Influence of calcium on ignition-proof mechanism of AM50 magnesium alloy.
In: Journal of Materials Science, Jg. 57 (2022-04-21), Heft 15, S. 7719-7728
Online
academicJournal
Zugriff:
In order to improve the ignition proof of AM50 magnesium alloy, 1wt% Ca was added to AM50 magnesium alloy to prepare investigated alloy. The ignition temperature, ignition-proof holding time at the predetermined temperature, microstructure of oxide film and thermodynamics of oxide film formation were studied. The results show that after adding 1wt% Ca, the ignition temperature of AM50-1wt%Ca alloy reaches 832 °C, which is 248 °C higher than 584 °C of AM50 magnesium alloy. The holding time of AM50 alloy varies with temperature. The higher the temperature, the shorter the holding time. AM50 magnesium alloy can remain for about 720 s at 525 °C without ignition, while it only remains for about 50 s at 550 °C. The oxide film of AM50 magnesium alloy is mainly loose and porous MgO. The oxide film of AM50-1wt.%Ca alloy is a bilayer oxide film of MgO and CaO and CaO is mainly distributed in the outer layer of the oxide film. When the temperature is lower than 949 °C, the △G of CaO formation is less than that of MgO formation during the oxidation process of AM50-1wt%Ca alloy, MgO formed in the early stage of oxidation can be reduced to [Mg] by [Ca] and the minimum [Ca] content required for the reaction is always less than 1wt%. The dense bilayer oxide film formed on the surface of AM50-1wt%Ca alloy can effectively protect alloy and its oxidation process conforms to the parabola variation law. [ABSTRACT FROM AUTHOR]
Titel: |
Influence of calcium on ignition-proof mechanism of AM50 magnesium alloy.
|
---|---|
Autor/in / Beteiligte Person: | Cai, Huisheng ; Wang, Qudong ; Zhao, Yang ; Peng, Jianguo ; Zhang, Nannan ; Wang, Haichuan ; Suéry, Michel ; Blandin, Jean Jacques |
Link: | |
Zeitschrift: | Journal of Materials Science, Jg. 57 (2022-04-21), Heft 15, S. 7719-7728 |
Veröffentlichung: | 2022 |
Medientyp: | academicJournal |
ISSN: | 0022-2461 (print) |
DOI: | 10.1007/s10853-022-07151-6 |
Schlagwort: |
|
Sonstiges: |
|