Evolution of gradient structured layer on AZ91D magnesium alloy and its corrosion behaviour

Digvijay Singh, Dudekula A. Basha, Lars Wadsö, Dmytro Orlov, Yoshitaka Matsushita, Alok Singh, Santosh S. Hosmani

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Sammanfattning

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.

Originalspråkengelska
Artikelnummer160659
TidskriftJournal of Alloys and Compounds
Volym882
DOI
StatusPublished - 2021 nov. 15

Bibliografisk information

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.

Ämnesklassifikation (UKÄ)

  • Metallurgi och metalliska material

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