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Design, test and evaluation of Al-Cu-Mg powder metallurgy alloy. Relation between Microstructure and Corrosion behavior.

  • : Diogenes Carbonell1, Amaya García-Casas1, Antonia Jimenez-Morales1, Javier Izquierdo2, Ricardo Souto2
  • : 1Universidad Carlos III de Madrid, 2Universidad de La Laguna
  • : PDF Download
  • : 2014

Abstract

The objective of this work is to develop an alloy P/M Al-4.4Cu-1.5Mg adequate for press-sinter technology. The sintering cycle was developed applying a theoretical model by Thermocalc software in order to control the formation of liquid phase during Liquid Phase Sintering (LPS). Compaction at 400MPa and sintering at 570º, 590º and 610º followed by solution treatment, quenching and natural ageing 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 corrosion resistance and they can give rise to localized corrosion, as pitting due to the formation of galvanic cells. 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 were employed to characterize the corrosion behaviour of the alloy.

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