The contribution to the critical shear stress of nanocomposites caused by the interaction between screw dislocations and nanoscale circular cylindrical inclusions with interface stresses was derived by means of the Mott and Nabarro's model. The effect of the radius of the nanoscale inclusion and the volume fraction of inclusions as well as the interface stress on the critical shear stress was examined. The most important finding was that, when the negative interface stress was considered, a critical value of the radius of the nanoscale inclusion or the volume fraction of inclusions might exist to gain the best strengthening effects for the second-phase strengthened composites which differs from the classical solution without considering the interface stress under same external conditions.

Contribution to Critical Shear Stress of Nanocomposites Produced by Interaction of Screw Dislocation with Nanoscale Inclusion. Q.H.Fang, Y.Liu, B.Y.Huang, Y.W.Liu, P.H.Wen: Materials Letters, 2008, 62[20], 3521-3