The mushy zone: Understanding the role of permeability

随着对通过减轻重量来提高燃油经济性和性能的需求，汽车行业中的轻金属使用量继续增加。铸造产品通过更换气缸盖等铁基部件和进行零件加固，显示出良好的市场渗透率。虽然轻金属的使用可能会提高车辆的能源效率，但需要在上游工艺中不断改进，以提高产量和生产能源效率。消除铸造缺陷的策略的发展历史上一直是一个反复尝试的过程，但近年来，随着计算能力的增加，导致使用计算机来模拟铸造操作并提供铸造系统的定量知识。建立铸造过程综合定量模型的主要困难之一是描述微观和宏观尺度现象之间的联系。糊状区渗透性是这一挑战的一个很好的例子，因为糊状区微观结构和流动阻力之间的耦合仍在继续研究。

Light metals usage in the automotive industry continues to increase with the demand for improved fuel economy and performance through weight savings. Cast products have shown good market penetration by replacing ferrous based components such as cylinder heads and through part consolidation. While light metals usage may advance vehicle energy efficiency, continuous improvement is needed in the upstream processes to increase yield and production energy efficiency. The development of strategies to eliminate casting defects has historically been a trial and error process, but in recent years, the advent of increased computational capabilities, has led to the use of computers to model casting operations and provide quantitative knowledge of casting systems. One of the main difficulties in developing comprehensive quantitative models of casting processes is describing the link between micro and macro scale phenomena. Mushy zone permeability is a good example of this challenge as the coupling between mushy zone microstructure and the resistance to flow continues to be investigated.