Publications

Structure-Property Relationships of Additively Manufactured Ni-Nb Alloys [Slides]

Jones, Morgan J.; Kustas, Andrew K.; DelRio, Frank W.; Pegues, Jonathan W.; Lu, Ping L.; Chandross, M.; Argibay, Nicolas A.

In this work, scratch and nanoindentation testing was used to determine hardness, fracture toughness, strain rate sensitivity, and activation volumes on additively manufactured graded and uniform Ni-Nb bulk specimens. Characterization showed the presence of a two phase system consisting of Ni₃Nb and Ni₆Nb₇ intermetallics. Intermetallics were multimodal in nature, having grain and cell sizes spanning from a few nanometers to 10s of micrometers. The unique microstructure resulted in impressively high hardness, up to 20 GPa in the case of the compositionally graded sample. AM methods with surface deformation techniques are a useful way to rapidly probe material properties and alloy composition space.