Autonomous Filling of Grain-Boundary Cavities during Creep Loading in Fe-Mo Alloys

作者：Zhang S; Fang H; Gramsma M E; Kwakernaak C; Sloof W G; Tichelaar F D; Kuzmina M; Herbig M; Raabe D; Bruck E; Van der Zwaag S; Van Dijk N H^*

来源：Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science, 2016, 47A(10): 4831-4844.

DOI：10.1007/s11661-016-3642-0

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 A degrees C, 550 A degrees C, and 565 A degrees 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.

• 出版日期2016-10