Effect of Mn Element Addition on the Microstructure, Mechanical Properties, and Corrosion Properties of Mg-3Zn-0.2Ca Alloy
Magnesium-zinc-calcium alloys have unique advantages of being used as biomedical bone implants since their mechanical properties and biocompatibility are similar to human tissues. However, insufficient strength and poor corrosion resistance have been the major problems to stunt the application. In t...
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Frontiers Media S.A.
2019-12-01
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| Series: | Frontiers in Materials |
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| Online Access: | https://www.frontiersin.org/article/10.3389/fmats.2019.00324/full |
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| author | Yu Yan Han Chen You Chen You Yun Zhao Yun Zhao Yun Zhao Min Fang Chen Min Fang Chen Min Fang Chen Liang Wang |
| author_facet | Yu Yan Han Chen You Chen You Yun Zhao Yun Zhao Yun Zhao Min Fang Chen Min Fang Chen Min Fang Chen Liang Wang |
| author_sort | Yu Yan Han |
| collection | DOAJ |
| description | Magnesium-zinc-calcium alloys have unique advantages of being used as biomedical bone implants since their mechanical properties and biocompatibility are similar to human tissues. However, insufficient strength and poor corrosion resistance have been the major problems to stunt the application. In this paper, the changes of microstructure, mechanical properties and corrosion resistance of ternary Mg-3Zn-0.2Ca (wt.%) with different contents of Mn (0.3, 0.5, 0.7, 0.9, wt.%) are studied. With the increase of Mn content, the grain size of as-cast alloy first decreases and then increases, this indicates that the amount of Mn affects the degree of subcooling of the alloy. At the 320°C/24 h homogenizing treatment, the large and uneven dendrites are transformed into uniform equiaxed grains, the mechanical properties of alloys with different Mn contents are different on the basis of Mg-3Zn-0.2Ca (wt.%) alloy. The five alloys were extruded into bar with a diameter of 8 mm through hot-extrusion process. Quaternary Mg-3Zn-0.2Ca-XMn (X = 0.3, 0.5, 0.7, 0.9) (wt.%) alloys are investigated and the results show that 0.5 wt.% Mn alloy has the best yield tensile strength (YS) (302 MPa) and good ultimate tensile strength (UTS) (327 MPa). The reason is that the different contents of Mn restrain the dynamic recrystallization in extrusion process, which remarkedly reduced the grain size. Moreover, each alloy is investigated by electrochemical measurements at 37°C in a simulated body fluid (SBF). The electrochemical results show that the corrosion potential of Mn-contained alloys are increased compared to ternary Mg-3Zn-0.2Ca (wt.%) alloy, and 0.5 wt.% Mn-contained alloy performs the best result. |
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| last_indexed | 2024-12-12T00:55:16Z |
| publishDate | 2019-12-01 |
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| series | Frontiers in Materials |
| spelling | doaj.art-7bd3dc28e52f42deb27a386839ce6c722022-12-22T00:43:54ZengFrontiers Media S.A.Frontiers in Materials2296-80162019-12-01610.3389/fmats.2019.00324473785Effect of Mn Element Addition on the Microstructure, Mechanical Properties, and Corrosion Properties of Mg-3Zn-0.2Ca AlloyYu Yan Han0Chen You1Chen You2Yun Zhao3Yun Zhao4Yun Zhao5Min Fang Chen6Min Fang Chen7Min Fang Chen8Liang Wang9School of Materials Science and Engineering, Tianjin University of Technology, Tianjin, ChinaSchool of Materials Science and Engineering, Tianjin University of Technology, Tianjin, ChinaKey Laboratory of Display Materials and Photoelectric Device, Ministry of Education, Tianjin, ChinaSchool of Materials Science and Engineering, Tianjin University of Technology, Tianjin, ChinaKey Laboratory of