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

尽管工程材料数量众多，但目前材料属性空间存在巨大缺口。这项研究解决了对轻质结构金属的重大需求，这些金属可以承受航空航天和地面车辆应用中的高温。轻质金属泡沫可以通过引入内部空隙结构来制造，从而在超低密度下提供良好的强度重量比和刚度重量比。然而，这些通常由诸如铝的轻质金属制成，并且不适合于高温应用。另一方面，镍基高温合金具有优异的高温稳定性，但遭受高密度和晶间失效机制。该项目将采用最好的蜂窝材料设计和最好的界面工程来开发一种新型的混合材料，该混合材料将晶界工程高温合金的高温稳定性与周期性蜂窝金属的轻质结构性能相结合。它将通过减少部件重量和允许更高的发动机工作温度来提高地面车辆和航空航天应用的效率。该项目的支持机构是Integran Technologies Inc.，这是一家加拿大私营公司，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.