Formation of nanocrystalline structure in tantalum by sliding friction treatment
Source abstract
Abstract
Abstract We have investigated the microstructural evolution as a function of depth from the surface of a pure tantalum plate subjected to sliding friction treatment (SFT), which is suggested to be a low-cost, simple and efficient severe plastic deformation technique to produce nanocrystalline structure on the surface of metals. A differential scanning calorimetry was used to examine the thermal stability of the microstructure. A transmission electron microscope was used to analyze the different microstructure features as a function of the depth from the surface. Details of the microstructural evolution were discussed and mechanisms were suggested. With an increasing depth from the treated surface, a progressive change in the microstructure from nano-grains to micro-grains was found, which is proposed to be dominated by dislocation activities.
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