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

Journal article (2016)

Authors

S. Zhang RST/Fundamental Aspects of Materials and Energy - AS
H. Fang Novel Aerospace Materials - Aerospace Engineering
C. Kwakernaak (OLD) MSE-1
W.G. Sloof (OLD) MSE-1
F.D. Tichelaar Kavli institute of nanoscience Delft, QN/Zandbergen Lab
E.H. Brück RST/Fundamental Aspects of Materials and Energy - AS
S. van der Zwaag Novel Aerospace Materials - Aerospace Engineering
N.H. van Dijk RST/Fundamental Aspects of Materials and Energy - AS
More Authors... External organisation
Research Group
RST/Fundamental Aspects of Materials and Energy (AS) (TU Delft)
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: https://doi.org/10.1007/s11661-016-3642-0
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Published Date

2016

Language

English

Faculty

Applied Sciences

Department

RST/Radiation, Science and Technology

Research Group

RST/Fundamental Aspects of Materials and Energy

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.