Details

Autor(en) / Beteiligte

• Sweet, G.A.
• Brochu, M.
• Hexemer, R.L.
• Donaldson, I.W.
• Bishop, D.P.

Titel

Microstructure and mechanical properties of air atomized aluminum powder consolidated via spark plasma sintering

Ist Teil von

• Materials science & engineering. A, Structural materials : properties, microstructure and processing, 2014-07, Vol.608, p.273-282

Ort / Verlag

Kidlington: Elsevier B.V

Erscheinungsjahr

2014

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Two air atomized aluminum powders, one of commercial purity and the other magnesium-doped (0.4wt%), 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 (80mm) and small (20mm) 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.