Grain growth characteristics and its effect on deformation behavior in nanocrystalline Ni
- Resource Type
- Article
- Authors
- Sharma, Garima; Varshney, Jalaj; Bidaye, A.C.; Chakravartty, J.K.
- Source
- Materials Science & Engineering: A. Mar2012, Vol. 539, p324-329. 6p.
- Subject
- *CRYSTAL growth
*DEFORMATIONS (Mechanics)
*NANOCRYSTALS
*CHEMICAL kinetics
*DIFFERENTIAL scanning calorimetry
*ELECTRICAL resistivity
*ACTIVATION energy
*HARDNESS
*TEMPERATURE effect
- Language
- ISSN
- 0921-5093
Abstract: The grain growth characteristics and its effect on deformation behavior of nanocrystalline(nc)-Ni having a grain size of 60nm have been studied. The kinetics of thermal grain growth was studied by DSC and resistivity experiments. Thermal instability leading to grain growth in nc-Ni was assessed by determining the activation energy required for grain growth in the temperature range of 100–400°C. The activation energy was found to be ∼100kJ/mol below Curie temperature and ∼298kJ/mol above Curie temperature. The effect of grain size on nano-hardness and loading rate was investigated using nanoindentation technique. The deformation parameters like strain rate sensitivity (m) and activation volume () for different grain sizes in nc-Ni were also evaluated. The interaction of dislocations-grain boundaries mediated mechanism was appeared to be the rate controlling plastic deformation mechanism. [Copyright &y& Elsevier]