Microstructure-Based Assessment of the Corrosion Fatigue Behavior of the Creep-Resistant DieMag422 and AE42 Magnesium Alloys

Martin Klein; Patrick Buhr; Frank Walther

doi:10.4028/www.scientific.net/SSP.258.530

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Microstructure-Based Assessment of the Corrosion Fatigue Behavior of the Creep-Resistant DieMag422 and AE42 Magnesium Alloys
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Microstructure-Based Assessment of the Corrosion Fatigue Behavior of the Creep-Resistant DieMag422 and AE42 Magnesium Alloys

Abstract:

Magnesium alloys offer high potential for lightweight constructions, e.g. in automotive applications. However, their application range is limited due to their low corrosion resistance. In the present study, the influence of corrosion on the microstructure and the depending mechanical properties under cyclic loading were characterized for the creep-resistant DieMag422 (Mg4Al2Ba-2Ca) and AE42 magnesium alloys. In this context, fatigue properties in distilled water and sodium chloride solutions were assessed in constant amplitude tests. The results were correlated with corrosion properties of the alloys, which were evaluated by immersion tests. Corrosion-and deformation-induced microstructural changes were observed by light and scanning electron microscopy (SEM), yielding a structure-property-relationship for a comprehensive understanding of mechanical and corrosive deterioration mechanisms.