Chemical analysis and application of non-ferrous metals and rare earth elements

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Rare earth elements can change the presence of impurities in non-ferrous metals through chemical reactions. There are often metallic or non-metallic impurities in non-ferrous metals, and metal rare earth elements can react with these impurity metals to form different compounds than iron, silicon, etc. This can change the inherent solid solution method of aluminum metal, leading to a continuous decrease in its resistivity. For example, rare earth elements and non-metallic elements generate high melting point compounds through chemical reactions, which refines the grain network structure of non-ferrous metals, effectively stabilizes grain boundaries, and forms high melting point intermetallic compounds, improving the comprehensive performance of non-ferrous metals.
The addition of rare earth elements can reduce the hydrogen content in non-ferrous metals because hydrogen, especially hydrogen integrated into liquid metals, exists in an atomic state and then becomes a polymer, causing cracks and other problems in non-ferrous materials, seriously reducing their overall performance and damaging their processing. Therefore, reducing the hydrogen content in non-ferrous metals is increasingly attracting the attention of scientists. Therefore, adding an appropriate amount of rare earth elements can effectively reduce the hydrogen content. For example, studies have shown that rare earth elements ranging from 0.190 to 0.3% can significantly reduce the hydrogen content in aluminum and its alloys, achieving a very good hydrogen reduction effect. Rare earth elements can change the surface tension of alloys. Research has shown that as long as the surface tension of the matrix is reduced, the formability and castability of metals or alloys can be effectively improved. The formability and castability of metals are one of the effective standards for the performance of metals and their alloys. Numerous literature has shown that adding an appropriate amount of rare earth elements to aluminum and aluminum alloys can effectively reduce surface tension.