期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 763, 期 -, 页码 120-133出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.05.308
关键词
Magnesium alloy; Transmission electron microscopy (TEM); Ce addition; Microstructure; Mechanical properties; Precipitate
资金
- National Key Technologies RD Program [2015DFH50210, 201602011004GX, 2016SYHZ0006, 20170414001GH]
- National Natural Science Foundation of China [21521092, 51701200]
- Project for Science & Technology Development of Jilin Province [20180520004JH]
Effects of 0.5 wt% cerium (Ce) addition on microstructures and mechanical properties of a wrought Mg-8Gd-1.2Zn-0.5Zr alloy were thoroughly investigated in this work. The results indicate that 0.5 wt% Ce addition has slight refinement on the as-cast grains and results in a lattice expansion of the dominant intermetallic phase Mg3RE. After extrusion, 0.5 wt% Ce addition leads to higher level of recrystallization and finer dynamic recrystallization (DRX) grains and non-recrystallization stripes. In addition, there are much more dynamic precipitates on the DRX grain boundaries in the alloy with Ce addition, and the crystal structure (Mg12RE) is different from those (Mg5Gd) in the alloy with free Ce addition. Under peakaging condition, 0.5 wt% Ce addition significantly changes the precipitates in the DRX grains from basal gamma' phase to prismatic beta' phase. As a result, the as-extruded Mg-8Gd-1.2Zn-0.5Zr alloy with 0.5 wt% Ce addition owns higher strength and more obvious precipitation hardening response than the alloy with free Ce addition. (C) 2018 Elsevier B.V. All rights reserved.
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