热浸镀锌用Zn-Ni合金凝固组织的研究  

Study on the Solidification Microstructure of Zn-Ni Alloys Used in Hot Dip Galvanizing

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研究所,广州510640

出　　处：《材料导报》2005年第F05期385-387,390,共4页Materials Reports

摘　　要：用扫描电镜、电子探针及X射线衍射等分析方法研究了Zn-0.24Ni％Ni、Zn-0．5％Ni及Zn-2％Ni三种热浸镀锌用合金在不同冷却速度下获得的凝固组织特点。结果表明：Zn-0．24％合金炉冷和空冷时的凝固组织为典型的棒状共晶，水冷时为离异共晶，合金相粒子细小且分布均匀；相同冷却速度下，Zn-0．5％Ni和Zn-2％Ni合金中的合金相粒子尺寸相当，但前者凝固组织中的合金相粒子均为8相，而后者主要为γ相粒子且数量更多。冷却速度的提高，有利于不同成分的Zn—Ni合金获得较小的合金相粒子，且分布更均匀。The solidification microstructures of Zn-0. 24% Ni,Zn-0. 5% Ni and Zn-2% Ni alloys at different cooling rates axe investigated by means of SEM ,electron probe and X-ray diffraction analysis. The results show that typical rod-like eutectic is formed under furnace cooling and air cooling and the divorced eutectic is formed under water cooling in Zn-0. 24% Ni alloy. At the same cooling rate,the size of the intermetallic compound particles in Zn-0. 5% Ni alloy is much close to those in Zn-2% Ni alloy. However,the particles in Zn-0. 5%Ni alloy are all 5 phase,while those in Zn-2% Ni alloy are mainly γ phase. The size of the intermetallic compound particles in Zn-Ni alloy become smaller and distribute more uniformly with the increasing of cooling rate.

关 键 词：凝固 热镀锌 ZN-NI合金 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TQ153.2[金属学及工艺—金属材料]