Optimizing microstructure and mechanical properties of biomedical Mg–Y–Zn–Mn alloy with LPSO phases by solution treatment plus equal-channel angular pressing
| Autor: | Yuxuan Yuan, Aibin Ma, Haoran Wu, Zheng Gao, Yaxiao Gu, Jinghua Jiang |
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| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Journal of Materials Research and Technology, Vol 16, Iss , Pp 968-976 (2022) |
| Druh dokumentu: | article |
| ISSN: | 2238-7854 33753075 |
| DOI: | 10.1016/j.jmrt.2021.12.047 |
| Popis: | Long-period stacked ordered (LPSO) Mg–Y–Zn alloys have shown great medical prospects. To explore the impact of LPSO phase evolution on mechanical properties, a new biomedical Mg-2.2Y-1.1Zn-0.4Mn (wt.%) alloy prepared by solution treatment plus equal-channel angular pressing (ECAP) was systematically investigated. The results indicate that massive 18R LPSO networks along α-Mg grain boundaries are disintegrated during solution treatment of the as-cast alloy, whereas 14H lamellas are precipitated in α-Mg grains. Following a similar dispersion of 14H precipitated phases, the remnant 18R network phase was gradually extended, broken, and refined throughout the subsequent multi-pass ECAP process. The refined LPSO phases promote dynamic recrystallization (DRX) during the severe deformation process and improve mechanical properties of the obtained fine-grained alloy. After 773K solution treatment for 10h plus 693K ECAP for 12 passes, the biomedical alloy with co-existing 18R and 14H LSPO phases shows excellent mechanical properties with an ultimate tensile strength of 326.6 MPa and elongation of 14.5 percent. |
| Databáze: | Directory of Open Access Journals |
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