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Thesis, experimental and theoretical analysis method of combining , targeted studies containing rare earth elements Mg-6Li-1.5A1 alloy elements and the different Nd content Mg-11 Li-1Al alloy . By optical and scanning electron microscopy , electronic universal tensile , X-ray diffraction analysis, spectrum analysis and other means, discusses Rare Earth Elements on Mg-Li alloy microstructure and properties of regularity and mechanism . The results showed that: ( 1 ) in the Mg-11Li-1Al alloy , by adding a small amount of Nd elements, you can refine the organization , increasing the hardness of the alloy , Nd content of 1.3 %, the refinement of the best, highest hardness . Adding a small amount of Nd is the mechanism refine the organization supercooling effect and produce components generated AI11Nd3 hinder grain growth phase particles . ( 2 ) In the Mg-6Li-1.5Al alloy , by adding 1% of different rare earth , Alloy than Mg-6Li-1.5Al alloy in both refined and Nd, La-rich misch metal is better refinement . Rare earth elements in the alloy mainly formed of Al intermetallic compound is formed by Ce Al2Ce; adding Y formation Al2Y; adding Gd formation AlGd; adding La-rich misch metal formed mainly Al3La; adding Nd formation Al2Nd. Adding rare earth elements , cast alloy tensile strength and elongation is increased. Adding 1% different rare earth elements , can improve processing performance alloy , after deformation processing, the tissue was thinning, can significantly improve the tensile strength , and its strengthening mechanism dominated by grain refinement .
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