Abstract
AZ80, AZX801, and AZX802 alloys were prepared to investigate the ignition temperature and multi-stage oxidation behavior in air. Besides, the microstructures of alloys before and after oxidation were compared. The results reveal that AZX802 exhibits the characteristics of higher ignition temperature and best oxidation resistance compared to AZX801 and AZ80, which contributes to the increase of melting temperature of secondary phase in matrix due to the formation and increase of Al2Ca, with the addition of Ca in AZ80. In addition, the incubation periods before accelerated oxidation and the beginning of the accelerated oxidation temperatures of AZ80, AZX801, and AZX802 are different during multi-stage oxidation, which also contributes to the different onset melting temperature of the secondary phase. And the beginning of the accelerated oxidation of Mg alloys at high temperature is always accompanied by the onset melting of the low melting temperature of the secondary phase and the growth of oxide nodule on the surface.
Highlights
As the lightest of structural materials, magnesium (Mg) alloys have increased interest in the aerospace and automotive industries thanks to their characteristics of high specific strength and stiffness, low density, and high rigidity [1,2,3,4]
The ignition temperature and oxidation resistance of Ca adding magnesium alloys at elevated temperatures have been researched by some scholars, the multi-stage oxidation behavior of AZ80 alloying with Ca has not been studied by researchers
The AZ80 and AZX801 accelerated oxidation stages of the AZX802 alloy begin at a temperature of about 510 ◦ C, while the oxidation rate is lowest compared with AZ80 and AZX801
Summary
As the lightest of structural materials, magnesium (Mg) alloys have increased interest in the aerospace and automotive industries thanks to their characteristics of high specific strength and stiffness, low density, and high rigidity [1,2,3,4]. Our equipment provides sample operation, accurate temperature monitoring, and air convection to acquire the ignition temperature of samples. The ignition temperature and oxidation resistance of Ca adding magnesium alloys at elevated temperatures have been researched by some scholars, the multi-stage oxidation behavior of AZ80 alloying with Ca has not been studied by researchers. Devices providing sample operation, accurate temperature monitoring, and air convection were adopted to acquire the ignition temperatures of samples. The influence of calcium additions on ignition temperature and multi-stage oxidation behavior of AZ80 were studied, and the melting point of secondary phase of alloys were investigated
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