The mushy zone: Understanding the role of permeability

轻金属在汽车工业中的使用不断增加，通过减轻重量来提高燃油经济性和性能的需求。铸造产品通过取代基于铁的部件，如气缸盖和通过零件整合，显示出良好的市场渗透率。虽然轻金属的使用可以提高汽车的能源效率，但需要在上游过程中不断改进，以提高产量和生产能源效率。从历史上看，消除铸造缺陷的策略的发展一直是一个反复试验的过程，但近年来，计算能力的提高，已经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。发展铸造过程的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。糊状层的渗透率是这一挑战的一个很好的例子，因为糊状层微观结构与流动阻力之间的耦合仍在继续研究中。

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.