Display Materials and Photoelectric Device, Ministry of Education, Tianjin, ChinaTianjin Key Laboratory for Photoelectric Materials and Devices, Tianjin, ChinaSchool of Materials Science and Engineering, Tianjin University of Technology, Tianjin, ChinaKey Laboratory of Display Materials and Photoelectric Device, Ministry of Education, Tianjin, ChinaTianjin Key Laboratory for Photoelectric Materials and Devices, Tianjin, ChinaSchool of Materials Science and Engineering, Tianjin University of Technology, Tianjin, ChinaMagnesium-zinc-calcium alloys have unique advantages of being used as biomedical bone implants since their mechanical properties and biocompatibility are similar to human tissues. However, insufficient strength and poor corrosion resistance have been the major problems to stunt the application. In this paper, the changes of microstructure, mechanical properties and corrosion resistance of ternary Mg-3Zn-0.2Ca (wt.%) with different contents of Mn (0.3, 0.5, 0.7, 0.9, wt.%) are studied. With the increase of Mn content, the grain size of as-cast alloy first decreases and then increases, this indicates that the amount of Mn affects the degree of subcooling of the alloy. At the 320°C/24 h homogenizing treatment, the large and uneven dendrites are transformed into uniform equiaxed grains, the mechanical properties of alloys with different Mn contents are different on the basis of Mg-3Zn-0.2Ca (wt.%) alloy. The five alloys were extruded into bar with a diameter of 8 mm through hot-extrusion process. Quaternary Mg-3Zn-0.2Ca-XMn (X = 0.3, 0.5, 0.7, 0.9) (wt.%) alloys are investigated and the results show that 0.5 wt.% Mn alloy has the best yield tensile strength (YS) (302 MPa) and good ultimate tensile strength (UTS) (327 MPa). The reason is that the different contents of Mn restrain the dynamic recrystallization in extrusion process, which remarkedly reduced the grain size. Moreover, each alloy is investigated by electrochemical measurements at 37°C in a simulated body fluid (SBF). The electrochemical results show that the corrosion potential of Mn-contained alloys are increased compared to ternary Mg-3Zn-0.2Ca (wt.%) alloy, and 0.5 wt.% Mn-contained alloy performs the best result.https://www.frontiersin.org/article/10.3389/fmats.2019.00324/fullbiomedical magnesium alloysmicrostructuremechanical propertiescorrosion propertiesα-Mn |
| spellingShingle | Yu Yan Han Chen You Chen You Yun Zhao Yun Zhao Yun Zhao Min Fang Chen Min Fang Chen Min Fang Chen Liang Wang Effect of Mn Element Addition on the Microstructure, Mechanical Properties, and Corrosion Properties of Mg-3Zn-0.2Ca Alloy Frontiers in Materials biomedical magnesium alloys microstructure mechanical properties corrosion properties α-Mn |
| title | Effect of Mn Element Addition on the Microstructure, Mechanical Properties, and Corrosion Properties of Mg-3Zn-0.2Ca Alloy |
| title_full | Effect of Mn Element Addition on the Microstructure, Mechanical Properties, and Corrosion Properties of Mg-3Zn-0.2Ca Alloy |
| title_fullStr | Effect of Mn Element Addition on the Microstructure, Mechanical Properties, and Corrosion Properties of Mg-3Zn-0.2Ca Alloy |
| title_full_unstemmed | Effect of Mn Element Addition on the Microstructure, Mechanical Properties, and Corrosion Properties of Mg-3Zn-0.2Ca Alloy |
| title_short | Effect of Mn Element Addition on the Microstructure, Mechanical Properties, and Corrosion Properties of Mg-3Zn-0.2Ca Alloy |
| title_sort | effect of mn element addition on the microstructure mechanical properties and corrosion properties of mg 3zn 0 2ca alloy |
| topic | biomedical magnesium alloys microstructure mechanical properties corrosion properties α-Mn |
| url | https://www.frontiersin.org/article/10.3389/fmats.2019.00324/full |
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