Effects of holding temperature and time on semi-solid isothermal heat-treated microstructure of ZA84 magnesium alloy |
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Authors: | YANG Ming-bo PAN Fu-sheng CHENG Ren-ju SHEN Jia |
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Affiliation: | [1]College of Materials Science and Engineering, Chongqing Institute of Technology, Chongqing 400050, China [2]College of Materials Science and Engineering, Chongqing University, Chongqing 400030, China |
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Abstract: | The feasibility of fabricating ZA84 magnesium alloy with non-dendritic microstructure by a semi-solid isothermal heat treatment process and the effects of holding temperature and time on the semi-solid isothermal heat-treated microstructure of the alloy were investigated. The results indicate that it is possible to produce ZA84 alloy with non-dendritic microstructure by suitable semi-solid isothermal heat treatment. After being treated at 560-575℃ for 120min, ZA84 magnesium alloy can obtain a non-dendritic microstructure with 14.2%-25.6% liquid fraction and an average size of 56-65μm of the unmelted primary solid particles. With the increasing holding time from 30 to 120min or holding temperature from 560 to 575℃, the average size of unmelted primary solid particles decreases and globular tendency becomes more obvious. Under the experimental condition, the microstructural evolution of ZA84 alloy during semi-solid isothermal treatment is mainly composed of three stages of initial coarsening. structulseparation and spheroidization. The subsequent coarsening of spheroidal grains is not observed. |
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Keywords: | ZA84 magnesium alloy semi-solid state isothermal heat treatment |
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