Mechanical properties and microstructure of powder metallurgy Cu-15Ni-8Sn-0.3Nb alloy
In present study, a Cu-15Ni-8Sn-0.3Nb alloy was produced by means of powder metallurgy (P/M).The influence of Nb on optimizing mechanical properties of Cu-15Ni-8Sn was investigated.Results show that Cu-15Ni-8Sn-0.3Nb alloy exhibited a stable high strength plateau with favored combination of higher ultimate tensile strength (>1030MPa) and better tensile ductility (>9%)upon aging for 0.5~1.25h (peak aged condition).Elemental maps extracted through scanning transmission electron microscope (STEM) and electron probe micro analysis (EPMA)characterizations shown that Nb were localized at intragranlular and grain boundary γ (DO3)precipitates.The mechanism of Nb on improving aging properties of Cu-15Ni-8Sn alloy were discussed.It is found that Nb were localized at phases within grains and along grain boundaries.Such distribution resulted in the inhibition of both grain coarsening and the growth of discontinuous γprecipitates and is beneficial in avoiding grain boundary embrittlement.The inhibition led to the high strength plateau stable with aging time and the improvement in ductility.
Yi Ouyang Shizhong Zhang Xueping Gan Zhiyou Li Kechao Zhou
State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083,P.R.China
国内会议
南昌
英文
54-55
2016-06-29（万方平台首次上网日期，不代表论文的发表时间）