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

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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.

Original languageEnglish
Pages (from-to)4831-4844
JournalMetallurgical and Materials Transactions A - Physical Metallurgy and Materials Science
Volume47
Issue number10
DOIs
Publication statusPublished - 2016

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