Talk given by

Dr. Ivan Lomakin
Laboratory for mechanics of bulk nanostructured materials
Saint Petersburg University
Russia

Abstract:

A complex study of aging kinetics for both coarse-grained and nanostructured by 
severe plastic deformation Cu – 2 wt.% Be alloy will be reported. The severe 
plastic deformation led to the formation of a single-phase nanograined 
microstructure with an average grain size of 20 nm and 390 HV. It was found that 
this grain size was slightly driven by grain boundary segregation. Significant 
age hardening with a maximum hardness of 466 HV for the aged nanostructured 
alloy was observed. Mechanical tests result revealed a strong influence of 
microstructure and further aging on strength capability of the alloy for both 
coarse-grained and nanostructured alloy. A good thermal stability in the 
nanostructured alloy was also noticed. It was shown that light alloying elements 
could be used for direct change of microstructure and aging behaviour of 
severely deformed copper alloys. In addition, a brief introduction of the 
laboratory for mechanics of bulk nanostructured materials of Saint Petersburg 
University with focus on experimental and processing facilities will be done.