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- W2034956054 abstract "Cohron et al. recently reported that in the presence of hydrogen boron embrittles polycrystals of Ni{sub 3}Al. The concern is not the observations. Clearly, the environment is a major factor in the case examined. The issue is whether the effect is characteristic of the intermetallic per se. The alternative is that it is related to an attack on nickel-enriched regions adjacent to the grain boundaries. Cohron et al. did not describe the grain boundaries in their alloys. However, other investigators using high resolution techniques have found that at least some grain boundaries in similarly Ni-rich material exhibit nickel concentrations well above the overall alloy composition. Boron increases this enrichment in some cases leading to a detectable disordered grain boundary solid solution. It seems fair to assume that the grain boundaries in Cohron`s alloys were similarly enriched. The other point to note is that hydrogen embrittles both elemental nickel and Ni-based superalloys. It is suggested, therefore, that the embrittlement reported by Cohron et al. may be related more to an attack by hydrogen on Ni-enriched grain boundaries, made richer by the addition of boron, than to an attack on NiAl per se. Consistent with this suggestion are the results of amore » new study on strain rate effects, presented elsewhere. The key point of that study is that high rate deformation (which suppresses environmental attack) does not impart ductility to stoichiometric Ni{sub 3}Al, but does impart ductility to Ni-rich material. The difference is that the stoichiometric alloy does not contain grain boundaries enriched in nickel, implying that its brittleness is an intrinsic quality.« less" @default.
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- W2034956054 date "1998-02-01" @default.
- W2034956054 modified "2023-09-23" @default.
- W2034956054 title "A Comment on “Hydrogen-Boron Interaction and Its Effect on the Ductility and Fracture of Ni3Al”" @default.
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- W2034956054 doi "https://doi.org/10.1016/s1359-6462(97)00531-9" @default.
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