Microstructure and mechanical properties of air atomized aluminum powder consolidated via spark plasma sintering
| Autor: | Ian W. Donaldson, G.A. Sweet, R.L. Hexemer, Donald Paul Bishop, Mathieu Brochu |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
010302 applied physics
Materials science Hydrogen Mechanical Engineering Metallurgy chemistry.chemical_element Sintering Spark plasma sintering 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Brittleness chemistry Mechanics of Materials Aluminium 0103 physical sciences Ultimate tensile strength General Materials Science 0210 nano-technology Ductility |
| Zdroj: | Materials Science and Engineering: A. 608:273-282 |
| ISSN: | 0921-5093 |
| Popis: | Two air atomized aluminum powders, one of commercial purity and the other magnesium-doped (0.4 wt%), were processed by SPS and conventional PM means. An investigation of SPS processing parameters and their effect on sinter quality were investigated. A comparison with conventionally processed PM counterparts was also conducted. Applied pressure and ultimate processing temperature bore the greatest influence on processing, while heating rate and hold time showed a minor effect. Full density specimens were achieved for both powders under select processing conditions. To compliment this, large (80 mm) and small (20 mm) diameter samples were made to observe possible up-scaling effects, as well as tensile properties. Large samples were successfully processed, albeit with somewhat inferior densities to the smaller counterparts presumably due to the temperature inhomogeneity during processing. An investigation of tensile properties for SPS samples exhibited extensive ductility (~30%) at high sintering temperatures, while lower temperature SPS samples as well as all PM processed samples exhibited a brittle nature. The measurement of residual oxygen and hydrogen contents showed a significant elimination of both species in SPS samples under certain processing parameters when compared to conventional PM equivalents. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect