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000427651 245__ $$aHRTEM analysis of the high-temperature phases of the newly developed high-temperature Ni-base superalloy VDM 780 Premium
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000427651 520__ $$aVDM 780 Premium is a recently developed Ni-based superalloy designed for working at high service temperatures (above 650 °C) while keeping the good workability of alloy 718. VDM 780 Premium is based on the austenitic matrix (gamma phase) strengthened by intermetallic Ni3Al-like precipitates (gamma’ phase, fcc L12 structure). Other co-precipitates may be formed in function of the applied heat treatment, such as Ni3Nb-based (delta phase, orthorhombic DOa structure) or Ni3Ti-based (eta phase, hexagonal DO24 structure) precipitates. The amount as well as the size and morphology of the different precipitates depend on the heat treatments performed on the alloy, playing an important role in improving the creep properties or the behavior during forging and recrystallization. This work contains a complex study using various techniques of analytical electron microscopy and synchrotron diffraction intended to clarify the structure of the high-temperature phase formed in the newly developed VDM 780 Premium alloy. The atomic structure of the high-temperature plate-like precipitates formed in VDM 780 Premium after two different thermal treatments has been investigated in relation with the surrounding matrix lattice, proving the stacked d/h structure of the precipitates.
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000427651 7001_ $$0P:(DE-H253)PIP1081258$$aSolís, C.$$b1$$eCorresponding author
000427651 7001_ $$0P:(DE-H253)PIP1081271$$aMunke, Johannes$$b2
000427651 7001_ $$0P:(DE-H253)PIP1011120$$aStark, Andreas$$b3
000427651 7001_ $$0P:(DE-H253)PIP1090093$$aGehrmann, Bodo$$b4
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000427651 7001_ $$aRösler, J.$$b6
000427651 7001_ $$0P:(DE-H253)PIP1009795$$aGilles, Ralph$$b7
000427651 773__ $$0PERI:(DE-600)2012675-X$$a10.1016/j.jallcom.2019.152157$$gVol. 814, p. 152157 -$$p152157 -$$tJournal of alloys and compounds$$v814$$x0925-8388$$y2020
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