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

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

Zhang, S. (TU Delft RST/Fundamental Aspects of Materials and Energy)
Fang, H. (TU Delft Novel Aerospace Materials)
Gramsma, M. E.
Kwakernaak, C. (TU Delft (OLD) MSE-1)
Sloof, W.G. (TU Delft (OLD) MSE-1)
Tichelaar, F.D. (TU Delft QN/Zandbergen Lab; Kavli institute of nanoscience Delft)
Brück, E.H. (TU Delft RST/Fundamental Aspects of Materials and Energy)
van der Zwaag, S. (TU Delft Novel Aerospace Materials)
van Dijk, N.H. (TU Delft RST/Fundamental Aspects of Materials and Energy)

2016

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.

http://resolver.tudelft.nl/uuid:fcaf327a-0997-48b8-98ec-c0291711a2c9

https://doi.org/10.1007/s11661-016-3642-0

1073-5623

Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science, 47 (10), 4831-4844

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journal article

© 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