Design, Test and Evaluation of Al-Cu-Mg Powder Metallurgy Alloy Relation between Microstructure and Corrosion Behaviour

摘要

The objective of this work is to develop an alloy P/M Al-4.4Cu-1.5Mg adequate for press-sintertechnology. The sintering cycle was developed applying a theoretical model by Thermocalc softwarein order to control the formation of liquid phase during Liquid Phase Sintering (LPS). Compaction at400MPa and sintering at 570º, 590º and 610º followed by solution treatment, quenching and naturalageing process was the procedure to produce the samples. SEM images and X-Ray Diffraction (XRD)have been performed. As well, the intermetallic (IM) particles have an important role on the corrosionresistance and they can give rise to localized corrosion, as pitting due to the formation of galvaniccells. Shape, size and chemical composition of the IM are finally determined by the processing route.In order to study and understand the corrosion mechanism involved several techniques wereemployed to characterize the corrosion behaviour of the alloy.