二維振動(dòng)參數(shù)對半固態(tài)ZL104合金微觀組織的影響Effect of parameters of two dimensional vibration on microstructures of semi-solid ZL104 alloy

利用自制的傾斜板內(nèi)安置擾流柱，可實(shí)現(xiàn)三維振動(dòng)的傾斜剪切流變裝置，研究二維振動(dòng)方向和振動(dòng)頻率對半固態(tài)ZL104合金組織的影響，分析振動(dòng)方向XY、YZ、XZ對半固態(tài)ZL104合金組織的作用機(jī)理。結(jié)果表明：振動(dòng)方向?yàn)閄Z時(shí)，傾斜板上向下流動(dòng)的合金液中，初生枝晶和液體之間產(chǎn)生的相對運(yùn)動(dòng)較大，初生晶粒之間發(fā)生碰撞和摩擦的幾率多，晶粒細(xì)小，形狀圓整；合金液在傾斜板上滯留的時(shí)間長，初生固相率高。隨振動(dòng)頻率增大，晶粒尺寸減小，形狀因子增大。當(dāng)振動(dòng)頻率為50 Hz時(shí)，初生固相率為56.09%，晶粒尺寸為6.53 μm，形狀因子為0.57。

The influence of two dimensional vibration directions and frequency on the structures of ZL104 alloy was studied by the disturbing pillars installed in a self-designed sloping board, which is a rheological experimental facility with sloping, cooling and shearing function and three-dimensional vibration function. The action mechanism of vibration direction XY, YZ and XZ on the microstructure of the alloy was analyzed. The results show that on the vibration direction XZ, the relative motion given between primordial dendrite and molten ZL104 alloy is severe in molten ZL104 alloy down flow on the sloping board. Because the probability of collision and friction among the primordial grains is plentiful, the grains are refined, and their shapes are orbicular. The long the residence time of the molten ZL104 alloy on the sloping board, the plentiful the primordial solid phase. With the increase of vibration frequency, the shape factor increases and the grain size decreases. When the vibration frequency is 50 Hz, the proportion of primordial solid phase reaches 56.09%, the grain size is 6.53 μm and the shape factor is 0.57.

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