In Situ Synthesis of Nanocrystalline Intermetallic Compound Layer During Surface Mechanical Attrition Treatment of Zirconium


Autoria(s): Sun CY(孙彩云); Xie JJ(谢季佳); Wu XL(武晓雷); Hong YS(洪友士); Liu G; Lu J; Lu K
Data(s)

25/10/2004

Resumo

The surface mechanical attrition treatment (SMAT) technique was developed to synthesize a nanocrystalline (NC) layer on the surface of metallic materials for upgrading their overall properties and performance. In this paper, by means of SMAT to a pure zirconium plate at the room temperature, repetitive multidirectional peening of steel shots (composition (wt%): 1C, 1.5Cr, base Fe) severely deformed the surface layer. A NC surface layer consisting of the intermetallic compound FeCr was fabricated on the surface of the zirconium. The microstructure characterization of the surface layer was performed by using X-ray diffraction analysis, optical microscopy, scanning and transmission electron microscopy observations. The NC surface layer was about 25 mu m thick and consisted of the intermetallic compound FeCr with an average grain size of 25 +/- 10 nm. The deformation-induced fast diffusion of Fe and Cr from the steel shots into Zr occurred during SMAT, leading to the formation of intermetallic compound. In addition, the NC surface layer exhibited an ultrahigh nanohardness of 10.2 GPa.

Identificador

http://dspace.imech.ac.cn/handle/311007/13820

http://www.irgrid.ac.cn/handle/1471x/6634

Idioma(s)

英语

Fonte

Proceedings of the 14th Congress of the International-Federation-for-Heat-Treatment-and-Surface-Engineering, Pages: 1242-1246

Palavras-Chave #力学
Tipo

会议论文