YANG Laidong1,2, LI Quan'an1,3, CHEN Xiaoya1,3, YAN Lipeng1,3
1 School of Materials Science and Engineering,Henan Univerisity of Science and Technology, Luoyang 471023, Henan, China 2 College of Mechanical Engineering, Longdong University, Qingyang 745000, Gansu, China 3 Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology, Luoyang 471023, Henan, China
Abstract: As the lightest metal structural material, magnesium alloy has good application prospects, but its strength and plasticity are lower than that of aluminum alloy, which limits the application of magnesium alloy. The alloying is an effective means to improve the strength and promote the microstructures of magnesium alloy. Many magnesium alloy products, such as commercial ZK system and AZ system, which have extended the application of the range of magnesium alloy. However, the strength of the commercial ZK system and AZ system are lower than that of the aluminum alloy, and thermostability is poor. Sm has good solution strengthening and aging hardening for magnesium alloy due to the high solid solubility of Sm in Mg at elevated temperature and it decreases with the decreasing temperature. Addition some alloying elements to the Mg-Sm alloys, such as Gd, Y, Nd, Zn, Al and Ca, could enhance the plasticity and the room temperature and elevated temperature strength of Mg-Sm system alloys. Researchers have conducted a lot of study on the mechanical properties, aging process, aging precipitates, crystallographic characteristics of aging precipitates and mechanical properties of Mg-Sm system alloys. Based on the summary of the research results of Mg-Sm based-alloys, this paper systematically introduces the microstructures and mechanical properties of Mg-Sm-Gd, Mg-Sm-Y, Mg-Sm-Nd, Mg-Sm-Zn, Mg-Sm-Al, and Mg-Sm-Ca system alloys under different heat treatment state and forming process, and summarizes the effect of alloying on the microstructures and mechanical properties of Mg-Sm system alloys, and research progress on aging precipitation of the system alloys. Meanwhile, a few critical scientific problems of the current research are pointed out and future research is prospected.
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