Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/18324
Title: Microstructural evolution and formation of nanocrystalline intermetallic compound during surface mechanical attrition treatment of cobalt
Authors: Wu, XL
Tao, NR
Wei, QM
Jiang, P
Lu, J
Lu, K
Keywords: Diffusion
Intermetallics
Nanocrystalline materials
Surface mechanical attrition
Issue Date: 2007
Publisher: Pergamon-Elsevier Science Ltd
Source: Acta materialia, 2007, v. 55, no. 17, p. 5768-5779 How to cite?
Journal: Acta Materialia 
Abstract: Nanocrystalline intermetallic Co 3Fe 7 was produced on the surface of cobalt via surface mechanical attrition (SMA). Deformation-induced diffusion entailed the formation of a series of solid solutions. Phase transitions occurred depending on the atomic fraction of Fe in the surface solid solutions: from hexagonal close-packed (<4% Fe) to face-centered cubic (fcc) (4-11% Fe), and from fcc to body-centered cubic (>11% Fe). Nanoscale compositional probing suggested significantly higher Fe contents at grain boundaries and triple junctions than grain interiors. Short-circuit diffusion along grain boundaries and triple junctions dominate in the nanocrystalline intermetallic compound. Stacking faults contribute significantly to diffusion. Diffusion enhancement due to high-rate deformation in SMA was analyzed by regarding dislocations as solute-pumping channels, and the creation of excess vacancies. Non-equilibrium, atomic level alloying can then be ascribed to deformation-induced intermixing of constituent species. The formation mechanism of nanocrystalline intermetallic grains on the SMA surface can be thought of as a consequence of numerous nucleation events and limited growth.
URI: http://hdl.handle.net/10397/18324
DOI: 10.1016/j.actamat.2007.06.030
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