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Abstract
This paper presents the results of density measurements carried out on Alumix sintered parts. ECKA Alumix aluminium powders were used because of their wide application in the powder metallurgy industry. The compacts were produced using a wide range of compaction pressures for three different chemical compositions. The compacts were then sintered under a pure dry nitrogen atmosphere at three different temperatures. The heating and cooling rates were the same throughout the entire test. The results showed that the green density increases with compaction pressure, but that sintered density is independent of green density (compaction pressure) for each sintering temperature.
Highlights
PM aluminium alloys have growing potential in the automotive industry, because desired properties of structural components can be achieved at relatively low cost
The purpose of this research work was to study the influence of various process parameters on the densification behavior of various aluminium alloy powders
It is evident that green density increases with compaction pressure
Summary
PM aluminium alloys have growing potential in the automotive industry, because desired properties of structural components can be achieved at relatively low cost. The alloying elements were introduced as elemental powders, or in the form of master alloys, since prealloyed powders are incompressible and cause some technological problems during sintering. Developments in aluminium-silicon alloys remain an area of intense interest. Silicon additions are made to aluminium casting alloys in order to increase the fluidity of the molten alloy. The addition of silicon to aluminum alloys in PM technology offers some advantages in the production cycle over casting, in in its ability to produce hypereutectic alloys with a relatively fine silicon particle, which can for example provide wear-resistant products. With the use of proper sintering parameters, densities of almost 99 % of the theoretical density can be achieved [1–5]. The purpose of this research work was to study the influence of various process parameters on the densification behavior of various aluminium alloy powders
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