Effect of MgO Contents on the Microstructure, Mechanical Properties and Corrosion Behavior of Low-Alloyed Mg-Zn-Ca Alloy
The effects of different MgO contents (0.3 wt.%, 0.5 wt.%, 0.7 wt.% and 1.0 wt.%) on the microstructure and properties of Mg-1Zn-0.5Ca alloy (ZX) were systematically investigated to promote the clinical application of Mg alloys. The results showed that a MgO addition promoted the precipitates of Ca&...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-02-01
|
| Series: | Metals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4701/14/3/274 |
| _version_ | 1827305558183510016 |
|---|---|
| author | Qian Zhao Shaoyuan Lyu Guopeng Zhang Minfang Chen |
| author_facet | Qian Zhao Shaoyuan Lyu Guopeng Zhang Minfang Chen |
| author_sort | Qian Zhao |
| collection | DOAJ |
| description | The effects of different MgO contents (0.3 wt.%, 0.5 wt.%, 0.7 wt.% and 1.0 wt.%) on the microstructure and properties of Mg-1Zn-0.5Ca alloy (ZX) were systematically investigated to promote the clinical application of Mg alloys. The results showed that a MgO addition promoted the precipitates of Ca<sub>2</sub>Mg<sub>6</sub>Zn<sub>3</sub> and Mg<sub>2</sub>Ca after hot extrusion. Meanwhile, the average grain size of the ZX alloy decreased abruptly from 17.73 μm to 5.54 μm after the addition of 0.3 wt.% MgO and then reduced slowly as further increasing the MgO contents to 1.0 wt.%. The microhardness and yield strength (YS) increased gradually from 59.43 HV and 102.0 MPa in ZX to 69.81 HV and 209.5 MPa in ZX1.0, respectively. However, the elongation to failure (EL) decreased from 26.7% in ZX to 21.2% in ZX1.0 due to the increase of volume fraction of the second phase and decrease of grain size as increasing the MgO. The corrosion result showed that ZX alloy exhibited local corrosion while ZX composites (ZX0.3, ZX0.5 and ZX0.7) displayed relatively uniform corrosion owing to the fine grain size, dispersed fine second and the protective effect of corrosion product after MgO hydrolyzation. However, excessive MgO (ZX1.0) easily caused the aggregation of itself and the precipitates and deteriorated the corrosion resistance of the material. |
| first_indexed | 2024-04-24T18:01:15Z |
| format | Article |
| id | doaj.art-24c8432cfb7f45aaa39b3a15c091ad02 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-04-24T18:01:15Z |
| publishDate | 2024-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-24c8432cfb7f45aaa39b3a15c091ad022024-03-27T13:54:17ZengMDPI AGMetals2075-47012024-02-0114327410.3390/met14030274Effect of MgO Contents on the Microstructure, Mechanical Properties and Corrosion Behavior of Low-Alloyed Mg-Zn-Ca AlloyQian Zhao0Shaoyuan Lyu1Guopeng Zhang2Minfang Chen3School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, ChinaSchool of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, ChinaSchool of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, ChinaKey Laboratory of Display Materials and Photoelectric Device (Ministry of Education), Tianjin 300384, ChinaThe effects of different MgO contents (0.3 wt.%, 0.5 wt.%, 0.7 wt.% and 1.0 wt.%) on the microstructure and properties of Mg-1Zn-0.5Ca alloy (ZX) were systematically investigated to promote the clinical application of Mg alloys. The results showed that a MgO addition promoted the precipitates of Ca<sub>2</sub>Mg<sub>6</sub>Zn<sub>3</sub> and Mg<sub>2</sub>Ca after hot extrusion. Meanwhile, the average grain size of the ZX alloy decreased abruptly from 17.73 μm to 5.54 μm after the addition of 0.3 wt.% MgO and then reduced slowly as further increasing the MgO contents to 1.0 wt.%. The microhardness and yield strength (YS) increased gradually from 59.43 HV and 102.0 MPa in ZX to 69.81 HV and 209.5 MPa in ZX1.0, respectively. However, the elongation to failure (EL) decreased from 26.7% in ZX to 21.2% in ZX1.0 due to the increase of volume fraction of the second phase and decrease of grain size as increasing the MgO. The corrosion result showed that ZX alloy exhibited local corrosion while ZX composites (ZX0.3, ZX0.5 and ZX0.7) displayed relatively uniform corrosion owing to the fine grain size, dispersed fine second and the protective effect of corrosion product after MgO hydrolyzation. However, excessive MgO (ZX1.0) easily caused the aggregation of itself and the precipitates and deteriorated the corrosion resistance of the material.https://www.mdpi.com/2075-4701/14/3/274Mg-Zn-Ca alloyMgOmechanical propertiescorrosion behavior |
| spellingShingle | Qian Zhao Shaoyuan Lyu Guopeng Zhang Minfang Chen Effect of MgO Contents on the Microstructure, Mechanical Properties and Corrosion Behavior of Low-Alloyed Mg-Zn-Ca Alloy Metals Mg-Zn-Ca alloy MgO mechanical properties corrosion behavior |
| title | Effect of MgO Contents on the Microstructure, Mechanical Properties and Corrosion Behavior of Low-Alloyed Mg-Zn-Ca Alloy |
| title_full | Effect of MgO Contents on the Microstructure, Mechanical Properties and Corrosion Behavior of Low-Alloyed Mg-Zn-Ca Alloy |
| title_fullStr | Effect of MgO Contents on the Microstructure, Mechanical Properties and Corrosion Behavior of Low-Alloyed Mg-Zn-Ca Alloy |
| title_full_unstemmed | Effect of MgO Contents on the Microstructure, Mechanical Properties and Corrosion Behavior of Low-Alloyed Mg-Zn-Ca Alloy |
| title_short | Effect of MgO Contents on the Microstructure, Mechanical Properties and Corrosion Behavior of Low-Alloyed Mg-Zn-Ca Alloy |
| title_sort | effect of mgo contents on the microstructure mechanical properties and corrosion behavior of low alloyed mg zn ca alloy |
| topic | Mg-Zn-Ca alloy MgO mechanical properties corrosion behavior |
| url | https://www.mdpi.com/2075-4701/14/3/274 |
| work_keys_str_mv | AT qianzhao effectofmgocontentsonthemicrostructuremechanicalpropertiesandcorrosionbehavioroflowalloyedmgzncaalloy AT shaoyuanlyu effectofmgocontentsonthemicrostructuremechanicalpropertiesandcorrosionbehavioroflowalloyedmgzncaalloy AT guopengzhang effectofmgocontentsonthemicrostructuremechanicalpropertiesandcorrosionbehavioroflowalloyedmgzncaalloy AT minfangchen effectofmgocontentsonthemicrostructuremechanicalpropertiesandcorrosionbehavioroflowalloyedmgzncaalloy |