Analysis of the Crystallization Kinetics and Thermal Stability of the Amorphous Mg<sub>72</sub>Zn<sub>24</sub>Ca<sub>4</sub> Alloy
The aim of this study was to analyze the crystallization of the Mg<sub>72</sub>Zn<sub>24</sub>Ca<sub>4</sub> metallic glass alloy. The crystallization process of metallic glass Mg<sub>72</sub>Zn<sub>24</sub>Ca<sub>4</sub> was in...
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| Online Access: | https://www.mdpi.com/1996-1944/14/13/3583 |
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| author | Bartosz Opitek Janusz Lelito Michał Szucki Grzegorz Piwowarski Łukasz Gondek Łukasz Rogal |
| author_facet | Bartosz Opitek Janusz Lelito Michał Szucki Grzegorz Piwowarski Łukasz Gondek Łukasz Rogal |
| author_sort | Bartosz Opitek |
| collection | DOAJ |
| description | The aim of this study was to analyze the crystallization of the Mg<sub>72</sub>Zn<sub>24</sub>Ca<sub>4</sub> metallic glass alloy. The crystallization process of metallic glass Mg<sub>72</sub>Zn<sub>24</sub>Ca<sub>4</sub> was investigated by means of the differential scanning calorimetry. The glass-forming ability and crystallization are both strongly dependent on the heating rate. The crystallization kinetics, during the isothermal annealing, were modelled by the Johnson–Mehl–Avrami equation. Avrami exponents were from 2.7 to 3.51, which indicates diffusion-controlled grain growth. Local exponents of the Johnson–Mehl–Avrami equation were also calculated. In addition, the Mg phase—being the isothermal crystallization product—was found, and the diagram of the time–temperature phase transformation was developed. This diagram enables the reading of the start and end times of the crystallization process, occurring in amorphous ribbons of the Mg<sub>72</sub>Zn<sub>24</sub>Ca<sub>4</sub> alloy on the isothermal annealing temperature. The research showed high stability of the amorphous structure of Mg<sub>72</sub>Zn<sub>24</sub>Ca<sub>4</sub> alloy at human body temperature. |
| first_indexed | 2024-03-10T10:01:34Z |
| format | Article |
| id | doaj.art-55fa88829c5c40faae336a157a0c56e3 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T10:01:34Z |
| publishDate | 2021-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-55fa88829c5c40faae336a157a0c56e32023-11-22T01:54:29ZengMDPI AGMaterials1996-19442021-06-011413358310.3390/ma14133583Analysis of the Crystallization Kinetics and Thermal Stability of the Amorphous Mg<sub>72</sub>Zn<sub>24</sub>Ca<sub>4</sub> AlloyBartosz Opitek0Janusz Lelito1Michał Szucki2Grzegorz Piwowarski3Łukasz Gondek4Łukasz Rogal5Faculty of Foundry Engineering, AGH University of Science and Technology, 30 Mickiewicza Street, 30-059 Cracow, PolandFaculty of Foundry Engineering, AGH University of Science and Technology, 30 Mickiewicza Street, 30-059 Cracow, PolandFoundry Institute, Technische Universität Bergakademie Freiberg, 4 Bernhard-von-Cotta-Str., 09599 Freiberg, GermanyFaculty of Foundry Engineering, AGH University of Science and Technology, 30 Mickiewicza Street, 30-059 Cracow, PolandFaculty of Physics and Applied Computer Science, AGH University of Science and Technology, 30 Mickiewicza Street, 30-059 Cracow, PolandInstitute of Metallurgy and Materials Science of Polish Academy of Sciences in Cracow, 25 Reymonta Street, 30-059 Cracow, PolandThe aim of this study was to analyze the crystallization of the Mg<sub>72</sub>Zn<sub>24</sub>Ca<sub>4</sub> metallic glass alloy. The crystallization process of metallic glass Mg<sub>72</sub>Zn<sub>24</sub>Ca<sub>4</sub> was investigated by means of the differential scanning calorimetry. The glass-forming ability and crystallization are both strongly dependent on the heating rate. The crystallization kinetics, during the isothermal annealing, were modelled by the Johnson–Mehl–Avrami equation. Avrami exponents were from 2.7 to 3.51, which indicates diffusion-controlled grain growth. Local exponents of the Johnson–Mehl–Avrami equation were also calculated. In addition, the Mg phase—being the isothermal crystallization product—was found, and the diagram of the time–temperature phase transformation was developed. This diagram enables the reading of the start and end times of the crystallization process, occurring in amorphous ribbons of the Mg<sub>72</sub>Zn<sub>24</sub>Ca<sub>4</sub> alloy on the isothermal annealing temperature. The research showed high stability of the amorphous structure of Mg<sub>72</sub>Zn<sub>24</sub>Ca<sub>4</sub> alloy at human body temperature.https://www.mdpi.com/1996-1944/14/13/3583amorphous MgZnCa alloymetallic glassescrystallization kineticsthermal stability |
| spellingShingle | Bartosz Opitek Janusz Lelito Michał Szucki Grzegorz Piwowarski Łukasz Gondek Łukasz Rogal Analysis of the Crystallization Kinetics and Thermal Stability of the Amorphous Mg<sub>72</sub>Zn<sub>24</sub>Ca<sub>4</sub> Alloy Materials amorphous MgZnCa alloy metallic glasses crystallization kinetics thermal stability |
| title | Analysis of the Crystallization Kinetics and Thermal Stability of the Amorphous Mg<sub>72</sub>Zn<sub>24</sub>Ca<sub>4</sub> Alloy |
| title_full | Analysis of the Crystallization Kinetics and Thermal Stability of the Amorphous Mg<sub>72</sub>Zn<sub>24</sub>Ca<sub>4</sub> Alloy |
| title_fullStr | Analysis of the Crystallization Kinetics and Thermal Stability of the Amorphous Mg<sub>72</sub>Zn<sub>24</sub>Ca<sub>4</sub> Alloy |
| title_full_unstemmed | Analysis of the Crystallization Kinetics and Thermal Stability of the Amorphous Mg<sub>72</sub>Zn<sub>24</sub>Ca<sub>4</sub> Alloy |
| title_short | Analysis of the Crystallization Kinetics and Thermal Stability of the Amorphous Mg<sub>72</sub>Zn<sub>24</sub>Ca<sub>4</sub> Alloy |
| title_sort | analysis of the crystallization kinetics and thermal stability of the amorphous mg sub 72 sub zn sub 24 sub ca sub 4 sub alloy |
| topic | amorphous MgZnCa alloy metallic glasses crystallization kinetics thermal stability |
| url | https://www.mdpi.com/1996-1944/14/13/3583 |
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