The Precipitation and Strengthening Mechanism of Cu-Ni-Si-Co Alloy

摘要：

　　The precipitates,mechanical properties and strengthening effect of Cu-Ni-Si,Cu-Ni-Si- Co0.8 and Cu-Ni-Si-Co1.9 alloys are investigated.It is concluded from the TEM and XRD analysis that the strengthening of Cu-Ni-Si-Co alloy is mainly attributed to precipitates of both Ni2Si and Co2Si phases,with the same structures and very close lattice parameters.The addition of 1.9 wt% Co barely affects the precipitation process of Ni2Si or Co2Si,and may not be beneficial for enhancing the strength.The strengthening of Cu-Ni-Si-Co alloy is determined by the Orowan mechanism,and a critical precipitate radii rc about 1.5 nm corresponding to the peak strength is obtained through the theoretical analysis.It can be deduced that the peak strength of aged Cu-Ni-Si- Co alloy is obtained with the microstructures containing metastable phase and Ni2Si (or Co2Si) precipitates.

关键词： Cu-Ni-Si-Co alloy Precipitation Orowan strengthening

作者: Qiangsong Wang Guoliang Xie XuJun Mi Baiqing Xiong Xiangpeng Xiao

作者单位: General Research Institute for Non-ferrous Metals, State Key Laboratory for Fabrication and Processing of Non-ferrous Metals, Beijing 100088,China

会议类型: 国际会议

会议名称: the Chinese Materials Congress 2012(2012年中国材料大会(CMC2012))

会议地点: 太原

会议语种:英文

页码: 294-298

在线出版日期: 2012-07-13（万方平台首次上网日期，不代表论文的发表时间）