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| Effect of Isothermal Heat-treated on the Microstructure of ZA61 Rare Earth Magnesium Alloy |
| DU Lei, YAN Hong |
| Department of Materials Processing Engineering, Nanchang University, Nanchang, 330031 |
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Cite this article:
DU Lei YAN Hong. Effect of Isothermal Heat-treated on the Microstructure of ZA61 Rare Earth Magnesium Alloy. Chin J Mater Res, 2012, 26(2): 169-174.
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Abstract The effect of the isothermal heat-treatment on semi-solid microstructure of AZ61 rare earth alloy were investigated. The results show that with increasing of the isothermal heat-treated temperature, the serious dendritic in the microstructure of initial cast alloy turned into semi-solid non-dendritic tissue after the isothermal heat-treatment. This microstructure evolution includes coarsening, microstructure separation and spheroidizing. In the process of isothermal heat-treatment , the element La is very important to refine alloy’s organization.It hinder aggregating and associating of the particles of solid phase , inhibit further growing of the particles of solid phase and make the microstructure of non-dendritic tissue more smaller. After the isothermal heat-treatment for different time, the irregular large block tissue begin
spheroidizing and form many nearly spherical particles. But when the time of isothermal heat-treatment exceed a certain range, the spherical particles began to coarsen and many liquid islands formed in the particles. The spheroidizing of dendritic microstructure includes the disappearance of secondary dendrite wall and Ostwald ripening process.
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Received: 19 December 2011
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| Fund: Supported by National Nature Science Foundation of China No.51165032, and Financial project of education department of Jiangxi province No.GJJ11269. |
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