期刊
MATERIALS CHARACTERIZATION
卷 171, 期 -, 页码 -出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2020.110831
关键词
Semisolid; Magnesium alloy; Microstructure; Grain size; Coarsening
类别
资金
- National Key Research and Development Program of China [2016YFB0701201]
- National Natural Science Foundation of China [51971130, 51771113, 51821001]
By using the strain-induced melt activation (SIMA) route, semisolid billets of Mg-10Gd-3Y-1Zn-0.4Zr (wt%) alloy were prepared, and the effects of isothermal heating parameters on the morphology and coarsening kinetics of primary solid grains were studied. The study found that the grain size increased with isothermal time, and the coarsening rate constant increased with isothermal temperature within a certain range.
The semisolid billets of Mg-10Gd-3Y-1Zn-0.4Zr (wt%) alloy were prepared by the strain-induced melt activation (SIMA) route, and the effects of isothermal heating parameters on the morphology and coarsening kinetics of primary solid grains were studied. It was found that the average grain size increased with the increase of isothermal time while the grain size showed different changing laws with the temperature at different isothermal times. The growth behavior of the primary solid grains was predominantly governed by the Ostwald ripening mechanism, although there is coalescence mechanism in some cases. As the isothermal temperature increased from 550 degrees C to 590 degrees C, the coarsening rate constant increased continuously and then declined when the temperature was further increased to 610 degrees C. Compared with other SIMA processed magnesium alloys, the present alloy showed a significantly lower grain coarsening rate constant due to the inhibiting effect of rare earth (RE) elements on coarsening. This research has provided an insight into the microstructural evolution of Mg-RE alloy under different heating conditions, and will provide valuable information for potential industrial applications.
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