Effect of Er Addition and Heat Treatment on Microstructure, Mechanical Properties and Corrosion Behaviors of As-Cast Mg-5Sm-0.2Ni Alloy
- 1Baotou Research Institute of Rare Earths, Baotou 014030, China
Abstract
In this study, the synergistic influence of Er alloying and heat treatment on the as-cast Mg-5Sm-0.2Ni alloy were comprehensively investigated. The results show that Er addition promotes the formation of a Mg(Er,Sm)₃ phase during the solidification process, and subsequent heat treatment alters the morphology, distribution and volume fraction of the Ni-containing LPSO phases, meanwhile promoting the precipitation of noodle-like Mg3Sm phases from an α-Mg matrix. Compared to the as-cast Mg-5Sm-0.2Ni alloy, the yield strength of the Mg-5Sm-1Er-0.2Ni alloy subjected to heat treatment increased from 88 ± 4 MPa to 144 ± 5 MPa, and the corrosion rate decreased from 492.6 ± 14.2 mm/year to 166.2 ± 12.4 mm/year. The enhanced yield strength of the heat-treated Mg-5Sm-1Er-0.2Ni alloy mainly originates from the finely dispersed Mg(Er,Sm)₃ phases and the noodle-like Mg₃Sm precipitates, while the reduced corrosion rate is due to the decreased volume fraction and coarsened size of the LPSO phases, which weaken the galvanic corrosion effect. This study provides a new approach for the preparation of Mg-Sm-Er-Ni alloys with high yield strengths and controlled corrosion rates.
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BibTeX
@article{liu2026effect,
title = {{Effect of Er Addition and Heat Treatment on Microstructure, Mechanical Properties and Corrosion Behaviors of As-Cast Mg-5Sm-0.2Ni Alloy}},
author = {Feng Liu and Wenxin Hu and Wei Wang and He Guo and Hongfei Wu and Wei He and Yuming Lu and Zhenghua Yang},
journal = {Crystals},
year = {2026},
month = sep,
doi = {10.3390/cryst16100615},
url = {https://doi.org/10.3390/cryst16100615},
note = {CC BY},
}
RIS
TY - JOUR
TI - Effect of Er Addition and Heat Treatment on Microstructure, Mechanical Properties and Corrosion Behaviors of As-Cast Mg-5Sm-0.2Ni Alloy
AU - Feng Liu
AU - Wenxin Hu
AU - Wei Wang
AU - He Guo
AU - Hongfei Wu
AU - Wei He
AU - Yuming Lu
AU - Zhenghua Yang
PY - 2026
DA - 2026/09/01
JO - Crystals
DO - 10.3390/cryst16100615
UR - https://doi.org/10.3390/cryst16100615
AB - In this study, the synergistic influence of Er alloying and heat treatment on the as-cast Mg-5Sm-0.2Ni alloy were comprehensively investigated. The results show that Er addition promotes the formation of a Mg(Er,Sm)₃ phase during the solidification process, and subsequent heat treatment alters the morphology, distribution and volume fraction of the Ni-containing LPSO phases, meanwhile promoting the precipitation of noodle-like Mg3Sm phases from an α-Mg matrix. Compared to the as-cast Mg-5Sm-0.2Ni alloy, the yield strength of the Mg-5Sm-1Er-0.2Ni alloy subjected to heat treatment increased from 88 ± 4 MPa to 144 ± 5 MPa, and the corrosion rate decreased from 492.6 ± 14.2 mm/year to 166.2 ± 12.4 mm/year. The enhanced yield strength of the heat-treated Mg-5Sm-1Er-0.2Ni alloy mainly originates from the finely dispersed Mg(Er,Sm)₃ phases and the noodle-like Mg₃Sm precipitates, while the reduced corrosion rate is due to the decreased volume fraction and coarsened size of the LPSO phases, which weaken the galvanic corrosion effect. This study provides a new approach for the preparation of Mg-Sm-Er-Ni alloys with high yield strengths and controlled corrosion rates.
SN - 2073-4352
ER -