This paper reports a study of grain boundary segregation and fracture modes in Ll2 intermetallic compounds. Data obtained on Ni3A1, Ni3Si, Ni3Ga, Ni3Ge, and Pt3Ga will be presented. It will be shown that the amount of boron segregation and its ability to improve cohesion depends on the total composition of the compound. The beneficial effects of boron can be counteracted by the presence of borides on the grain boundaries. Carbon additions also produce some improvement in ductility in Ni3Si.
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Briant, C.L., Taub, A.I. Fracture Modes in Ll2 Compounds. MRS Online Proceedings Library 133, 281 (1988). https://doi.org/10.1557/PROC-133-281