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Contribution to critical shear stress of nanocomposites produced by interaction of screw dislocation with nanoscale inclusion |
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| Authors: | QH Fang Y Liu YW Liu |
| Affiliation: | a State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, PR China b College of Mechanics and Aerospace, Hunan University, Changsha, 410082, PR China c Department of Engineering, Queen Mary, University of London, London, EI 4NS, UK |
| Abstract: | The contribution to the critical shear stress of nanocomposites caused by the interaction between screw dislocations and nanoscale circular cylindrical inclusions with interface stresses is 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 is examined. The most important finding is that, when the negative interface stress is considered, a critical value of the radius of the nanoscale inclusion or the volume fraction of inclusions may 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. |
| Keywords: | Defects Composite materials Screw dislocation Nanoscale inclusion Interface stress |
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