Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2011 - zeszyt 1

Impact of strain rate on Cu mechanical properties

nr katalogowy: 57713

Materials with ultrafine-grained (UFG) structure have been studied in the last few years because of their unique properties. The main feature of UFG metals is grain size diameter which is below as 1 μm. Considering that grain size reduces to nanometer range, the materials exhibit unique mechanical and physical properties. They have high strength and wear resistance, good ductility at room temperature and superplasticity at elevated temperature [1, 2]. At the same time they have demonstrated properties as a decrease in the elastic moduli, the decrease of the Curie temperature, enhanced diffusivity and improved magnetic properties [1, 3, 4]. The severe plastic deformation methods have been applied to UFG materials formation. The ECAP, ECAP-BP, HPT, ARB are well known technologies nowadays and have been successfully used to structure formation with grain size ~70÷500 nm [5÷7]. The unique properties of UFG metals are connected with specific microstructures features. The UFG microstructure created during SPD processes is formed by dislocations arrangement - “dislocation cell structure“ having mostly low angle boundaries [8]. Based on Valiev’s study [1], during metal processing via SPD great amount of dislocations is introduced to material resulting in high level of internal stresses and elastic distortion of crystal lattice near a boundary. Consequently, the grains boundaries are in the non-equilibrium state and deformation mechanism as grain boundary sliding and grain rotation would be enhanced. The final UFG structure contains huge amount of grain boundaries with mainly high-angle misorientations [9]. The small grain size and great density of defects (as dislocations, vacancies, triple junctions) in UFG materials cause higher strength properties achievement. At the same time, some experimental results show occurrence of superplasticity at lower temperature as well as at high strain rate in UFG metals [10, 11[...]

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