Fe-Cr-Mo based ODS alloys via spark plasma sintering: A combinational characterization study by TEM and APT

Journal Article · Thu Aug 01 04:00:00 EDT 2013 · Crystal Research & Technology

OSTI ID:1150722

Wu, Y. Q.; Allahar, K. N.; Burns, J.; Jacques, B.; Charit, I; Butt, D. P.; Cole, J. I.

Nanoscale oxides play an important role in oxide dispersion strengthened (ODS) alloys for improved high temperature creep resistance and enhanced radiation damage tolerance. In this study, transmission electron microscopy (TEM) and atom probe tomography (APT) were combined to investigate two novel Fe-16Cr-3Mo (wt.%) based ODS alloys. Spark plasma sintering (SPS) was used to consolidate the ODS alloys from powders that were milled with 0.5 wt.% Y2O3 powder only or with Y2O3 powder and 1 wt.% Ti. TEM characterization revealed that both alloys have a bimodal structure of nanometer-size (~ 100 – 500 nm) and micron-size grains with nanostructured oxide precipitates formed along and close to grain boundaries with diameters ranging from five to tens of nanometers. APT provides further quantitative analyses of the oxide precipitates, and also reveals Mo segregation at grain boundaries next to oxide precipitates. The alloys with and without Ti are compared based on their microstructures.

• Research Organization: Idaho National Laboratory (INL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC07-05ID14517
• OSTI ID: 1150722
• Report Number(s): INL/JOU-13-29390
• Journal Information: Crystal Research & Technology, Journal Name: Crystal Research & Technology Vol. 0
• Country of Publication: United States
• Language: English

Related Subjects

11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
36 MATERIALS SCIENCE
APT
Mo
ODS
Segregation
TEM