The effect of B addition on charge distribution in Co3Ti

In this paper, the chemistries at grain boundaries in Co3Ti intermetallics with and without boron doping were examined. The charge density distributions of the two kinds of alloys were obtained by their experimentally determined structure factors. The differences between them were analyzed and compared with the effect of boron on charge density distribution in Ni3Al. It is found that B has quite different effects on the charge distribution, and segregation behavior as well as mechanical properties in Co3Ti and Ni3Al. It is concluded that boron has no effect on suppressing the environmental embrittlement in Co3Ti because of the weakened Co–B–Co bonding.