Effect of alumina nanoparticle on strengthening of Al-Si alloy through dendrite refinement, interfacial bonding and dislocation bowing
| Autor: | T. P. D. Rajan, B.C. Pai, M. Riyas Mohammed, S. L. Arun Kumar, K. M. Sree Manu |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Nanocomposite Mechanical Engineering Alloy Metallurgy Metals and Alloys chemistry.chemical_element Nanoparticle 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology 01 natural sciences Corrosion Solid solution strengthening Compressive strength chemistry Mechanics of Materials Aluminium 0103 physical sciences Materials Chemistry engineering 0210 nano-technology High-resolution transmission electron microscopy |
| Zdroj: | Journal of Alloys and Compounds. 712:394-405 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2017.04.104 |
| Popis: | The present investigation evaluates the effect of varying percentage of alumina nanodispersions in strengthening and interfacial bonding with cast A356 aluminum alloy by modified compocasting followed by solidification using squeeze casting. Addition of 0.5 wt% Al 2 O 3 nanoparticles to cast alloy shows remarkable enhancement in the yield strength from 204 to 323 MPa. They also exhibit higher hardness, UTS, compressive strength, thermal, tribological and corrosion properties. HRTEM image showed the insertion of Al lattice into the Al 2 O 3 crystalline lattice contributing to strengthening of the alloy. The Al 2 O 3 nanoparticles and the β’’ are involved in the Orowan strengthening of Al nanocomposite. The presence of hard Al 2 O 3 nanoparticles and the stronger bonding between particle and alloy constrain the dislocation motion leading to dislocation bowing. The theoretical estimation of Al −0.5 wt% Al 2 O 3 nanocomposite yield strength shows that the contribution of Hall-Petch is predominant followed by Orowan and solid solution strengthening. |
| Databáze: | OpenAIRE |
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