流变压铸工艺参数对半固态A356铝合金充填性的影响

研究了半固态A356铝合金浆料的成形温度、压射比压和压射冲头速度对半固态A356铝合金流变压铸充填性的影响.实验结果表明:较高的半固态A356铝合金浆料的成形温度有利于获得良好的充填性.压射比压和压射冲头速度对半固态A356铝合金浆料充填性也具有较大的影响.在本实验条件下,压射冲头速度越大或压射比压越大,充填性越好.试片的壁厚对半固态A356铝合金浆料的充填性影响较大,试片壁厚越大,越容易充填.此外,采用低过热度浇注和弱电磁搅拌技术制备的A356铝合金浆料和流变压铸试片的组织分布很均匀,有利于获得优质的半固态压铸件.

Effect of technological parameters on filling behavior of semi-solid A356 alloy by rheocasting

The effect of forming temperature, injection pressure and piston velocity on the filling ability of semi-solid A356 aluminum alloy slurry were investigated. It is shown that a higher forming temperature helps to the good filling ability, and injection pressure and piston velocity have important effect on the filling ability. The higher the injection pressure, or the higher the piston velocity, the better the filling ability is. Besides the thickness of a sample piece has great effect on the filling ability, and the thicker the sample piece, the better the filling ability. The results also show that the microstructure distribution of A356 semi-solid alloy is homogeneous, which is helpful to high quality castings.