中文摘要：

应用自行设计倾斜式冷却剪切实验装置，对制备Al-3％Mg半固态合金坯料进行研究，分析工艺条件对半固态合金组织的影响，以及半固态合金坯料的二次加热组织及最优二次加热工艺。结果表明，采用倾斜式冷却剪切技术可以制备具有良好组织的Al-3％Mg合金半固态坯料。获得了制备半固态Al-3％Mg合金坯料的最优工艺条件：浇注温度660-680℃；倾角40°～60°。在合理的二次加热工艺条件下，可获得优良的适于进行触变成形的半固态合金组织。二次加热的最优工艺条件为：加热温度620～63℃；保温时间90～120min。

英文摘要：

By using the self-designed experimental setup of sloping cooling/shearing, preparing semisolid billet of Al-3%Mg alloy was studied. The effects of technological conditions on the microstructures of the semisolid alloy were analyzed, The microstructures of the remelted semisolid billet were observed and the optimal remelting process was investigated. The results show that the semisolid billet of A1-3% Mg alloy with good microstructures can be obtained by the sloping cooling/shearing process. The optimal process conditions for preparing semisolid billet of Al-3%Mg alloy were obtained： pouring temperature is in the range of 660 - 680℃, sloping angle is in the range of 40°- 60°. Under the proper remelting conditions, the excellent semisolid microstructures that are suitable for semisolid forming can he obtained. The optimal conditions of remelting process are： remelting temperature range of 620 - 630 ℃, holding time range of 90 - 120 min.