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混沌對流下的半固態(tài)A356鋁合金初生相形貌演變研究
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更新時(shí)間：2015-10-16
研究了半固態(tài) A356 鋁合金熔體中混沌對流的表征, 及電磁場誘發(fā)的混沌對流對半固態(tài) A356 鋁合金熔體中初生相形貌
演變的影響. 通過 Fluent 軟件研究了電磁場作用下 A356 鋁熔液中微粒的流動(dòng)軌跡, 計(jì)算了這些流動(dòng)軌跡的 Kolmogorov 熵和分形維數(shù), 證明了施加適當(dāng)?shù)碾娏黝l率能在合金熔體中產(chǎn)生混沌運(yùn)動(dòng). 結(jié)合實(shí)驗(yàn)研究, 對不同電流頻率及工藝參數(shù)的實(shí)驗(yàn)結(jié)果進(jìn)行對比.
混沌對流下的半固態(tài)A356鋁合金初生相形貌演變研究RESEARCH ON MORPHOLOGY EVOLUTION OF PRIMARY PHASE IN SEMISOLID?A356 ALLOY UNDER CHAOTIC ADVECTION
研究了半固態(tài) A356 鋁合金熔體中混沌對流的表征, 及電磁場誘發(fā)的混沌對流對半固態(tài) A356 鋁合金熔體中初生相形貌演變的影響. 通過 Fluent 軟件研究了電磁場作用下 A356 鋁熔液中微粒的流動(dòng)軌跡, 計(jì)算了這些流動(dòng)軌跡的 Kolmogorov 熵和分形維數(shù), 證明了施加適當(dāng)?shù)碾娏黝l率能在合金熔體中產(chǎn)生混沌運(yùn)動(dòng). 結(jié)合實(shí)驗(yàn)研究, 對不同電流頻率及工藝參數(shù)的實(shí)驗(yàn)結(jié)果進(jìn)行對比. 研究結(jié)果表明, A356 鋁合金熔體在 650 ℃澆注, 電流頻率為 30 Hz 的電磁場中攪拌 15 s, 并在 590 ℃保溫 10?min, 此時(shí)凝固系統(tǒng)的 Kolmogorov 熵為 6829.5 nats/s, 分形維數(shù)為 2.2439, 初生相的平均等積圓直徑為 59.86 μm, 平均形狀因子為 0.71, 此時(shí)晶粒最圓整細(xì)小, 組織形貌最佳.?
Chaotic advection could be strengthened mix, mass transfer and heat transfer in the viscous fluid, the melt flow?forming was affected by electromagnetic field in the metal solidification process, so were the macro and microstructure of materials.?So it was necessary to study chaotic characteristics of semisolid Al alloy in the electromagnetic field. The characterization of chaotic?convention and morphology of primary phase were mainly researched in semisolid A356 alloy under the electromagnetic field. The?trajectories of the particle in semisolid A356 alloy melt was simulated by the computational fluid dynamics software Fluent, the?Kolmogorov entropy and Fractal dimension of the flow trajectories of semisolid A356 alloy melt were judged and analyzed. The?results showed that chaotic advection may happen in semisolid alloy melt under electromagnetic field. Combined with experiment,?the results of process parameters and different current frequencies were compared. The results showed that the primary phase with?59.86 μm in average equal-area circle diameter, 0.71 in average shape factor, 6829.5nats/s of Kolmogorov entropy and 2.243 of?Fractal dimension can be obtained in semisolid A356 alloy with pouring 650℃, stirring for 15s at 30Hz, and holding at 590℃for?10min. Meanwhile, the morphology of primary phase can be observed with the best parameters.?
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