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Abstract
This article investigates the microstructure evolution and corrosion response of surface mechanical attrition treated (SMAT) AZ91D magnesium alloy. In-depth transmission electron microscopy and combined isothermal calorimetry and pressure measurement technique, a novel and powerful tool for in situ monitoring of the magnesium corrosion process, are explored in the present study. A gradient structured layer of ~ 500 µm thickness with improved (~2.5 times) surface hardness is successfully obtained on the AZ91D alloy surface. SMAT introduces compressive residual stress in the treated layer. TEM results confirmed nanoscale grains of ~125 nm in topmost region and multiple deformation twin-modes, including 101¯2 〈101¯1〉 dense twins and 101¯1 – 101¯2 double twinning in SMATed layer. Twining of secondary twins is established in the TEM analysis. Moreover, a twin density gradient is evident within the treated layer, where it decreases with an increase in depth. After 24 h of immersion in 0.9% NaCl solution, the average corrosion rate of SMATed and non-SMATed specimens is ~11.0 and ~3.8 mm/year, respectively. The corrosion product on non-SMATed specimens has densely packed nano-flakes morphology; however, the SMATed surface shows two different morphologies: sparse nanowires and porous honeycomb-like structure. The SMATed specimen's lower corrosion resistance is attributed to the combined effect of the high density of defects, rougher surface, and smaller volume fraction of β phase at the surface.
Original language | English |
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Article number | 160659 |
Journal | Journal of Alloys and Compounds |
Volume | 882 |
DOIs | |
Publication status | Published - 2021 Nov 15 |
Bibliographical note
Funding Information:The authors would like to acknowledge Science and Engineering Research Board (SERB) [Grant number EMR/2017/001196], Swedish Research Council [Vetenskapsr?det: Grant number 2016/03811], and Japan Society for the Promotion of Science (JSPS) KAKENHI [Grant number 19H 05819] to support this research. DS is thankful to National Institute for Materials Science (NIMS) Japan for providing a NIMS internship program fellowship. The authors acknowledge NIMS TEM station for supporting TEM studies. The authors would like to thank Mr. Ilyes Tayeb-Bey (Institut National des Sciences Applique?es de Lyon, France) for assistance in the corrosion testing.
Funding Information:
The authors would like to acknowledge Science and Engineering Research Board ( SERB ) [Grant number EMR/2017/001196 ], Swedish Research Council [Vetenskapsrådet: Grant number 2016/03811 ], and Japan Society for the Promotion of Science ( JSPS ) KAKENHI [Grant number 19H 05819 ] to support this research. DS is thankful to National Institute for Materials Science ( NIMS ) Japan for providing a NIMS internship program fellowship. The authors acknowledge NIMS TEM station for supporting TEM studies. The authors would like to thank Mr. Ilyes Tayeb-Bey (Institut National des Sciences Appliquées de Lyon, France) for assistance in the corrosion testing.
Publisher Copyright:
© 2021 Elsevier B.V.
Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.
Subject classification (UKÄ)
- Metallurgy and Metallic Materials
Free keywords
- AZ91D
- Corrosion
- Double twinning
- Isothermal calorimetry
- SMAT
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- 2 Finished
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Topological control of microstructures for advanced material engineering
Orlov, D. (PI)
2017/10/01 → 2021/12/31
Project: Research
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Topologically designed magnesium alloys for biomedical applications
Orlov, D. (PI), Valant, M. (Researcher), Gardonio, S. (Researcher), Fanetti, M. (Researcher) & Zehetbauer, M. (CoI)
2017/03/01 → 2020/02/29
Project: Research