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電磁場作用下半固態A356-La鋁合金初生相形貌及分形維數的研究
發布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新時間：2016-04-02
利用稀土 La 對液態 A356 鋁合金進行了細化處理, 并在電磁攪拌技術下制備了半固態 A356-La 鋁合金漿料, 研究了稀土La 和電磁攪拌對半固態 A356 鋁合金初生相形貌的影響, 并用分形維數對其初生相形貌進行了表征.
電磁場作用下半固態A356-La鋁合金初生相形貌及分形維數的研究RESEARCH ON THE MORPHOLOGY AND FRACTAL?DIMENSION OF PRIMARY PHASE IN SEMISOLID A356-La?ALUMINUM ALLOY BY ELECTROMAGNETIC STIRRING
利用稀土 La 對液態 A356 鋁合金進行了細化處理, 并在電磁攪拌技術下制備了半固態 A356-La 鋁合金漿料, 研究了稀土La 和電磁攪拌對半固態 A356 鋁合金初生相形貌的影響, 并用分形維數對其初生相形貌進行了表征. 結果表明, 添加適量的稀土 La 可有效改善半固態 A356 鋁合金初生相的形貌, 無論是否經過電磁攪拌, 隨著稀土添加量的增加, A356 鋁合金的初生相形貌均呈先變好后惡化的演變規律, 當稀土La 的添加量為 0.4% (質量分數)時, 其初生 α 相的形貌和尺寸均達到最佳, 其平均等徑圓直徑為 88.85 μm,?平均形狀因子為 0.78; 當稀土 La 的添加量相同時, 經過電磁攪拌作用的 A356-La 鋁合金初生 α 相的平均等積圓直徑均比未經過電磁攪拌的更小, 其形狀因子則相反, 均比未經過電磁攪拌的更大, 說明經過電磁攪拌的半固態 A356 鋁合金初生 α 相比未攪拌過的更細小、圓整, 即經過電磁攪拌的初生 α 相形貌更佳, 如當La含量均為0.4%時, 其平均等徑圓直徑由88.85 μm 降至84.14 μm, 平均形狀因子由0.78升至0.81. 此外, 實際的合金凝固組織具有分形特征, 應用分形幾何的原理來描述和分析半固態鋁合金中初生相的形貌變化規律甚至初生相形成機理是完全可能的. 且不同工藝參數下所獲得的半固態鋁合金初生相形貌具有不同的分形維數, 隨著半固態初生相由樹枝狀向顆粒狀或球狀變化, 其分形維數逐漸變小.?
In order to obtain the fine, round and uniform distribution primary α phase in semisolid A356?alloy, the different amount of La was added into the alloy melt, and the melt was poured at 650 ℃ and slightly?electromagnetically stirred under the condition of 30 Hz and 15 s, then, it was isothermally held at 590 ℃ for 10?min. The microstructure of the samples was observed by OM and SEM. The influences of La and electromagnetic?stirring on morphology of primary α phase in semisolid A356 alloy were studied, and the symbolization of the?characteristics of morphology of primary α phase by the fractal dimension was discussed in the paper. The results?showed that the morphology of primary α phase in semisolid A356 alloy was effectively improved by the suitable?addition of La, no matter whether the semisolid slurry of A356-La alloy was prepared by electromagnetic stirring?or not, the morphology of primary α phase showed better at first and then worse as the amounts of La increases,?and the morphology and grain size of primary α phase reach the optimal state when the content of La was 0.40%?(mass fraction). At the same time, the average equal-area circle diameter of the morphology of primary phase in?semisolid A356-La alloy by electromagnetic stirring was finer than that without stirring, on the other hand, the?shape factor was bigger than that without stirring. It implies that the primary α phase in semisolid A356-La alloy?by electromagnetic stirring was smaller and more rounded than that without stirring, that is, the morphology of?primary α phase in semisolid A356-La alloy by electromagnetic stirring was better than that without stirring. In?addition, the real microstructure has fractal characteristics, and it was feasible to describe and analyze the change?regularity and even the formation mechanism of the morphology of primary α phase in semisolid aluminum alloy?by the principle of fractal geometry. The morphology of primary α phase in semisolid A356 alloy by the different?process parameters had different fractal dimension. The fractal dimension of the semisolid primary α phase?gradually became smaller with its morphology changed from dendritic-like to particle-like or globular-like.
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