Cu-3.2Ni-0.75Si-0.30Zn合金强化相的析出行为分析  

Analysis of Precipitating Behavior of Strengthening Phase in Cu-3.2Ni-0.75Si-0.30Zn Alloy

作　　者：王东锋[1] 汪定江[1] 潘庆军[1] 康布熙[2] 刘平[2] 

机构地区：[1]空军第一航空学院二系,河南信阳464000 [2]河南科技大学材料科学与工程学院,河南洛阳471003

出　　处：《金属热处理》2006年第1期43-45,共3页Heat Treatment of Metals

基　　金：国家自然基金资助项目(50071026)

摘　　要：采用金相组织分析、力学性能和电导率测试研究了Cu-3.2Ni-0.75Si-0.30Zn合金的过饱和固溶体在时效过程中强化相的析出机制.结果表明,在250℃～450℃时效初期,过饱和固溶体按调幅分解的方式进行转变,形成溶质原子的贫集区和富集区;随时效时间的延长,溶质原子富集区出现有序化,形成与基体半共格的强化相（Ni2Si）;继续时效时,强化相不断析出与长大,半共格关系被破坏,最终在表面张力的作用下逐渐球化,电导率和显微硬度上升趋势随之减弱.The precipitation mechanism of strengthening phase in super-saturated solid solution of Cu-3.2Ni-0. 75Si- 0. 30Zn alloy during aging was studied with microstructure, microhardness and electric conductivity. The results show that in the early aging（ at 250 -450℃ ）, super-saturated solid solution will transformed by means of spinodal decomposition. As a result, the solute atoms-poor region and rich region are formed. With the prolongation of aging time, the ordering appeare in solute atoms-rich region, and with matrix semi-coherent the strengthening phase （ Ni2 Si） is formed. If aging continues, and the strengthening phase is precipitating and growing, the semi-coherent relation will be destroyed. In the end, under action of surface tension, strengthening phase will be spheroidized. Meanwhile, the increasing tendency of electric conductivity and microhardness is slowed.

关 键 词：Cu-3.2Ni-0.75Si-0.30Zn合金 时效 调幅分解 显微硬度 电导率 

分 类 号：TG146.1[一般工业技术—材料科学与工程] TG111.5[金属学及工艺—金属材料]