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Complexions are phase-like interfacial features that can influence a widevariety of properties, but the ability to predict which material systems cansustain these features remains limited. Amorphous complexions are of particularinterest due to their ability to enhance diffusion and damage tolerancemechanisms, as a result of the excess free volume present in these structures.In this paper, we propose a set of materials selection rules aimed atpredicting the formation of amorphous complexions, with an emphasis on (1)encouraging the segregation of dopants to the interfaces and (2) lowering theformation energy for a glassy structure. To validate these predictions, binaryCu-rich metallic alloys encompassing a range of thermodynamic parameter valueswere created using sputter deposition and subsequently heat treated to allowfor segregation and transformation of the boundary structure. All of the alloysstudied here experienced dopant segregation to the grain boundary, butexhibited different interfacial structures. Cu-Zr and Cu-Hf formed nanoscaleamorphous intergranular complexions while Cu-Nb and Cu-Mo retained crystallineorder at their grain boundaries, which can mainly be attributed to differencesin the enthalpy of mixing. Finally, using our newly formed materials selectionrules, we extend our scope to a Ni-based alloy to further validate ourhypothesis, as well as make predictions for a wide variety of transition metalalloys.

Materials selection rules for amorphous complexion formation in binary metallic alloys