Modelling of short crack growth in single crystal Ni <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.svg"><mml:mrow><mml:mrow><mml:mi mathvariant="normal">γ</mml:mi></mml:mrow><mml:mo linebreak="goodbreak">−</mml:mo><mml:msup><mml:mrow><mml:mi mathvariant="normal">γ</mml:mi></mml:mrow><mml:mo>′</mml:mo></mml:msup></mml:mrow></mml:math> microstructure

Karamitros, Vasilis; MacLachlan, D.W.; Dunne, Fionn P.E.

doi:10.1016/j.actamat.2022.118305

Cited by 25 publications

(1 citation statement)

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“…Both the AT1000 and AT890 samples consisted of the γ′ phase, β phase and η phase. Amongst these, (i) the γ′ precipitates acted as strengthening phase to inhibit the early crack development during creep, 30 (ii) the β-NiAl phases in GBs were demonstrated to enhance the resistance to crack propagation by preventing oxygen diffusion 31 and (iii) the plate-like η phase precipitates 26,27 were likely to be detrimental for the tensile, corrosion and creep-rupture properties. On the basis, a significant coarsening of the irregular γ′ phase would result in its decreased number density and strengthening effect, thus leading to easy crack formation in the AT1000 samples after long-term stress rupture.…”

Section: Resultsmentioning

confidence: 99%

Effects of aluminised-coating on microstructure and properties of Ni–Co-base superalloys

Hong,

Li,

Liu

et al. 2024

Surface Engineering

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A Ni–Co-base superalloy was subjected to three different pack aluminising procedures (1000 °C for 3.5 h, 890 °C for 8 h and 620 °C for 10 h) to produce the Al-rich coating with simultaneously improved oxidation and wear resistance. All samples showed a multi-layer coating made up of (Ni, Fe, Co)Al phase, (Ni, Fe, Co)3Al phase and transition layer. The AT620 sample possessed the lowest oxidation rate but the highest double-edge-notched (DEN) strain during high-temperature stress rupture. The high oxidation resistance might be associated with the creation of Al2O3 layer (∼5.6 μm), contributing to an inhibition of oxygen permeation. However, a premature failure was caused by the strong deformation incompatibility between the substrate and alumina layer. The AT890 samples had higher oxidation and creep-induced-crack resistance than those of the AT1000 samples, which was the result of the effective Al inter-diffusions in the transition layer suppressing the undesirable Cr-rich σ phase.

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Section: Resultsmentioning

confidence: 99%