固液混合铸造ZA12合金的组织研究  

Microstructure of ZA12 Alloy Prepared by Mixed Solid-Liquid Casting

作　　者：张福全[1] 李晓芳[1] 崔宏涛[1] 陈振华[1] 

机构地区：[1]湖南大学材料科学与工程学院,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2008年第4期66-70,共5页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(50274037)

摘　　要：采用固液混合铸造技术制备ZA12合金，研究合金熔体过热度、粉末加入量和粉末粒度等工艺参数对固液混合铸造ZA12合金组织的影响，并与金属型铸造、半固态铸造组织进行对比研究．结果表明：固液混合铸造组织相对金属型铸造铸态组织与半固态组织，枝晶完全破碎，初生相组织明显细化并偏向于团球状，且分布较为均匀；工艺参数对合金组织有很大影响，在过热度为40℃，粉末加入比例为0．3，粉末粒度为200-400目（38～74）条件下，合金的组织细小、分布均匀，初生相含量也较低；3种工艺制备的ZA12合金的组织都是由η-Zn相、β-AlZn相及少量α-Al相组成．ZA12 alloys were mainly prepared by mixed solid-liquid casting. The effect of different processing parameters and technologies on microstructure have been studied. The results show that the alloys have obviously fine and homogeneous no-dendritic primary phases, compared with those prepared by metal mold casting and semi-solid casting. But they are all composed of η-Zn phase, β-AlZn phase and a small quality of α-Al phase. The relative homogeneous and fine nodular primary phases could be obtained with 40 ℃ degree of superheat, 0.3 mass ratio of the added power and 38-74 of powder particle size.

关 键 词：锌合金 固液混合铸造 微观组织 物相分析 

分 类 号：TD862.3[矿业工程—金属矿开采]