✍ Scribed by J He; G Han; S Fukuyama; K Yokogawa
No coin nor oath required. For personal study only.
AbstractÐInterfaces in a modi®ed Inconel 718 containing compact precipitates were investigated using high resolution transmission electron microscopy. Morphology con®guration and crystallography of the compact precipitate were con®rmed as cube-shaped g' precipitate and all six faces were coated with a thin shell, these shells could be classi®ed as three variants of disc-shaped g0 precipitates on {001} planes of the matrix, and the [001] orientations (c-axis) of the three variants of g0 precipitate shells were parallel to [001], [010] and [100] orientations of the matrix. The interfaces of g0 precipitate/matrix, g' precipitate/matrix, and g0 precipitate/g' precipitate were fully cube±cube coherent, and the atoms at both sides of the interfaces maintained a perfect match with no disordered structure transition region. It was suggested that the higher thermal stability of the modi®ed Inconel 718 alloy than that of conventional Inconel 718 alloy was due to the morphology con®guration of the compact precipitate and fully coherent interfaces among the g' precipitate, g0 precipitate and matrix.
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