Phase Transformation And Solidification Microstructure Of AZ Magnesium Alloy

Magnesium alloys attract more and more attention of the material scientists, due to its abundant of magnesium resource, high strength, stiffness and good casting, damping, cutting properties, dimensional stability, good electromagnetism shield and easy recycled. Mg-Al-Zn magnesium alloy is one of the most useful magnesium alloy. Many researches have being done to the Mg-Al-Zn magnesium alloys, and it achieved many positive productions, however the development of Mg-Al-Zn magnesium alloys is not very perfect enough. At present, it still has no integrated magnesium alloy database system at home and abroad. This paper has done some in-depth researches of phase transformation and solidification of AZ magnesium alloy, it obtained some essential information, such as phase transformation temperature and microstructure during the solidification, and offered some data for establishing magnesium alloy database system. It analyzed the phase change in solidification process of AZ magnesium alloy, with thermal analysis and different cooling curves. The analysis, such as the change of microstructures, phase distribution and characters of the begin phase during the solidification process of AZ61 magnesium alloy, was the emphases in this paper.Different cooling rates were obtained by changing the manner of solidification. It investigated the relationships between dendrite arm spacing, phase transition temperature and the cooling rate, and described their relation curves. With the relation curves, it obtained some experience formula such as: the relationship between beginning solidification temperature and cooling rate y=615.22x-0.0055, the relationship between eutectic temperature and cooling rate y=426.59x-0.0135, and the relationship between dendrite arm spacing and cooling rate y=706.05x-0.3336。...