摘要
The Cu-24 Pb-x Sn(wt%)(x=0,2,4,6)alloys with Pb-rich second-phase particles(SPPs)in different shapes show obviously differently mechanical and self-lubricating properties.The influence of the SPPs’shape difference on the alloys’mechanical and self-lubricating properties was revealed.Cu-24 Pb alloy with continuously netty SPPs shows much more intensive stick-slip phenomenon during dry sliding than the other three alloys with independently rodlike SPPs.That is mainly due to insufficient lubrication resulted by the netty SPPs’splitting matrix.With the SPPs transforming from netty to rodlike shape under the addition of Sn,the stick-slip phenomenon was notably weakened,which was proven to be related to the higher self-lubricating property of alloys with rodlike SPPs.Simultaneously,the simultaneous increase of ductility and tensile strength was observed in the Cu-24 Pb-x Sn alloys with increasing Sn content,which is because the netty SPPs’splitting behavior will be weakened with them replaced by the rodlike SPPs.
The Cu-24 Pb-x Sn(wt%)(x = 0, 2, 4, 6) alloys with Pb-rich second-phase particles(SPPs) in different shapes show obviously differently mechanical and self-lubricating properties. The influence of the SPPs’ shape difference on the alloys’ mechanical and self-lubricating properties was revealed. Cu-24 Pb alloy with continuously netty SPPs shows much more intensive stick-slip phenomenon during dry sliding than the other three alloys with independently rodlike SPPs. That is mainly due to insufficient lubrication resulted by the netty SPPs’ splitting matrix. With the SPPs transforming from netty to rodlike shape under the addition of Sn, the stick-slip phenomenon was notably weakened, which was proven to be related to the higher self-lubricating property of alloys with rodlike SPPs. Simultaneously, the simultaneous increase of ductility and tensile strength was observed in the Cu-24 Pb-x Sn alloys with increasing Sn content, which is because the netty SPPs’ splitting behavior will be weakened with them replaced by the rodlike SPPs.
基金
supported financially by the National Key Research and Development Program of China(Nos.2016YFB0301303 and 2017YFB0306105)
the National Natural Science Foundation of China(Nos.51871041,51771040and51690163)
the Fundamental Research Funds for the Central Universities of China(No.DUT17JC44).
