Grain-boundary fracture and boron effect in Ni3Si alloys

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)77-83
Journal / PublicationIntermetallics
Volume4
Issue number1
Publication statusPublished - 1996
Externally publishedYes

Abstract

Intergranular fracture and boron effect in Ni3Si (22·5 at% Si) were studied by tensile testing in various environments at room temperature. Our results indicate that brittle grain-boundary fracture in Ni3Si is caused by two major factors: (1) moisture-induced hydrogen embrittlement, and (2) poor grain-boundary cohesion. Boron is found to segregate strongly to grain boundaries and suppress environmental embrittlement in Ni3Si. Boron, however, does not enhance the cohesive strength of the boundaries. As a result, Ni3Si showed a moderate increase in room-temperature tensile ductility in moist air when doped with boron. Auger analyses indicate that the silicon concentration at the grain boundaries is significantly lower than that in the bulk; however, there is no indication of strong co-segregation of nickel and boron atoms to the boundaries.

Research Area(s)

  • Boron doping, Environmental embrittlement, Grain-boundary fracture, Grain-boundary segregation, Hydrogen embrittlement, Ni3Si alloys, Tensile ductility

Citation Format(s)

Grain-boundary fracture and boron effect in Ni3Si alloys. / Liu, C. T.; George, E. P.; Oliver, W. C.

In: Intermetallics, Vol. 4, No. 1, 1996, p. 77-83.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review