罐用铝材铸态组织结构的电镜观察  

Observation of As-cast Microstructure Features of Al Sheet for Can Manufacturing

作　　者：傅高升[1,2] 陈鸿玲[2] 陈文哲[2,3] 钱匡武[2] 

机构地区：[1]福建交通职业技术学院 [2]福州大学 [3]福建工程学院

出　　处：《特种铸造及有色合金》2009年第8期698-702,共5页Special Casting & Nonferrous Alloys

基　　金：福建省自然科学基金资助项目(E0610004;E0210011)

摘　　要：采用SEM、EDAX和TEM及选区电子衍射(SAED)等方法,考察和分析了经不同熔体处理的高成形性压力罐用铝材的铸态微观组织结构特征。结果表明,压力罐用铝材中的氧化夹杂物主要为面心立方晶格的γ-Al2O3,富Fe杂质相主要有单斜晶格的Al3Fe相、六方晶格的T1相(Al12Fe3Si)和AlFeSiRE相,其中AlFeSiRE相的晶体结构较复杂,有待进一步确定。熔体处理对罐用铝材铸态的微观组织结构产生了显著影响。未处理或常规处理时,氧化夹杂物数量较多,且呈聚集成团、不均匀分布,尺寸较大(10～40μm);富Fe相主要为单斜晶格的Al3Fe及六方晶格的T1相,还有少量的亚稳相Al6Fe等存在。这些相呈粗大针条状、骨骼状存在,并且夹杂物与富Fe相易于聚集在一起。高效熔体处理后,夹杂物量少且尺寸细小(≤4μm),均匀弥散分布;同时富Fe相主要为AlFeSiRE相和极少量Al3Fe相,AlFeSiRE相呈细小团球状(<0.5μm)或短棒状(宽<2μm,长<8μm),沿晶均匀分布,未发现夹杂物与富Fe相聚集成一体的现象。As-cast microstructure features of Al sheet for manufacturing a pressure can with high formability prepared by different melt-treatment technology were observed by SEM (scanning electron microscope),EDAX,TEM (transmission electron microscope) and SAED (selected area electron diffraction). The results reveal that oxide inclusions in the Al sheet are mainly γ-Al2O3 phase,and Fe-rich impurity phases in the Al sheet are mainly Al3Fe,T1(Al12Fe3Si) and AlFeSiRE phase,in which AlFeSiRE phase exhibits complicated non-determined structure. Melt-treatment technologies exhibit remarkable effects on microstructure of as-cast aluminum sheet. There exists much oxide inclusion with large size approximately 10~40 μm in diameters,non-uniform distribution is gathered together in the large block form,and Al3Fe phase,and T1 phase as well as a little metastable phase Al6Fe phase exhibits coarse acicular structure or skeleton structure in the conventional treatment or treated-free aluminum sheet,furthermore,the oxide inclusion is easy to aggregate with Fe-rich phases. While in high efficiency melt-treatment aluminum sheet,there exists a little oxide inclusion with uniformly dispersive distribution and fine size less than 4μm,and Re-rich phases are mainly AlFeSiRE phase and little Al3Fe phase,in which AlFeSiRE phase exhibits fine spheroidal structure with size less than 0.5μm or short rod structure distributing along grain. In addition,the absence of phenomenon of Fe-rich phases gathering together with oxide inclusions can be observed.

关 键 词：罐用铝材 熔体处理 微观组织 氧化夹杂物 富Fe杂质相 

分 类 号：TG146.21[一般工业技术—材料科学与工程]