Effect of Aging on Corrosion Resistance of AZ31 Magnesium Alloy

This study investigated the susceptible sites for pit nucleation in a transformation-induced plasticity (TRIP) Fe39Mn20Co20Cr15Si5Al1 (at.%) high-entropy alloy (HEA) in 3.5 wt.% NaCl solution. The investigation involved a constant-load stress corrosion cracking (SCC) experiment. The SCC testing was interrupted at different pre-determined time intervals to characterize the specimen surface using a scanning electron microscope (SEM), electron backscattered diffraction (EBSD), and a three-dimensional optical stereomicroscope. The EBSD results revealed pit nucleation at the susceptible γ–ε interphase and ε–ε interlath/plate boundaries. The three-dimensional profile and SEM results indicated an increase in pit depth with no change in pit diameter on the surface of the specimen as the experiment progressed over time. This study highlights the importance of microstructural features and mechanical loading in the corrosion behavior of TRIP HEAs, providing insights into the mechanisms of pit nucleation and growth under aggressive environmental conditions.

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Microstructure and Properties of Al Foil Wrapped AZ31 Plate Prepared by Hot Pressing and Annealing

Shang,

Yuan,

et al. 2024

Metals

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In this work, an Al foil wrapped AZ31 plate was fabricated by direct hot pressing with a thickness reduction of 50% at 300 °C. Effective metallurgical bonding was produced at the Mg/Al interface and no obvious defects were found. Annealing treatment at 400 °C can generate two continuous intermetallic compound layers (Al3Mg2 on the Al side and Mg17Al12 on the Mg side) at the bonding interface. As annealing time increases, the intermetallic compound layers thicken, accompanied by the thinning and disappearance of the pure Al layer. After annealing for 8 h, a thick coating with the Al3Mg2 and Mg17Al12 mixture is formed on the surface of Mg plate. The micro-hardness of the intermetallic compound layers is much higher than that of the AZ31-substract and pure aluminum layer. Thus, the prolonged annealing (>4 h) can greatly increase the surface hardness. Compared with the as-received AZ31 sample, the corrosion resistance of the Al foil wrapped AZ31 plate can also be greatly improved. As annealing time increased from 0.5 to 8 h, the corrosion resistance showed a slightly decrease. In the present work, the sample annealed for 4 h gave the best consideration to surface hardness and corrosion resistance.

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Effect of Aging on Corrosion Resistance of AZ31 Magnesium Alloy

Cited by 3 publications

References 63 publications

Microstructure Evolution and Mechanical Behavior of AZ31 Magnesium Alloy Sheet with Bimodal Texture under Bending Deformation

Microstructure Evolution and Mechanical Behavior of AZ31 Magnesium Alloy Sheet with Bimodal Texture under Bending Deformation

Early Stages of Crack Nucleation Mechanism in Fe39Mn20Co20Cr15Si5Al1 High-Entropy Alloy during Stress Corrosion Cracking Phenomenon: Pit Initiation and Growth

Microstructure and Properties of Al Foil Wrapped AZ31 Plate Prepared by Hot Pressing and Annealing

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