Tin-induced dynamic embrittlement of Cu–7% Sn bicrystals with a Σ5 boundary

Muthiah, Ranjani C.; Pfaendtner, J.A.; Ishikawa, Shinya; McMahon, C.J.

doi:10.1016/s1359-6454(99)00117-2

Cited by 30 publications

(40 citation statements)

References 25 publications

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“…Figure 1 illustrates schematically this kind of time-dependent damage mechanism. Dynamic embrittlement was shown to cause intergranular failure for several alloys and different embrittling species in earlier studies, e.g., sulfur-induced cracking of alloy steels 13 , tin-induced cracking of Cu-Sn alloys 14 and oxygen-induced cracking of a Cu-Be alloy 15 , of a Ni-Mo-Cr alloy 16 , and of the intermetallic alloy Ni 3 Al…”

Section: Dynamic Embrittlementmentioning

confidence: 94%

Oxygen-induced intergranular fracture of the nickel-base alloy IN718 during mechanical loading at high temperatures

et al. 2004

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There is a transition in the mechanical-failure behavior of nickel-base superalloys from ductile transgranular crack propagation to time-dependent intergranular fracture when the temperature exceeds about 600 °C. This transition is due to oxygen diffusion into the stress field ahead of the crack tip sufficient to cause brittle decohesion of the grain boundaries. Since very high cracking rates were observed during fixed-displacement loading of IN718, it is not very likely that grain boundary oxidation governs the grain-boundary-separation process, as has been proposed in several studies on the fatigue-damage behavior of the nickel-base superalloy IN718. Further studies on bicrystal and thermomechanically processed specimens of IN718 have shown that this kind of brittle fracture, which has been termed "dynamic embrittlement", depends strongly on the structure of the grain boundaries.

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Section: Dynamic Embrittlementmentioning

confidence: 94%

Oxygen-induced intergranular fracture of the nickel-base alloy IN718 during mechanical loading at high temperatures

et al. 2004

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“…The interpretation of these crack surfaces is as follows: At the higher oxygen pressures the crack remained sharp and propagated in rapid jumps. Whereas in a Cu-Sn bicrystal the crack growth was continuous [17], it has been found to be discontinuous in all the cases of polycrystals studied so far [9,10,13,14]. This occurs because the rate of crack advance depends on the rate of diffusion of the embrittling element into the grain boundary ahead of the crack.…”

Section: Cracking Under Fixed Displacementmentioning

confidence: 98%

“…It was found that cracking can occur in the alloy 7 18 at stress intensities below 10MPadm. The Cu-Sn bicrystals [17] cracked at stress intensities below 3Mpadm. Secondly, the temperature dependence of the cracking was closer to that of self-diffusion in nickel than to oxygen diffusion in nickel grain boundaries [14].…”

Section: Cracking Under Fixed Displacementmentioning

confidence: 99%

“…The cracking involves diffusive penetration of grain boundaries ahead of a sharp crack tip, as demonstrated by experiments on bicrystals of Cu-Sn [17]. Thus, having an innocuous element segregated to the grain boundaries that would act to inhibit grain-boundary diffusion should also inhibit crack growth.…”

Section: Possible Remedies For Dynamic Embrittlementmentioning

confidence: 99%

“…Such a boundary would be said to have a C value of less than 29. There is every reason to believe that the GBE approach would work also for dynamic embrittlement, because it is so sensitive to grain-boundary structure [8,9,14,17]. This is an area that very much deserves further study.…”

Section: Possible Remedies For Dynamic Embrittlementmentioning

confidence: 99%

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Dynamic Embrittlement in Alloy 718

Pfaendtner¹,

McMahon²

2001

Superalloys 718, 625, 706 and Various Derivatives (2001)

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The bxygen-induced intergranular cracking of alloy 71 8 under static loads has been found to be similar to that of sulfur-induced cracking in steels, tin-induced cracking in a Cu-Sn alloy, and oxygen-induced cracking in Cu-0.25%Be and in Ni3A1, all under static loads. These are all examples of a type of fracture called "dynamic embrittlement." This appears to be the same phenomenon as observed during cyclic loading of alloy 7 18, especially with extended hold times, and it is considered that the cyclic nature of the loading is incidental to the cracking process.

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