Effect of Alloying Elements on Elevated Temperature Tensile Ductility of Bi-Added, Pb-Free Brass

摘要

In the present study, the effects of P and/or Misch metal (Ms) on the microstructure and high temperature tensile behavior of Bi-added, Pb-free brass were examined. It was found that the tensile utility of Bi-added, Pb-free brass decreased significantly at 300 deg C. The addition of P and/or Ms, on the other hand, greatly improved elevated temperature tensile utility of the present alloy. The microstructural observation demonstrated that the formation of Bi film along the alpha-beta, phase boundary, which is the main cause for the low tensile utility at elevated temperature, was substantially reduced with the addition of P and/or Ms. The retarded Bi film formation was believed to be due to the thermally stable Bi-related compounds formed in Bi-added, Pb-free brass.