IMECH-IR  > 力学所知识产出(1956-2008)
Synthesis of nanocrystalline intermetallic layer by mechanical attrition
Wu XL(武晓雷); Hong YS(洪友士); Tao N; Meng XK; Lu J; Lu K
Source PublicationTMS Annual Meeting
Conference Name135th TMS Annual Meeting, 2006
Conference DateMarch 12, 2006 - March 16, 2006
Conference PlaceSan Antonio, TX, United states
AbstractBy means of the technique of surface mechanical attrition treatment, the nanocrystalline (nc) intermetallic compound Co3Fe7 was synthesized in the surface layer of bulk cobalt. It was found that deformation-induced diffusion occurred, leading to the extension of solid solution. A series of phase transformation proceeded with increasing Fe content (atom percent) and followed the route from hcp (less than 4 percent Fe) to fee (4-11 percent Fe) and finally to bcc (> 11% Fe). Nanoscale composition analyses by EDX showed that Fe contents are significantly higher in grain boundaries and triple junctions than in grain interiors. It was turned out to be the conclusion that fast diffusion along grain boundaries dominate in larger grains whereas diffusion along triple junctions in nc intermetallic grains. The alloying on the atomic level was ascribed to deformation-induced intermixing during deformation at high strain rates. The mechanism of intermetallic formation was a result of numerous nucleation events followed by limited growth.
KeywordIntermetallic Grains Mechanical Attrition Surface Mechanical Attrition Treatment
Indexed ByEI
Document Type会议论文
Recommended Citation
GB/T 7714
Wu XL,Hong YS,Tao N,et al. Synthesis of nanocrystalline intermetallic layer by mechanical attrition[C]TMS Annual Meeting,2006.
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