期刊
MATERIALS RESEARCH EXPRESS
卷 8, 期 12, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/2053-1591/ac39c1
关键词
Mg alloy; rare earth; static recrystallization; annealing; grain refinement
资金
- National Natural Science Foundation of China [52075501]
- Hubei Key Laboratory of Advanced Technology for Automotive Components [XDQCKF20211002]
- High Performance Magnesium Alloy XXX Multidirectional Extrusion Forming Technology [JCKY2018408B003]
The study discussed the effect of annealing treatment on the microstructure and hardness of Mg-9Gd-4Y-2Zn-0.5Zr alloy. With increasing annealing temperature, grain abnormally grows. Under the condition of 430 degrees C x 5 h, the recrystallization performance of the alloy is the best.
In this paper, the effect of annealing treatment on the microstructure and hardness of extruded Mg-9Gd-4Y-2Zn-0.5Zr alloy (wt. %) was discussed. The microstructure evolution of the alloy under different annealing conditions was studied by optical microscope (OM), scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD), and the variation of hardness was analyzed. With the increase of annealing temperature, the large deformed grains first break into small recrystallized grains. When the temperature continues to increase, the recrystallized grains grow abnormally with the precipitation of chain phase and the fragmentation of lamellar long-period stacking ordered (LPSO) phase. The alloy does not recrystallize at low temperature, and the recrystallize grains grow abnormally at high temperature. The increase of annealing time will also lead to abnormal growth of recrystallized grains. The texture gradually diffuses from the classical extrusion texture to the extrusion direction (ED). The results show that under the condition of 430 degrees C x 5 h, the recrystallization volume of the alloy is the largest, the recrystallization grain distribution is uniform, and the hardness value is the highest.
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