Spark plasma sintering of prealloyed aluminium powders

作者：Chua A S; Brochu M; Bishop D P^*

来源：Powder Metallurgy, 2015, 58(1): 51-60.

DOI：10.1179/1743290114Y.0000000105

• Aluminium powder metallurgy
• Spark plasma sintering
• 2024
• 7075
• Mass spectrometry
• Residual impurities

The central objective of this research was to assess the effects of temperature and particle size on the spark plasma sintering (SPS) response of two prealloyed aluminium powders atomised from wrought alloys AA 2024 and AA 7075. A SPS temperature of 400 degrees C was found to yield fully dense specimens of both alloys with hardness values that were comparable to the starting wrought ingot materials. Such samples also exhibited appreciably lower concentrations of residual oxygen and hydrogen when compared to those present in the raw powders. Degassing experiments completed through thermogravimetric analyser (TGA)-gas chromatography (GC)-mass spectrometry (MS) indicated that the release of CO2 and adsorbed/chemisorbed H2O were responsible for the enhanced purity of the SPS products. Particle size was also a factor of influence with the most favourable results for density and minimised O/H concentrations achieved with particles >= 180 mu m in diameter.

• 出版日期2015-3
• 单位McGill