Effect of Cerium on Properties of Sn-Phosphor Bronze Alloy

The ingot hardness of tin phosphor bronze and the relationship between the tensile strength and elongation of the plate sample and the content of cerium. The strength and hardness of tin phosphor bronze increase with the increase of cerium content, but the cerium content exceeds
After 0.125%, the strength and hardness basically no longer increase; the elongation decreases slightly with the increase of cerium content. From the perspective of improving the mechanical properties of the alloy, the optimum cerium content of tin phosphor bronze is 0.10%~
0.15%. If the content of cerium is too high, the plasticity of the alloy will drop too much; if the content of cerium is too low, the strengthening effect of rare earth on the alloy will not be significant.
Effect of Cerium on Second Phase Composition in Alloys
Industrial copper often contains impurities such as oxygen, sulfur, lead, and bismuth. The chemical activity of rare earth cerium is high. After adding copper liquid, it can quickly generate low-density, high-melting rare-earth oxides and sulfides that are easy to float, and remove such impurities from the liquid. Purify. Cerium also forms high-melting point intermetallic compounds with impurity elements such as lead and bismuth in copper, such as PbCe, BiCe, etc., thereby eliminating the harmful effect of such impurities on crystals to precipitate low-melting point phases. Cerium also forms CeCu2, CeCu5, CeCu6 and other intermetallic compounds dispersed in grain boundaries or within grains with copper.