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Effect of High Deformation without Preheating on Microstructure and Corrosion of Pure Mg

Authors :
Anna Dobkowska
Bogusława Adamczyk-Cieślak
Marlene Aydee Gonzalez Garcia
Wiktor Bednarczyk
Jenő Gubicza
Péter Jenei
Kamilla Mukhtarova
Marek Tkocz
Dariusz Kuc
Jarosław Mizera
Source :
Metals, Vol 14, Iss 8, p 949 (2024)
Publication Year :
2024
Publisher :
MDPI AG, 2024.

Abstract

In this study, the relationship between the extrusion ratio and the corrosion resistance of pure Mg deformed using extrusion with an oscillating die (KoBo) without preheating of the initial billet was investigated. The materials investigated in this study were extruded at high deformation ratios, R1 5:1, R2 7:1, and R3 10:1, resulting in significant grain refinement from the very coarse grains formed in the initial billet to a few µm in the KoBo-extruded samples at room temperature, which is not typical for hexagonal structures. Our research clearly shows that KoBo extrusion improves the corrosion performance of pure Mg, but there is no straightforward dependence between the extrusion ratios and corrosion resistance improvement. Although it was expected that the smallest grain size should provide the highest corrosion resistance, the dislocation density accumulated in the grain interiors during deformation at the highest extrusion ratio, R3 10:1, supports dissolution reactions. This, in turn, provides the answers for the greater grain size observed after deformation at R2 7:1, where dynamic recovery prevailed over dynamic recrystallization. This situation led to the annihilation of dislocation, leading to better corrosion resistance of the respective alloy. Therefore, the alloy with the greatest grain size has the best corrosion resistance.

Details

Language :
English
ISSN :
20754701
Volume :
14
Issue :
8
Database :
Directory of Open Access Journals
Journal :
Metals
Publication Type :
Academic Journal
Accession number :
edsdoj.f6746bde8da448bb1063f703c31e28d
Document Type :
article
Full Text :
https://doi.org/10.3390/met14080949