期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 884, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.161062
关键词
Magnesium alloy; Microstructures; Mechanical properties; Transmission electron microscopy (TEM); Strengthening Mechanisms
资金
- National Natural Science Foundation of China [11804030]
- Scientific and Technological Developing Scheme of Jilin Province [YDZJ202102CXJD012, 20200801048GH, 20200602021ZP]
- Capital Construction Founds of Jilin Province with Innovation Capacity Building [2021C038-1]
- Jilin Province [2021SYHZ0043]
- Chinese Academy of Sciences [2021SYHZ0043]
The study extensively investigated the effects of 0.5 wt% La addition on a traditional hot-extruded Mg-9Gd-3Y-0.5Zr alloy, finding that the addition of minor La significantly improved the mechanical performance of the alloy at room temperature mainly through grain-refinement strengthening mechanism.
Effects of 0.5 wt% La addition on microstructures and mechanical properties of a traditional hot-extruded Mg-9Gd-3Y-0.5Zr alloy were thoroughly investigated in this work. The results indicate that minor La addition obviously improves the alloy's mechanical performance at room temperature, accomplished an ultra-high tensile yield strength of 480 MPa with the elongation of similar to 6%, although leading to much lower high-temperature strength. Microstructural analysis reveals that after extrusion, minor La addition leads to a significantly higher level of recrystallization (the volume fraction is improved from 21% to 68%), much finer dynamically recrystallized (DRXed) grains (the average sizes are refined from 4.12 mu m to 3.26 mu m), and also finer non-recrystallization stripes. La addition promoting recrystallization is mainly attributed to the finer grains and much more intermetallics not only at grain boundaries but also in alpha-Mg grains of the ingots before extrusion. During peak-aging, minor La addition does not change intermetallics/precipitates in both DRXed grains and non-recrystallized regions except some extra coarse Mg17La2 particles mainly in extrusion stringers. Therefore, minor La addition improving both strength and ductility of the hot-extruded Mg-9Gd-3Y-0.5Zr alloy at room temperature is mainly by grain-refinement strengthening which is also the underlying cause for the lower work hardening coefficient, high-temperature strength but higher ductility. (C) 2021 Elsevier B.V. All rights reserved.
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