Crack Blunting through Lattice Dislocation Slip in Nanocrystalline and Ultrafine-Grained Materials

Abstract:

Article Preview

The grain size effect on blunting of cracks in nanocrystalline and ultrafine-grained materials (UFG) is theoretically described. Within our description, lattice dislocations emitted from cracks are stopped at grain boundaries. The stress fields of these dislocations suppress further dislocation emission from cracks in nanocrystalline and UFG materials, and the suppression depends on grain size. The dependences of the number of dislocations emitted by a crack on grain size (ranging from 10 to 300 nm) in Cu and 3C-SiC (the cubic phase of silicon carbide) are calculated which characterize the grain size effect on crack blunting that crucially influences ductility of these materials.

Info:

Periodical:

Materials Science Forum (Volumes 633-634)

Edited by:

Yonghao Zhao and Xiaozhou Liao

Pages:

55-62

DOI:

10.4028/www.scientific.net/MSF.633-634.55

Citation:

I. A. Ovidko and A.G. Sheinerman, "Crack Blunting through Lattice Dislocation Slip in Nanocrystalline and Ultrafine-Grained Materials", Materials Science Forum, Vols. 633-634, pp. 55-62, 2010

Online since:

November 2009

Export:

Price:

$35.00

In order to see related information, you need to Login.

In order to see related information, you need to Login.