The mean free path of dislocations in nanoparticle and nanorod reinforced metal composites and implication for strengthening mechanisms |
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| Authors: | Guoxin Cao Xi Chen Jeffrey W. Kysar Dongyun Lee Yong X. Gan |
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| Affiliation: | aNanomechanics Research Center, MC 4709, Department of Civil Engineering and Engineering Mechanics, Columbia University, New York, NY 10027, USA;bDepartment of Mechanical Engineering, Columbia University, New York, NY 10027, USA;cDepartment of Mechanical Engineering, Cooper Union, New York, NY 10003, USA |
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| Abstract: | The mean free path length of dislocations plays an important role in the plastic behavior of metals, which may be significantly enhanced by the addition of nanoparticles. The effects of particle distribution pattern, particle size, shape and volume fraction on the dislocation mean free path length and average obstacle distance are analyzed in two- and three-dimensional models. As the particle volume fraction increases, the dislocation mean free path length and average distance between dislocations obstacles can be significantly reduced, implying enhancement of strength. The random particle distribution exhibits the best combination of dislocation mean free path length and average obstacle distance. In addition, both dislocation mean free path and average obstacle distance can be significantly reduced by changing the particle shape from nanosphere to nanorod. The present analysis may provide useful information for designing the particle enforced composite materials. |
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| Keywords: | Composite Nanoparticle Nanorod |
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