Zn-2wt%Ni合金包晶凝固的研究  

Study on Peritectic Solidification of Zn-2wt%Ni Alloy

作　　者：孔纲[1] 卢锦堂[1] 许乔瑜[1] 

机构地区：[1]华南理工大学材料科学与工程学院,广东广州510640

出　　处：《金属热处理》2006年第1期36-39,共4页Heat Treatment of Metals

摘　　要：采用扫描电镜、电子探针及X射线衍射等方法研究了Zn-2wt%N i合金在不同冷却方式下的凝固组织特点。结果表明,Zn-2wt%N i合金中的包晶δ相形核困难,生长较缓慢。在炉冷条件下包晶δ相粒子仅局部包裹初生γ相生长;空冷及水冷组织均无法观察到包晶δ相。包晶δ相的生长除了通过包晶反应中的固-固扩散转变的方式进行外,L/γ界面通过包晶反应生长及在L/δ界面从液相中的直接生长也可能起着重要作用。The solidification characteristics of Zn-2wt% Ni alloy under different cooling modes were investigated by SEM,electron probe and X-ray diffraction analysis. The results show that the nuclearation and growth of peritectic phase are rather slow during the solidification of Zn-2wt% Ni alloy. Under furnace cooling the δ phase particles envelopes some areas of the surface of primary γ phase, while no δ phase particle can be observed in the microstructure gained by air-cooling and water-cooling. For the growth of δ phase, apart from the way of the solid-solid diffusion in the peritectic reaction,the L/γ interface through peritectic reaction and direct participation at the L/δ interface may also play an important role.

关 键 词：凝固 包晶 ZN-NI合金 热浸镀锌 

分 类 号：TG146.1[一般工业技术—材料科学与工程] TG113.1[金属学及工艺—金属材料]