Manufacturing Of Mg|Si Graded 6xxx Aluminium Alloys Using Spark Plasma Sintering Of Model Alloys Powder Blends

Authors:

Justine Taurines (INSA Lyon, France),
Xavier Boulnat (MATEIS – UMR CNRS 5510, France),
Olivier Dezellus (LMI – UMR CNRS 5615, France),
Alexis Deschamps (SIMAP – UMR CNRS 5266, France)

Abstract:

In this study, a compositionally-graded aluminium alloy was obtained by high-temperature consolidation using Spark Plasma Sintering (SPS) of Al-Si and Al-Mg model alloys atomised powders. The fabrication process includes: (i) SPS consolidation of multi-layer powder beds (ii) interdiffusion heat treatment (iii) homogenisation and quenching. Energy dispersive X-ray spectroscopy (EDX) and wavelength dispersive X-ray spectroscopy (WDS) ensure a well-controlled gradient in a single direction. X-ray tomography and microscopy analysis describe the microstructure evolution of the alloys depending on the chosen diffusion couple. Parts made with Al-2.6wt.%Mg and Al-2.5wt.%Si powder blends reach the targeted Mg-Si gradient length of 3 mm after an interdiffusion treatment of 10 days at 550°C, with a relative density of 99.5%. These graded alloys allow for systematic study of nanoscale-precipitation in 6xxx alloys with various Mg|Si ratios.

DOI:

https://doi.org/10.59499/WP225370187