Ti增强镁基复合材料搅拌铸造中颗粒分散行为的研究

Study of Particle Dispersion Behavior in Stir Casting of Ti Reinforcement Magnesium Matrix Composites

摘要:

利用材料性能模拟软件JMatPro对Mg-Al系合金进行热力学和相转变的计算，得到镁合金在半固态和液态不同温度下粘度变化的规律。使用CFD方法对镁合金熔体的固-液混合过程进行了模拟，计算不同粒径Ti颗粒在不同熔体粘度下在搅拌槽中的分布情况，以及Ti颗粒分散性的变化趋势，并通过在树脂中添加不同比例稀释剂调控粘度值，研究纳米Ti颗粒在不同粘度下的分散行为。结果表明：随着Ti颗粒粒径减小，熔体粘度增加，这有利于Ti颗粒在搅拌槽中各区域分布；在相同搅拌速度下，随着搅拌时间增加延长和熔体粘度提高，Ti颗粒团聚行为明显降低，微观区域明显改善。

Abstract:

The thermodynamic and phase transition of Mg-Al alloys were calculated by the material property simulation software JMatPro to obtain the viscosity variation rule of magnesium alloys at different temperatures in the semi-solid and liquid states. The solid-liquid mixing process in magnesium alloy melt was simulated by the CFD method， and the distribution of Ti particles with different sizes in the stirring tank and the dispersion tendency of Ti particles were calculated under different melt viscosities. The dispersion behavior of Ti nanoparticles at different viscosities was investigated by adding different ratios of diluents in the resin to regulate the viscosity. The results show that the decrease in Ti particle size and the increase in melt viscosity were beneficial to the distribution of Ti particles in each region of the stirred tank. The agglomeration behavior of Ti particles was significantly reduced and the microscopic region was obviously improved with the increase of stirring time and melt viscosity at the same stirring speed.