with multiple length-scale structures are a fascinating yet critical class of materials that have characteristic dimensions spanning from nano- to macro-scales. These materials have enormous potential for nuclear and energy applications as they can display unique properties such as combinations of strength and toughness at ambient to elevated temperatures.
Taking nuclear grade graphite as an example, which is a porous graphite used as the moderator and structural component in UK nuclear power reactors, Dong will talk about how to obtain its 3D microstructure information and extract its mechanical properties, in real time, at elevated temperatures (e.g. 1273 K [1000 °C]) using a technique called synchrotron X-ray computed microtomography. It was found that, at reactor operating temperatures, the material has an unusually higher strength and resistance to crack growth than at ambient temperatures. The mechanisms that are responsible for this behaviour relate to the relaxation of internal stresses. In addition, Dong will show you other examples of structural materials, such as ceramic-based composites, and how one can capture the in situ damage and fracture development in these materials at temperatures relevant to their service conditions. (e.g., at 1473 K [1200 °C] and higher).
Arrive for 19:30 on Monday Sep 4, 2017
Members and non-members are welcome.
The talk will be followed by a discussion and buffet.