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An investigation of second phases in as-cast AZ31 magnesium alloys with different Sr contents |
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| Authors: | Lu Wu Fusheng Pan Mingbo Yang Renju Cheng |
| Affiliation: | 1. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, 400045, People’s Republic of China 3. Materials Science & Engineering College, Chongqing University of Technology, Chongqing, 400054, People’s Republic of China 2. Chongqing Academy of Science and Technology, Chongqing, 401123, People’s Republic of China |
| Abstract: | Second phases in the AZ31 as-cast magnesium alloys with different Sr contents (0, 0.1, 0.5, 1.0, 2.0, and 5.0 wt%) were investigated using scanning electron microscopy, energy dispersive spectrometry, differential scanning calorimetry, X-ray diffraction, and transmission electron microscopy. The results indicated that the Mg21(Zn, Al)17 phase with small amount was formed in the AZ31 as-cast alloy without Sr addition, in addition to the Mg17Al12 phase. At the same time, the alloy with the addition of 0.1 wt% Sr mainly consisted of the α-Mg, Mg17Al12, Mg21(Zn, Al)17, and Al4Sr phases. In addition, the α-Mg, Mg21(Zn, Al)17 and Al4Sr phases were found to be the main second phases for the alloy with the addition of 0.5 wt% Sr. However, only the α-Mg, Al4Sr and (Mg, Al)17Sr2 phases were mainly formed in the AZ31 alloy with the addition of 1.0 wt% Sr. As for the alloys with the additions of 2 and 5 wt% Sr, their as-cast microstructures were mainly composed of the α-Mg and (Mg, Al)17Sr2 phases. |
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