Effect of Single and Co-addition of Rare Earth on the Microstructure, Mechanical Properties, and Corrosion Behavior of AZ31 Magnesium Alloys

In this work, AZ31 and AZ31-1 wt.% RE (RE = Nd, Dy, Nd+Dy) alloys were prepared by conventional casting. The effect of single and co-addition of rare earth (RE) on the microstructure, mechanical properties and corrosion   behavior of as-cast AZ31 magnesium alloys were investigated at ambient tempera...

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Bibliographic Details
Published in:Journal of materials engineering and performance 2024-10, Vol.33 (19), p.10386-10400
Main Authors: Lwin, May Likha, Shin, Dong-won, Nam, Sun Woo, Go, Yohan, Kim, Young Min, Kim, Taek-Soo, Lee, Ji-Woon, Hong, Soon-Jik
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry and Materials Science
Corrosion and Coatings
Engineering Design
Materials Science
Original Research Article
Quality Control
Reliability
Safety and Risk
Tribology
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Summary:In this work, AZ31 and AZ31-1 wt.% RE (RE = Nd, Dy, Nd+Dy) alloys were prepared by conventional casting. The effect of single and co-addition of rare earth (RE) on the microstructure, mechanical properties and corrosion   behavior of as-cast AZ31 magnesium alloys were investigated at ambient temperature, and after heat treatment at 400 °C for 1 h. The addition of 1 wt.% RE (RE = Nd, Dy, Nd+Dy) preferentially formed the Al 2 RE phase and completely suppressed the formation of the intermetallic β -Mg 17 Al 12 phase. An excellent ultimate tensile strength (UTS)/ductility combination of 209 MPa/21% and 192 MPa/17% with an adequate yield strength (YS) of 90 MPa was observed for AZ31+Nd sample in as-cast and annealed states, respectively. The work-hardening rate of the AZ31 alloy containing Nd and Dy increased significantly after annealing compared to those of the as-cast state. Fracture analysis indicated that the additive RE did not obviously change the fracture mechanism of the Mg alloy. All specimens exhibit a hybrid fracture with cleavages and dimples. The weight loss test showed that the corrosion resistance of the AZ31 Mg alloy was improved with added RE as it interacts with Al to form Al-RE phase, which upgraded the corrosion resistance of the alloys. The co-addition of RE (RE = Nd+Dy) was proven to enhance corrosion resistance, and also stabilized the corrosion rate. In brief,  the co-addition of Nd and Dy significantly improved the corrosion resistance of the AZ31 magnesium alloys than the counterpart of the mechanical properties. Graphical Abstract
ISSN:1059-9495
1544-1024
DOI:10.1007/s11665-023-08674-y