In situ high-energy X-ray diffraction study of tensile deformation of neutron-irradiated polycrystalline Fe-9%Cr alloy

Zhang, Xuan; Li, Meimei; Park, Jun -Sang; Kenesei, Peter; Almer, Jonathan; Xu, Chi; Stubbins, James F.

doi:10.1016/j.actamat.2016.12.038

Title: In situ high-energy X-ray diffraction study of tensile deformation of neutron-irradiated polycrystalline Fe-9%Cr alloy

Journal Article · Fri Dec 30 00:00:00 EST 2016 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2016.12.038· OSTI ID:1339442

^[1]; Li, Meimei ^[1]; Park, Jun -Sang ^[1]; Kenesei, Peter ^[1]; Almer, Jonathan ^[1]; Xu, Chi ^[2]; Stubbins, James F. ^[3]

Argonne National Lab. (ANL), Lemont, IL (United States)
Univ. of Florida, Gainesville, FL (United States)
Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)

The effect of neutron irradiation on tensile deformation of a Fe-9wt.%Cr alloy was investigated using in situ high-energy synchrotron X-ray diffraction during room-temperature uniaxial tensile tests. New insights into the deformation mechanisms were obtained through the measurements of lattice strain evolution and the analysis of diffraction peak broadening using the modified Williamson-Hall method. Two neutron-irradiated specimens, one irradiated at 300 °C to 0.01 dpa and the other at 450 °C to 0.01dpa, were tested along with an unirradiated specimen. The macroscopic stress–strain curves of the irradiated specimens showed increased strength, reduced ductility and work-hardening exponent compared to the unirradiated specimen. The evolutions of the lattice strain, the dislocation density and the coherent scattering domain size in the deformation process revealed different roles of the submicroscopic defects in the 300°C/0.01 dpa specimen and the TEM-visible nanometer-sized dislocation loops in the 450°C/0.01 dpa specimen: submicroscopic defects extended the linear work hardening stage (stage II) to a higher strain, while irradiation-induced dislocation loops were more effective in dislocation pinning. Lastly, while the work hardening rate of stage II was unaffected by irradiation, significant dynamic recovery in stage III in the irradiated specimens led to the early onset of necking without stage IV as observed in the unirradiated specimen.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE). Nuclear Energy Enabling Technologies (NEET)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1339442

Alternate ID(s):: OSTI ID: 1397787

Journal Information:: Acta Materialia, Vol. 126, Issue C; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 33 works

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