Abstract
Aluminium-based powder metallurgy (PM) alloys have a number of advantages over cast and wrought aluminium alloys. These PM alloys can be produced using either prealloyed or elemental premixes, with the latter offering a longer die life because of their softer nature compared with prealloyed powders. It is found that the use of an Al-Cu premixed PM alloy gives green density values higher than those of Al-Cu prealloyed systems reported in the literature. Most commercial aluminium PM alloys and alloy developments are based on the Al4Cu system. The amount of liquid phase has significant effects on the microstructure and the mechanical properties of sintered products. Lack of a liquid phase results in inadequate mechanical properties, while an excess of liquid phase causes distortion and shape deformation of the compacts formed by sintering. The objective of this study is to determine the properties of an Al4Cu PM alloy produced using an elemental premix. The effects of the amount of liquid phase on microstructural features and mechanical properties are assessed through thermal analyses. It is found that the optimum transverse rupture strength is obtained by sintering at 600 °C for 2 h.
Kurzfassung
Aluminiumbasierte Pulvermetallurgie-Legierungen (PM) haben gegenüber Guss- und Schmiede-Aluminiumlegierungen eine Reihe von Vorteilen. Diese PM-Legierungen können entweder mithilfe von vorlegierten oder elementaren Vormischungen hergestellt werden, wobei letztere eine längere Lebensdauer bieten, da sie im Vergleich zu vorlegierten Pulvern weicher sind. Es stellte sich heraus, dass durch die Verwendung einer vorgemischten Al-Cu PM-Legierung Anfangsdichtewerte erreicht werden, die höher sind als die von vorlegierten Al-Cu-Systemen, von denen in der Literatur berichtet wird. Die meisten kommerziellen Aluminium-PM-Legierungen und Legierungsentwicklungen basieren auf dem Al4Cu-System. Der Anteil an flüssiger Phase hat erhebliche Auswirkungen auf die Mikrostruktur und die mechanischen Eigenschaften von Sinterprodukten. Das Fehlen einer flüssigen Phase führt zu unzureichenden mechanischen Eigenschaften, während ein Überschuss an flüssiger Phase Verzerrungen und Deformationen der durch Sintern geformten Presskörper verursachen kann. Das Ziel dieses Beitrags besteht darin, die Eigenschaften einer Al4Cu PM-Legierung zu bestimmen, die mithilfe einer elementaren Vormischung hergestellt wurde. Die Auswirkungen der Menge an flüssiger Phase auf mikrostrukturelle Merkmale und mechanische Eigenschaften werden mithilfe von thermischen Analysen beurteilt. Es wurde festgestellt, dass durch Sintern für 2 h bei 600 °C die optimale Biegebruchfestigkeit erreicht wird.
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