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

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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.