Advances and Improvement in Corrosion-Fatigue Resistance of Magnesium Alloy

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Metal Failure Analysis".

Deadline for manuscript submissions: closed (31 July 2022) | Viewed by 3848

Special Issue Editors


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Guest Editor
Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, GA 30332, USA
Interests: alloy development; metal additive manufacturing; heat treatment; fatigue failure; crack growth; fatigue modeling
Special Issues, Collections and Topics in MDPI journals

E-Mail Website
Guest Editor
Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, GA 30332, USA
Interests: metal additive manufacturing; defectology; inequilibrium solidification; materials characterization; deformation behavior; texture
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Magnesium (Mg) alloys are the lightest engineering materials and are attractive to the automotive, aerospace, and electronics industries for their potential to reduce the weight of various components. However, they have high chemical reactivity and are susceptible to reacting with oxides, chlorides, and sulfides. Additionally, they have poor wear, low oxidation resistance, and low corrosion resistance. Combined, these drawbacks limit their suitability for several applications. In the automotive industry to date, the use of Mg as a structural material has primarily been limited to trimming parts and a few structural parts. To fully exploit the potential benefits of Mg, its application into load-bearing parts must be considered. The main obstacle preventing the further application of Mg alloys is their electrochemical reactivity and its associated low corrosion resistance, which limits their application in humid conditions and aqueous environments. This leads to practical issues related to the application of Mg alloys for the manufacture of structural components, which experience cyclic loading in service. Therefore, the corrosion fatigue resistance of Mg alloys needs to be significantly improved for the transportation industries to take full advantage of the benefits of Mg alloys in light-weighting

This Special Issue will address the development of corrosion protection of Mg alloys to improve fatigue performance in a harsh environment. It will also cover insights into microstructural phenomena leading to the mechanical properties of the manufacturing process and alloy development of the Mg alloys. Researchers who are modeling and simulating the fatigue performance of Mg alloys involving microstructural features, as well as those performing experimental studies, are welcomed to submit papers.

Dr. Sugrib Kumar Shaha
Dr. Dyuti Sarker
Guest Editors

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Keywords

  • alloy development
  • surface modification
  • heat treatment
  • phase transformation
  • microstructure
  • corrosion resistance
  • fatigue fracture
  • crack growth

Published Papers (2 papers)

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Research

12 pages, 1983 KiB  
Article
Solid-State Additive Deposition of AA7075 on AZ31B Substrate: Heat Treatment to Improve the Corrosion Fatigue Resistance
by Sugrib Kumar Shaha, Dyuti Sarker and Hamid Jahed
Metals 2022, 12(10), 1578; https://doi.org/10.3390/met12101578 - 23 Sep 2022
Cited by 1 | Viewed by 928
Abstract
The influence of heat treatment on the coating microstructure, nanomechanical, and corrosion fatigue properties of solid-state deposition of AA7075 aluminum alloy on AZ31B cast Mg alloy is studied in detail. Transmission electron microscopy (TEM) microstructural analysis shows columnar grain at the interface of [...] Read more.
The influence of heat treatment on the coating microstructure, nanomechanical, and corrosion fatigue properties of solid-state deposition of AA7075 aluminum alloy on AZ31B cast Mg alloy is studied in detail. Transmission electron microscopy (TEM) microstructural analysis shows columnar grain at the interface of AA7075/AZ31B. Electron backscatter diffraction (EBSD) observation discovered elongated grains with a high fraction of deformed grain boundaries as-deposited and heat-treated at 200 °C conditions. In contrast, the annealed samples show recrystallized grains with increasing temperatures from 200 °C to 400 °C. The residual stress of the coating at the surface and subsurface measured by X-ray diffraction shows −55 MPa and −122 MPa, respectively, which transferred to tensile with increasing the annealing temperature up to 400 °C. Annealing treatment of the AA7075 coating considerably improved the nanomechanical properties and corrosion fatigue resistance. With increasing the annealing temperature from 200 °C to 400 °C, the hardness of the coating decreased, while the modulus increased significantly. The analysis of fatigue fracture surfaces revealed that corrosive solution entered through the cracks and accelerated the crack propagation, lowering the fatigue life. However, the presence of recrystallized grains improved the corrosion fatigue resistance. Full article
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18 pages, 6459 KiB  
Article
Corrosion Protection of ZK60 Wrought Magnesium Alloys by Micro-Arc Oxidation
by Yuna Xue, Xin Pang, Seyyed Mohamad Hasan Karparvarfard, Hamid Jahed, Sheji Luo and Yi Shen
Metals 2022, 12(3), 449; https://doi.org/10.3390/met12030449 - 04 Mar 2022
Cited by 8 | Viewed by 2195
Abstract
The influences of the forging process and micro-arc oxidation (MAO) coating on the corrosion behavior of ZK60 wrought magnesium alloys exposed to salt spray and constant stress corrosion conditions were investigated. The microstructure of the ZK60 Mg alloy specimens forged under different temperatures [...] Read more.
The influences of the forging process and micro-arc oxidation (MAO) coating on the corrosion behavior of ZK60 wrought magnesium alloys exposed to salt spray and constant stress corrosion conditions were investigated. The microstructure of the ZK60 Mg alloy specimens forged under different temperatures (i.e., 250, 300, and 450 °C) was characterized using metallography, EBSD, and SEM. It was demonstrated that the ZK60 alloy forged at 300 °C (i.e., ZK60EF-300) had finer grain and uniformly distributed β-phase and, thus, better corrosion resistance than the ZK60 forged at 450 °C. At the lower forging temperature (250 °C) twins formed in the ZK60 alloy, which accelerated the corrosion of the ZK60E-250 specimen. The MAO coating provided robust corrosion protection for all the ZK60 wrought Mg alloy substrates. The salt spray corrosion test results showed that when the MAO coating broke down at certain weak sites, the corrosion performance of the coated Mg alloy was predominantly determined by the alloy substrate. The stress corrosion behaviors of the uncoated and MAO-coated ZK60 alloy specimens were also investigated under a constant load of 80 MPa in 3.5 wt.% NaCl solution. The MAO coating was found to improve the stress-corrosion resistance of the ZK60 alloy pronouncedly. Full article
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