Application of Nanosilicon to the Sintering of Mg-Mg<sub>2</sub>Si Interpenetrating Phases Composite
The new in situ fabrication process for Mg-Mg<sub>2</sub>Si composites composed of interpenetrating metal/intermetallic phases via powder metallurgy was characterized. To obtain the designed composite microstructure, variable nanosilicon ((n)Si) (i.e., 2, 4, and 6 vol.% (n)Si) concentrat...
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MDPI AG
2021-11-01
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| Online Access: | https://www.mdpi.com/1996-1944/14/23/7114 |
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| author | Anita Olszówka-Myalska Hanna Myalska Patryk Wrześniowski Jacek Chrapoński Grzegorz Cios |
| author_facet | Anita Olszówka-Myalska Hanna Myalska Patryk Wrześniowski Jacek Chrapoński Grzegorz Cios |
| author_sort | Anita Olszówka-Myalska |
| collection | DOAJ |
| description | The new in situ fabrication process for Mg-Mg<sub>2</sub>Si composites composed of interpenetrating metal/intermetallic phases via powder metallurgy was characterized. To obtain the designed composite microstructure, variable nanosilicon ((n)Si) (i.e., 2, 4, and 6 vol.% (n)Si) concentrations were mixed with magnesium powders. The mixture was ordered using a sonic method. The powder mixture morphologies were characterized using scanning electron microscopy (SEM), and heating and cooling-induced thermal effects were characterized using differential scanning calorimetry (DSC). Composite sinters were fabricated by hot-pressing the powders under a vacuum of 2.8 Pa. Shifts in the sintering temperature resulted in two observable microstructures: (1) the presence of Mg<sub>2</sub>Si and MgO intermetallic phases in α-Mg (580 °C); and (2) Mg<sub>2</sub>Si intermetallic phases in the α-Mg matrix enriched with bands of refined MgO (640 °C). Materials were characterized by light microscopy (LM) with quantitative metallography, X-ray diffraction (XRD), open porosity measurements, hardness testing, microhardness testing, and nanoindentation. The results revealed that (n)Si in applied sintering conditions ensured the formation of globular and very fine Mg<sub>2</sub>Si particles. The particles bonded with each other to form an intermetallic network. The volume fraction of this network increased with (n)Si concentration but was dependent on sintering temperature. Increasing sintering temperature intensified magnesium vaporization, affecting the composite formation mechanism and increasing the volume fraction of silicide. |
| first_indexed | 2024-03-10T04:50:27Z |
| format | Article |
| id | doaj.art-8149c976cbff469392c480f16d368375 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T04:50:27Z |
| publishDate | 2021-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-8149c976cbff469392c480f16d3683752023-11-23T02:38:34ZengMDPI AGMaterials1996-19442021-11-011423711410.3390/ma14237114Application of Nanosilicon to the Sintering of Mg-Mg<sub>2</sub>Si Interpenetrating Phases CompositeAnita Olszówka-Myalska0Hanna Myalska1Patryk Wrześniowski2Jacek Chrapoński3Grzegorz Cios4Faculty of Materials Engineering, Silesian University of Technology, Krasińskiego 8 Street, 40-019 Katowice, PolandFaculty of Materials Engineering, Silesian University of Technology, Krasińskiego 8 Street, 40-019 Katowice, PolandFaculty of Materials Engineering, Silesian University of Technology, Krasińskiego 8 Street, 40-019 Katowice, PolandFaculty of Materials Engineering, Silesian University of Technology, Krasińskiego 8 Street, 40-019 Katowice, PolandAcademic Centre for Materials and Nanotechnology, AGH University of Science and Technology, Al. A. Mickiewicza 30, 30-059 Kraków, PolandThe new in situ fabrication process for Mg-Mg<sub>2</sub>Si composites composed of interpenetrating metal/intermetallic phases via powder metallurgy was characterized. To obtain the designed composite microstructure, variable nanosilicon ((n)Si) (i.e., 2, 4, and 6 vol.% (n)Si) concentrations were mixed with magnesium powders. The mixture was ordered using a sonic method. The powder mixture morphologies were characterized using scanning electron microscopy (SEM), and heating and cooling-induced thermal effects were characterized using differential scanning calorimetry (DSC). Composite sinters were fabricated by hot-pressing the powders under a vacuum of 2.8 Pa. Shifts in the sintering temperature resulted in two observable microstructures: (1) the presence of Mg<sub>2</sub>Si and MgO intermetallic phases in α-Mg (580 °C); and (2) Mg<sub>2</sub>Si intermetallic phases in the α-Mg matrix enriched with bands of refined MgO (640 °C). Materials were characterized by light microscopy (LM) with quantitative metallography, X-ray diffraction (XRD), open porosity measurements, hardness testing, microhardness testing, and nanoindentation. The results revealed that (n)Si in applied sintering conditions ensured the formation of globular and very fine Mg<sub>2</sub>Si particles. The particles bonded with each other to form an intermetallic network. The volume fraction of this network increased with (n)Si concentration but was dependent on sintering temperature. Increasing sintering temperature intensified magnesium vaporization, affecting the composite formation mechanism and increasing the volume fraction of silicide.https://www.mdpi.com/1996-1944/14/23/7114nanosized SiMg<sub>2</sub>Simagnesium matrix compositein situ compositeinterpenetrating phases composite |
| spellingShingle | Anita Olszówka-Myalska Hanna Myalska Patryk Wrześniowski Jacek Chrapoński Grzegorz Cios Application of Nanosilicon to the Sintering of Mg-Mg<sub>2</sub>Si Interpenetrating Phases Composite Materials nanosized Si Mg<sub>2</sub>Si magnesium matrix composite in situ composite interpenetrating phases composite |
| title | Application of Nanosilicon to the Sintering of Mg-Mg<sub>2</sub>Si Interpenetrating Phases Composite |
| title_full | Application of Nanosilicon to the Sintering of Mg-Mg<sub>2</sub>Si Interpenetrating Phases Composite |
| title_fullStr | Application of Nanosilicon to the Sintering of Mg-Mg<sub>2</sub>Si Interpenetrating Phases Composite |
| title_full_unstemmed | Application of Nanosilicon to the Sintering of Mg-Mg<sub>2</sub>Si Interpenetrating Phases Composite |
| title_short | Application of Nanosilicon to the Sintering of Mg-Mg<sub>2</sub>Si Interpenetrating Phases Composite |
| title_sort | application of nanosilicon to the sintering of mg mg sub 2 sub si interpenetrating phases composite |
| topic | nanosized Si Mg<sub>2</sub>Si magnesium matrix composite in situ composite interpenetrating phases composite |
| url | https://www.mdpi.com/1996-1944/14/23/7114 |
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