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中文摘要：
A206铝合金在金属型浇铸过程中具有高热裂倾向,难以用来制造重要铸件。采用超声分散法制备A206/1%Al2O3（质量分数,下同）纳米复合材料,在钢模中浇铸受限杆铸件来评价其热裂敏感性,利用光学显微镜（OM）和扫描电镜（SEM）对微观组织进行分析。结果表明：加入的Al2O3纳米粒子在凝固过程中成为有效的异质形核核心,不仅使α-Al初晶从粗大枝晶转变为细小等轴晶,平均晶粒尺寸从164μm降至26μm,而且在剩余液相中诱发形成大量富Fe,Mn的薄片状中间相,消除了粗大CuAl2相,从而显著降低了A206铝合金的热裂敏感性。
英文摘要：
A206 aluminum alloy is rarely used in critical applications because of its high propensity for hot cracking.A206/1% Al2O3 nanocomposite was prepared with ultrasonic dispersion method.The hot cracking susceptibility（HCS） was evaluated using constrained rod casting in a steel mold.And microstructure of the alloys was analyzed by Optical Microscopy（OM） and Scanning Electron Microscopy（SEM）.It was observed that the grain structure of α-Al in A206 alloy was changed from large dendritic crystal to small equiaxed one and the grain size was decreased from 164 μm to 26 μm with addition of Al2O3 nanoparticles.In addition,large number of flake-like（Fe,Mn）-rich intermediate phases were formed and coarse CuAl2 phases were eliminated in A206/1% Al2O3 aluminum composite,which significantly decreases its HCS.
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