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References

2011
Articles:
•	Dehmas, Moukrane, Lacaze, Jacques, Niang, Aliou and Viguier, Bernard TEM Study of High-Temperature Precipitation of Delta Phase in Inconel 718 Alloy Advances in Materials Science and Engineering, 2011:9 2011 ISSN: 1687-6822 DOI: 10.1155/2011/940634 Resume: Inconel 718 is widely used because of its ability to retain strength at up to 650 degrees C for long periods of time through coherent metastable gamma `' Ni(3)Nb precipitation associated with a smaller volume fraction of gamma' Ni(3)Al precipitates. At very long ageing times at service temperature, gamma `' decomposes to the stable Ni(3)Nb delta phase. This latter phase is also present above the gamma `' solvus and is used for grain control during forging of alloy 718. While most works available on delta precipitation have been performed at temperatures below the gamma `' solvus, it appeared of interest to also investigate the case where delta phase precipitates directly fromthe fccmatrix free of gamma `' precipitates. This was studied by X-ray diffraction and transmission electron microscopy (TEM). TEM observations confirmed the presence of rotation-ordered domains in delta plates, and some unexpected contrast could be explained by double diffraction due to overlapping phases. Equipe: Département SI2M : Microstructures et Contraintes

2011

Articles:

•

Dehmas, Moukrane, Lacaze, Jacques, Niang, Aliou and Viguier, Bernard

TEM Study of High-Temperature Precipitation of Delta Phase in Inconel 718 Alloy

Advances in Materials Science and Engineering, 2011:9

2011

ISSN: 1687-6822

DOI: 10.1155/2011/940634

Resume: Inconel 718 is widely used because of its ability to retain strength at up to 650 degrees C for long periods of time through coherent metastable gamma `' Ni(3)Nb precipitation associated with a smaller volume fraction of gamma' Ni(3)Al precipitates. At very long ageing times at service temperature, gamma `' decomposes to the stable Ni(3)Nb delta phase. This latter phase is also present above the gamma `' solvus and is used for grain control during forging of alloy 718. While most works available on delta precipitation have been performed at temperatures below the gamma `' solvus, it appeared of interest to also investigate the case where delta phase precipitates directly fromthe fccmatrix free of gamma `' precipitates. This was studied by X-ray diffraction and transmission electron microscopy (TEM). TEM observations confirmed the presence of rotation-ordered domains in delta plates, and some unexpected contrast could be explained by double diffraction due to overlapping phases.

Equipe: Département SI2M : Microstructures et Contraintes

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