Microstructure and nanoindentation analysis of Mg-SiC nanocomposite powders synthesized by mechanical milling
| Autor: | Sepideh Kamrani, Alireza Ghasemi, D. Penther |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Nanocomposite Materials science Scanning electron microscope Mechanical Engineering 02 engineering and technology Nanoindentation 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Nanocrystalline material Mechanics of Materials 0103 physical sciences Volume fraction General Materials Science Composite material Severe plastic deformation 0210 nano-technology Elastic modulus |
| Zdroj: | Materials Characterization. 142:137-143 |
| ISSN: | 1044-5803 |
| Popis: | Mixtures of magnesium powder and SiC nanoparticles at various volume fractions were mechanically milled to produce nanocrystalline Mg-SiC nanocomposites. X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were utilized to characterize the microstructure of the milled powders. The microstructural evidences revealed that mechanical milling is a proper method to achieve a uniform distribution of the SiC nanoparticles, even up to 10% in the Mg matrix. Based on the results, higher volume fraction of the SiC nanoparticles raise the value of measured microstrain and reduce the crystallite size of the Mg matrix. The TEM results pointed to the fact that no deformation twinning takes place in the nanostructured Mg matrix even after severe plastic deformation through mechanical milling and the presence of hard SiC nanoparticles up to 10 vol%. The effects of nanoparticle volume fraction on mechanical properties of the milled Mg-SiC nanocomposites were evaluated using nanoindentation tests. The results clearly showed a significant enhancement of nanohardness and reduced elastic modulus in the milled powders compared to that of the reference material namely as-received pure magnesium. It was found that the SiC nanoparticles (even up to 10 vol%), well distributed in the magnesium matrix, remarkably improve the reduced elastic modulus and nanohardness of the nanocomposite powders. |
| Databáze: | OpenAIRE |
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