新型半固态加工专用铝合金的成分设计

采用合金热力学计算方法对Al-Si—Mg系适合半固态加工的合金成分进行了优化设计，并进行了实验验证研究。结果表明：采用国际通用的ThermoCalc软件能够成功地对Al-Si-Mg系合金成分进行优化设计，计算结果与实验结果具有较好地一致性；优化后的Al-6Si-2Mg合金在各工序中都表现出良好的半固态加工性能，连铸和二次加工过程的稳定性和可控性大大提高，坯料的凝固组织更加细化、球化和均质化；通过优化工艺，最终获得了Al-6Si-2Mg合金半固态触变成形的最佳工艺参数和外观完粘、性能优良的半同态压铸件．为半固态触变成形的工业应用打好了基础。

Composition Design on Advanced Aluminum Alloy for Semi-solid Process

The new SSM processing alloys of Al-Si-Mg temary system were designed and optimized by thermodynamic calculation ,and experimental tests were also done based on the above theoretical calculations. It is shown that, the composition design of Al-Si-Mg ternary alloy system can be successfully presented by using the Thermo Calc software and the calculated results are in a good agreement with the experimental ones; the optimized Al-6Si-2Mg alloy shows good processing capabilities in every step of the process including electromagnetic stirring DC casting, reheating and die-casting, and the grain refinement, roundness and homogenization are improved; the optimized processing parameters of the new Al-6Si-2Mg alloy and the die-casting parts with good shape and properties are obtained by optimal processing, which will provide a foundation for the industrial application of this technology.