Effect of the MgO particles on the nanocrystalline copper grain stability
| Autor: | Karel Saksl, Mária Orolínová, Juraj Ďurišin, Katarína Ďurišinová |
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| Rok vydání: | 2004 |
| Předmět: |
Materials science
Nanostructure Mechanical Engineering Metallurgy Oxide Condensed Matter Physics Microstructure Nanocrystalline material Grain growth chemistry.chemical_compound chemistry Mechanics of Materials Ultimate tensile strength Particle-size distribution General Materials Science Grain boundary Composite material |
| Zdroj: | Materials Letters. 58:3796-3801 |
| ISSN: | 0167-577X |
| DOI: | 10.1016/j.matlet.2004.07.031 |
| Popis: | The study is centred on the microstructure evolution in Cu–3 vol.% of MgO composite during the preparation of a nanocrystalline powder and its processing into a macroscopic compact and thermal loading. The effect of dispersed oxide phase on the preservation of the initial nanostructure is analysed. Due to the weak coherency of the Cu/MgO interface, the Cu matrix is not sufficiently controlled by the MgO during heating. Some portions of the oxide nanoparticles agglomerate into coarser particles (>50 nm), which are less efficient barrier against the grain growth. Fine particles retard the grain growth. The consolidation results in a bimodal grain size distribution with micrometre-sized grains embedded inside a matrix of nanocrystalline/ultrafine grains. The fine, dispersion-strengthened grains provide good strength, as expected from an extrapolation of the Hall–Petch relationship. The inhomogeneous microstructure induces strain-hardening mechanisms that stabilize tensile deformation, leading to high tensile ductility. |
| Databáze: | OpenAIRE |
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