Influence of grain boundary composition on the moisture-induced embrittlement of Ni3(Si,Ti) alloys

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

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Author(s)

  • T. Takasugi
  • C.T. Liu
  • L. Heatherly
  • E.H. Lee
  • E.P. George

Detail(s)

Original languageEnglish
Pages (from-to)543-551
Journal / PublicationIntermetallics
Volume7
Issue number5
Online published24 Mar 1999
Publication statusPublished - May 1999
Externally publishedYes

Abstract

Ni3(Si,Ti) alloys containing different levels of boron were tensile tested in air at room temperature at two different strain rates. The grain boundary compositions and fracture modes of these alloys were determined by Auger spectroscopy and scanning electron microscopy, respectively. Tensile elongation and fracture mode depend upon the fabrication procedure, heat treatment, and strain rate. Widely different boron concentrations were observed at the grain boundaries, depending on the fabrication procedure and heat treatment. In addition, silicon and titanium were depleted while nickel was enriched at the grain boundaries in all specimens examined. Tensile elongations correlated well with the grain boundary concentration of boron and also with an embrittlement parameter defined as (Si+Ti-B)/Ti. A sharp brittle-ductile transition was found to occur with increasing grain boundary concentration of boron and with decreasing values of the embrittlement parameter (Si+Ti-B)/Ti. The critical grain boundary concentrations corresponding to this transition were found to be sensitive to the strain rate. All the results can be explained in terms of the effect of grain-boundary composition on moisture-induced environmental embrittlement.

Research Area(s)

  • Silicides, various, Environmental embrittlement, Interstitial content; control, Grain boundaries; structure, Spectroscopic methods, various

Citation Format(s)

Influence of grain boundary composition on the moisture-induced embrittlement of Ni3(Si,Ti) alloys. / Takasugi, T.; Liu, C.T.; Heatherly, L.; Lee, E.H.; George, E.P.

In: Intermetallics, Vol. 7, No. 5, 05.1999, p. 543-551.

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