Grain boundary engineered periodic cellular superalloys: low density, high temperature stable hybrid materials

尽管有大量的工程材料，但目前在材料性能空间上存在着巨大的差距。这项研究解决了对能够承受航空航天和地面车辆应用中的高温的轻质结构金属的重大需求。轻质金属泡沫可以通过结合内部空隙结构来制造，在超低密度下提供良好的强度与重量比和刚度与重量比。然而，这些材料通常由铝等轻质金属制成，不适合高温应用。另一方面，镍基高温合金具有良好的高温稳定性，但存在高密度和沿晶失效机制。该项目将结合晶界工程高温合金的高温稳定性和周期性胞状金属的轻质结构性能，结合蜂窝状材料设计和界面工程的优点，开发出一种新型的杂化材料。它将通过减轻部件重量和允许更高的发动机运行温度来提高地面车辆和航空航天应用的效率。该项目的支持组织是加拿大一家私人所有的公司，也是先进冶金纳米技术的世界领先者。

Despite the large number of engineering materials, there are currently enormous gaps in material property space. This study addresses the significant need for lightweight structural metals that can withstand the high temperatures seen in aerospace and ground-based vehicle applications. Lightweight metal foams can be made by incorporating an internal void structure, providing good strength-to-weight and stiffness-to-weight ratios at ultra-low density. However, these are typically made from lightweight metals such as aluminum and are unsuitable for high temperature applications. On the other hand, nickel-based superalloys have excellent high temperature stability but suffer from high density and intergranular failure mechanisms. This project will take the best of cellular materials design and the best of interfacial engineering to develop a new type of hybrid material that combines the high temperature stability of grain boundary engineered super-alloys with the lightweight structural performance of periodic cellular metals. It will enable efficiency improvements in both ground vehicle and aerospace applications by reducing component weight and allowing higher engine operating temperatures. The supporting organization for this project is Integran Technologies Inc., a privately owned Canadian company and a world leader in advanced metallurgical nanotechnologies.