Experiments have proved the influence of cerium on the microstructure of the tin-phosphor bronze QSn7-0.2 alloy that has been cast, homogenized and recrystallized. The mesh becomes finer, and the grain structure is obviously refined after deformation annealing. Adding a small amount of rare earth cerium can purify the harmful impurities in the alloy or eliminate its harmful effect, and can be mixed with copper to form CuCeP intermetallic compounds, which are dispersed in grain boundaries or grains. These second phases, which are distributed in small black spots, refine the alloy structure, and the addition of cerium significantly improves the strength and hardness of the alloy, and it is determined that the optimum addition amount of cerium in forest tin bronze is 0.1%-0.15% , which effectively improves the comprehensive performance of the forest tin bronze alloy, and sings the service life of the copper alloy material.
Ingot hardness of tin phosphor bronze and the relationship between tensile strength and elongation of sheet specimens and cerium content. The strength and hardness of tin phosphor bronze will increase with the increase of the cerium content of the product, but when the cerium content exceeds 0.125%, the strength and hardness of the product will not increase significantly; the elongation increases with the cerium content. The increase in volume decreased slightly. Considering improving the mechanical properties of the alloy, the optimum cerium content of tin phosphor bronze is 0.1%-0.15%. If the cerium content is too high, the plasticity of the alloy will decrease too much; if the cerium content is too low, the strengthening effect of rare earth elements on the alloy will not be significant.
Post time: May-26-2022