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橢圓旋扭管反復凝熔法制備半固態A356鋁合金漿料
發布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時間：2015-09-22
采用橢圓旋扭管反復凝熔法制備半固態A356鋁合金漿料。
橢圓旋扭管反復凝熔法制備半固態A356鋁合金漿料Preparation of semi-solid A356 Al alloy slurry by?repeated heating-cooling method with elliptical-twisted tubes
采用橢圓旋扭管反復凝熔法制備半固態A356鋁合金漿料。結果表明：橢圓旋鈕管反復凝熔技術具有旋扭強制對流促進初生晶核游離、自攪拌加強熔體剪切、反復凝熔促進形核的作用，可使初生α晶核演變為球形或近球形晶粒。橢圓管長短軸比、旋扭強度以及凝熔頻率對半固態漿料的微觀組織有顯著影響。隨著長短軸比、旋扭強度和凝熔頻率的增大，晶粒細化和圓整效果顯著提高；但長短軸比過大，容易堵塞流道；當旋扭強度超過13.5 (°)/cm時，晶粒細化和圓整效果沒有明顯提高；當凝熔頻率超過40 μm?1時，晶粒細化作用不再增強，圓整度反而降低。在橢圓長短軸比為1.8?1、旋扭強度為13.5 (°)/cm、凝熔頻率為40 μm?1的條件下可制得晶粒直徑細小、形狀圓整的半固態漿料。
The semi-solid slurry of A356 aluminum alloy was prepared by the repeated heating-cooling method with the elliptical-twisted tubes. The results indicate that by the repeated heating-cooling method with elliptical-twisted tubes the microstructures of primary grains are transformed from dendritic or rosette-shaped to fine net-globular under the action of grains detachment due to the forced convection, shear caused by self-stirring and heterogeneous nucleation because of repeated heating/cooling. The axial ratio, twisting strength and heating-cooling frequency have significant influences on the microstructure of the semi-solid slurry. With the increase of axial ratio, twisting strength and heating-cooling frequency, the grain refinement and sphericity of particles have remarkable improvement. However, at the twisting strength over 13.5 (°)/cm and heating-cooling frequency over 40 μm?1, the grain refinement does not have a much improvement and the sphericity decreases on the contrary. At the axial ratio of 1.8:1, twisting strength of 13.5 (°)/cm and heating-cooling frequency of 40 μm?1, the favorable microstructure of semi-solid A356 aluminum alloy can be generated by the repeated heating-cooling method with the elliptical-twisted tubes.
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