Caracterización microestructural, propiedades mecánicas y comportamiento frente a la corrosión de aleaciones Mg–4Al–Ca–Zn–0,4Mn laminadas en caliente

Yousef  Fhail Boom; Ali  Güngör

doi:10.3989/revmetalm.e287.1737

Authors

Yousef Fhail Boom Karabuk University, Engineering Faculty, Metallurgical and Materials Engineering Department https://orcid.org/0009-0005-3609-965X
Ali Güngör Karabuk University, Engineering Faculty, Metallurgical and Materials Engineering Department https://orcid.org/0000-0001-7649-4308

DOI:

https://doi.org/10.3989/revmetalm.e287.1737

Keywords:

Corrosion, Hot-Rolled, Magnesium, Mechanical Properties, Microstructure, Phase Formation

Abstract

This study examines systematic microstructural evolution, mechanical behavior and corrosion resistance of Mg-4Al-X₁Ca-X₂Zn-0.4Mn alloys, where calcium (Ca), X₁ = 0.5 and 0.8, and zinc (Zn), X₂ = 0.8 and 1.2 wt.%. The three alloys were fabricated by gravity die casting, thereafter, undergoing homogenization and hot rolling. Their characterization was performed using X-ray fluorescence (XRF), X-ray diffraction (XRD), and scanning electron microscopy combined with energy dispersive spectroscopy (SEM-EDX). The characterization process included pole figure analysis, hardness evaluation, tensile and immersion corrosion tests. Microstructural and XRD analysis indicated that a primary α-Mg matrix with Mg₁₇Al₁₂, Al₂Ca, Ca(Al_1.34, Mg_0.66), and Al₈Mn₅ intermetallic phases. AZXM4110B alloy, containing highest Ca and Zn, achieved the best balance of strength and ductility. The YS and UTS values of this alloy reached 155.8 MPa and 256.6 MPa in the rolling direction (RD) with 8.7% fracture strain. The hardness tests indicated that AZXM4110B alloy had also the lowest value, with an average of 61.0 HV. The corrosion resistance in the 3.5% NaCl solution indicated AZXM4110A alloy with the highest Zn content showed the lowest corrosion rates of 25.8, 11.4, and 15.4 mm/year, respectively, at 24, 72, and 120 hours.

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