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特种铸造及有色合金最新文献

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Observation of As-cast Microstructure Feature of Al Sheet Used for Can Manufacturing with High Forming Properties 高成形性能罐用铝板材铸态组织特征观察
Q4 Materials Science Pub Date : 2008-01-01 DOI: 10.4028/0-87849-432-4.983
Qian Kuangwu
As-cast microstructure feature of Al sheet used for pressure can manufacture with high forming properties prepared by different melt-treatment technology was investigated and analyzed with the aids of SEM, EDAX, TEM and selected area electron diffraction(SAED), etc. It is found that oxide inclusions in the Al sheet are mainly γ-Al2O3, and Fe-rich impurity phases in the sheet are mainly Al3Fe,T1 (Al12Fe3Si) or (AlFeSiRE),and the crystal structure of (AlFeSiRE) phase is too complicated to determinate it. The effect of melt-treatment technology on the as-cast microstructure of the sheet is remarkable. When the Al sheet is prepared by no or conventional melt-treatment, there are a number of oxide inclusions, these inclusions distribute non-uniformly and gather together in the larger block form, and their size is about 10-40 μm. Fe-rich impurity phases in the sheet are mainly Al3Fe and T1, and a few of the meta-stable phase Al6Fe exist in Al sheet. These Fe-rich impurity phases appear in the coarse, long needle/flake or skeletal form, and are easy to gather together with oxide inclusions. When the Al sheet is prepared by high-efficient melt-treatment, the number of oxide inclusions is very few obviously, and their size is about or less than 4μm, and their distribution is uniform; Fe-rich impurity phases are mainly (AlFeSiRE), and a small amount of Al3Fe phases also exist in the material. (AlFeSiRE) phases distribute uniformly along grain boundary in tiny group/sphere or short stick form. The phenomenon that Fe-rich phases gather together with oxide inclusions is not discovered in the material.
利用扫描电子显微镜(SEM)、电子能谱(EDAX)、透射电子显微镜(TEM)和选择区域电子衍射(SAED)等手段,对不同熔体处理工艺制备的高成形性能压力罐用铝板材的铸态组织特征进行了研究和分析。发现Al片中的氧化物夹杂物主要为γ-Al2O3,片中富铁杂质相主要为Al3Fe、T1 (Al12Fe3Si)或(AlFeSiRE),且(AlFeSiRE)相的晶体结构过于复杂,难以测定。熔体处理工艺对铸态组织的影响是显著的。在未熔炼处理和常规熔炼处理的Al薄片中,存在大量的氧化物夹杂物,这些夹杂物分布不均匀,以较大的块状形式聚集在一起,其尺寸约为10 ~ 40 μm。薄片中富铁杂质相主要为Al3Fe和T1, Al薄片中存在少量亚稳定相Al6Fe。这些富铁杂质相呈粗状、长针状/片状或骨架状,易与氧化物夹杂物聚集在一起。采用高效熔体处理制备Al片材时,氧化物夹杂物数量明显少,尺寸在4μm左右或小于4μm,分布均匀;材料中主要存在富铁杂质相(AlFeSiRE),少量Al3Fe相也存在。(AlFeSiRE)相沿晶界均匀分布,呈微团/球或短棒状。材料中未发现富铁相与氧化物夹杂物聚集的现象。
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特种铸造及有色合金
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