|M.Sc Student||Eliash Tal|
|Subject||Correlation between Nano and Macro Mechanical Properties of|
Poly Crystalline Molybdenum
|Department||Department of Materials Science and Engineering||Supervisor||Professor Eugen Rabkin|
|Full Thesis text|
Grain Boundaries (GB) have a strong effect on properties of polycrystalline solids. The increase of hardness and of yield stress with decreasing average grain size is known as a Hall-Petch relationship. However, little is known about the microscopic plasticity mechanisms in the vicinity of individual GBs and their triple junctions. In this work we used the depth-sensing indentation technique to study the nanoscale mechanical properties of molybdenum in the vicinity of GBs and their triple junctions. We tested both the tricrystals prepared by electron beam floationg zone melting technique and ultrafine grained samples obtained by severe plastic deformation technique.
Main findings of this research are: