By atomic spectrum analysis and metallographic microscope

SEM and other testing equipment

composition

microstructure and property characteristics of the tin phosphor bronze alloy were investigated

and the mechanism and origination of bending breakage of the alloy were analyzed.By adjusting the cold working

intermediate heat treatment

product heat treatment and processing rate

grain size is decreased from 35

6

0μm before adjustment to 10

3

0μm

and the transverse-longitudinal bending performance of the alloy is improved obviously.The results reveal that origination of the Cu-5.6Ni-0.15 Palloy bended breakage is attributed to S segregation as a result of excessive S content and the second phase composed of Cu、Sn、Zn、S distributed along the rolling direction of grain boundary.