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Autonomous filling of grain-boundary cavities during creep loading in Fe-Mo alloys

Journal Article (2016)
Author(s)

S. Zhang (TU Delft - RST/Fundamental Aspects of Materials and Energy)

H. Fang (TU Delft - Novel Aerospace Materials)

M. E. Gramsma

Cees Kwakernaak (TU Delft - (OLD) MSE-1)

W.G. Sloof (TU Delft - (OLD) MSE-1)

F.D. Tichelaar (Kavli institute of nanoscience Delft, TU Delft - QN/Zandbergen Lab)

E. H. Brück (TU Delft - RST/Fundamental Aspects of Materials and Energy)

S van der Zwaag (TU Delft - Novel Aerospace Materials)

Niels Harmen H. Dijk (TU Delft - RST/Fundamental Aspects of Materials and Energy)

More Authors (External organisation)

Research Group
RST/Fundamental Aspects of Materials and Energy
Copyright
© 2016 S. Zhang, H. Fang, M. E. Gramsma, C. Kwakernaak, W.G. Sloof, F.D. Tichelaar, E.H. Brück, S. van der Zwaag, N.H. van Dijk, More Authors
DOI related publication
https://doi.org/10.1007/s11661-016-3642-0
More Info
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Publication Year
2016
Language
English
Copyright
© 2016 S. Zhang, H. Fang, M. E. Gramsma, C. Kwakernaak, W.G. Sloof, F.D. Tichelaar, E.H. Brück, S. van der Zwaag, N.H. van Dijk, More Authors
Research Group
RST/Fundamental Aspects of Materials and Energy
Issue number
10
Volume number
47
Pages (from-to)
4831-4844
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Abstract

We have investigated the autonomous repair of creep damage by site-selective precipitation in a binary Fe-Mo alloy (6.2 wt pct Mo) during constant-stress creep tests at temperatures of 813 K, 823 K, and 838 K (540 °C, 550 °C, and 565 °C). Scanning electron microscopy studies on the morphology of the creep-failed samples reveal irregularly formed deposits that show a close spatial correlation with the creep cavities, indicating the filling of creep cavities at grain boundaries by precipitation of the Fe2Mo Laves phase. Complementary transmission electron microscopy and atom probe tomography have been used to characterize the precipitation mechanism and the segregation at grain boundaries in detail.