期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2019.138292
关键词
Mg-Gd alloy; Mn content; Microstructure; Mechanical properties; Corrosion resistance
类别
资金
- National Key Research and Development Program of China [2016YFB0301102]
- Fundamental Research Funds for the Central Universities [2018CDGFCL0005]
- Postgraduate Education Fund of Chongqing University [201704020]
Effect of various Mn content (0, 0.5, 1.3, 1.5 2.0 wt%) on microstructure and mechanical properties were systematically investigated. The 0.5 wt% Mn addition results in complete recrystallization of as-extruded Mg-2Gd alloy, thus providing the best ductility comparable to other alloys. In the as-extruded Mg-2Gd-0.5Mn alloy, the majority of grains have a soft orientation, which is advantageous for starting basal slip and reducing the yield asymmetry. When the content of Mn exceeds 1.3 wt%, Mn takes effect in refining the grain size of as-extruded alloys but increases the proportion of unrecrystallization microstructure. With the addition of Mn, the strength of as-extruded alloys increases gradually while the ductility deteriorates. The main reasons for the strength increase are attributed to the combination of fine-grained strengthening, precipitation strengthening and texture strengthening. Besides, the addition of Mn enhances the corrosion resistance of as-extruded Mg-Gd alloys system because Mn removes harmful impurities.
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