半固态A356合金触变铸造流变特性的研究

The Investigation on the Rheological Behavior for Thixocasting of Semi-Solid Aluminum Alloy (A356)

研究在压铸环境下,二次加热温度为570～580℃时,半固态铝合金触变铸造的流变特性。剪切速率在2×(103～104)s-1范围,半固态铝合金触变铸造过程呈现为伪塑性流体流变特性;当剪切速率大于106 s-1时,半固态铝合金触变铸造的流变特性为涨塑性;获得了基于幂定律的半固态铝合金(A356)触变铸造过程的流变方程以及由此得到的粘度模型。

Under the conditions of die casting and reheating temperature of 570℃ - 580 ℃ , the rheological behavior for thixocasting of simi-solid aluminum alloy (A356) is pseudoplasticity at shear rate of 2 × 103 - 104 s-1 ,and is dilatancy at the shear rate over 106 s-1 . It is given the new viscosity model of metal mush during the thixocasting.