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Effect Of Impurities On Microstructure And Structural Propertiesof The As-Cast And Treated Al-Zn

Auteurs : DouniazedLamrous, Emanuelle Boehm-Courjault, Mohamed yacine Debili, NaciraSassane.
Année : 2014
Domaine : Métallurgie
Type : Publication
Revue : Association of Metallurgical Engineers of Serbia
Résumé en PDF : (résumé en pdf)
Fulltext en PDF : (.pdf)
Mots clés : Al-Zn, HF melting, Dendrites, CET, Impurities, Structural properties.

Résumé :

The microstructure of two Al-Zn alloys (with 10 and 30 wt.%Zn content) produced by melting in the high frequency induction furnace were investigated by means of scanning electron microscopy (SEM), energy dispersive X-ray (EDX) spectroscopy, X-ray diffraction (XRD) analysisand themicrohardness tests. The results indicate that the presence of iron impurity causes the formation of eutectic (Al,Zn)3Fe in both alloys. The presence of the silicon impurity results in the formation of the phase separation in the Al-10%Zn as-cast alloy. The columnar to equiaxed transition was produced only in the Al-30%Zn as-cast alloy. The Vickers microhardness is higher in the equiaxed zone than in the columnar to equiaxed transition (CET) zone. The presence of iron causes intermetallic phase formation (Al, Fe, Si) 3,6Zn in the Al-30%Zn as-cast alloy enabling an increase in the lattice parameter. After a homogenization treatment, the microstructure of Al-Zn treated alloys consists only of αdendrites and stable eutectic phase.