The talk will be given by Prof. Eduardo Bringa (CONICET & Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Cuyo, Mendoza, Argentina)
Title: Materials under extreme conditions of stress and irradiation
Time: 14th Nov, 2014, 15:15
Place: FA31, AlbaNova Univ Center (http://www.biox.kth.se/contact/maps/map1.htm),
3rd floor (2 floors down if you enter from South and 2 up if from North)
Extreme conditions of stress and radiation can be found in many scenarios in nature, specially in space. In this presentation I will cover a few recent results on high strain rate loading of materials, with high pressure conditions relevant to astrophysical collisions. I will also present some results on irradiation of materials by ions with energies covering shocks (eV), magnetospheres (keV) and cosmic ray conditions (GeV). Irradiation conditions can often be achieved in accelerator facilities, and high strain rate conditions can be duplicated in experiments using high power lasers. Discussion will include a proposed method to measure supersonic dislocations under high stress using nano-indentation as a reliable dislocation source (Ruestes et al., submitted to Scientific Reports); shock-induced amorphization of Si (Zhao et al., submitted to Nature Materials); grain size and porosity effects in loading of metals; etc. Regarding irradiation, I will show the microstructure left behind by different projectiles, in different energy regimes, including strong electronic effects at the highest incident energy (Rivera et al, submitted to Phys. Rev. Lett.). Finally, I will discuss how that microstructure can sometimes change mechanical properties of the material.