Frank A. Garner
Texas A&M University
IrradiationAnalytical chemistryNuclear chemistryIonNeutronComposite materialMetallurgyMaterials scienceSwellingAlloyGrain boundaryHeliumNucleationVoid (astronomy)MicrostructureAustenite
Publications 125
#1Vladimir Krsjak (ITI: Information Technology Institute)H-Index: 1
#2Tielong Shen (CAS: Chinese Academy of Sciences)H-Index: 11
Last. Frank A. Garner (A&M: Texas A&M University)H-Index: 20
view all 10 authors...
Abstract null null The development of structural materials resistant to harsh radiation environments requires an in-depth understanding of the early stage of the ageing processes. In radiation environments with high transmutation helium production rates such as in fusion and spallation applications, even materials with otherwise acceptable radiation stability may suffer from radiation embrittlement related to helium bubble formation. While theoretical modelling of helium-assisted cavity nucleati...
#6Cheng Sun (INL: Idaho National Laboratory)H-Index: 20
Abstract This article investigates the integrity of laser welds on neutron irradiated, He-containing steel. Life extension of the current fleet of light water reactors could necessitate repair of cracks on irreplaceable internal components, but heat input of weld repairs exacerbates the problem by initiating He-induced cracking. Laser welding is a promising low-heat-input technology thought to limit the extent of He-induced cracking. In this study, we produce laser welds in a hot cell on AISI 30...
#1Nouf Almousa (MIT: Massachusetts Institute of Technology)H-Index: 5
#2Benjamin Dacus (MIT: Massachusetts Institute of Technology)H-Index: 2
Last. Michael P. Short (MIT: Massachusetts Institute of Technology)H-Index: 19
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Abstract Transient grating spectroscopy (TGS), a non-contact ultrasonic materials analysis technique, is proposed to rapidly and indirectly assess relative void swelling resistance of multiple structural materials. Statistically significant changes in the frequency of probed surface acoustic waves (SAWs) suggest that newly developed steels containing nanosized precipitates show higher resistance to void swelling when compared to their simpler, commercial analogues. The higher reduction in SAW fr...
#1Tianyao Wang (A&M: Texas A&M University)H-Index: 6
#2Hyosim Kim (LANL: Los Alamos National Laboratory)H-Index: 9
Last. Lin Shao (A&M: Texas A&M University)H-Index: 52
view all 6 authors...
Abstract The microstructural evolution and helium retention in polycrystalline tungsten (W) implanted with 100 keV helium ions at different temperatures to a wide range of different fluences were studied. Rutherford backscattering spectrometry (RBS) shows that helium atoms were well retained in tungsten, and no loss of helium occurred before surface blistering/flaking occurred. Within certain windows of fluence and temperature, ordered bubble superlattices form. A minimum fluence and sufficientl...
#1Jing Wang (PNNL: Pacific Northwest National Laboratory)H-Index: 14
#2Mychailo B. Toloczko (PNNL: Pacific Northwest National Laboratory)H-Index: 24
Last. Lin Shao (A&M: Texas A&M University)H-Index: 52
view all 9 authors...
Abstract Because the microstructure of oxide dispersion strengthened (ODS) alloys largely determines its mechanical properties in nuclear reactors, it is critical to understand the irradiation response of microstructure after high-dose radiation damage for safety and performance concerns. This paper presents a comprehensive characterization of microstructural responses to ion irradiation of the ODS ferritic alloy MA957 using atom probe tomography and compares the observations to current theories...
#1Jin-Yeon Kim (Georgia Institute of Technology)H-Index: 35
#2James J. Wall (Georgia Institute of Technology)H-Index: 15
Last. Laurence J. Jacobs (Georgia Institute of Technology)H-Index: 47
view all 4 authors...
Abstract This research combines linear and nonlinear ultrasound to examine the microstructural and microchemical changes in five large, highly irradiated cold-worked ANSI 304 stainless steel coin specimens cut from two hexagonal cross section blocks with radiation damage levels ranging from ~0.4 to ~33 dpa following irradiation in the EBR-II fast reactor. Both linear (velocity) and nonlinear ultrasonic (β) measurements were conducted in a hot cell using an automated fixture device specially desi...
#1Hyosim KimH-Index: 9
#2Jonathan Gigax (LANL: Los Alamos National Laboratory)H-Index: 17
Last. Lin ShaoH-Index: 52
view all 5 authors...
Abstract Ferritic-martensitic oxide-dispersion-strengthened (ODS) alloy has shown excellent mechanical property and high radiation tolerance. However, the stability of dispersoids during displacive irradiation in the individual ferritic and martensitic phases is unclear. Here, the correlation among dispersoid coherency, size, density, and matrix phase are studied in dual-phase 12Cr ODS after 100 peak displacements-per-atom (dpa) irradiation at 475°C, using 3.5 MeV Fe2+ self-ions. The size and de...
#2Cheng Sun (INL: Idaho National Laboratory)H-Index: 20
Abstract The role of cavities on deformation-induced martensitic phase transformations is studied in a laser-welded and neutron irradiated austenitic stainless steel. Orientation dependent nanoindentation experiments are performed in the base metal and the weld heat affected zone (HAZ) at room temperature. Transmission electron microscopy study of deformed microstructures indicates indentation-induced α’-martensite forms in the base metal, whereas α’- and e-martensite arise in the HAZ. The diffe...
#1Xiang Liu (UIUC: University of Illinois at Urbana–Champaign)H-Index: 14
#2Jonathan Gigax (A&M: Texas A&M University)H-Index: 17
Last. James F. Stubbins (UIUC: University of Illinois at Urbana–Champaign)H-Index: 29
view all 8 authors...
Abstract The radiation response of a Fe–20Cr–25Ni austenitic stainless steel under self-ion irradiation at 500°C was systematically investigated. The steel was irradiated at 500°C by 3.5 MeV Fe2+ ions to 10, 50, and 150 peak dpa, respectively. In the 200–400 nm depth region, radiation-induced Frank loops were relatively stable in both size and number density from 10 to 150 peak dpa. Anisotropic distribution of Frank loops was observed in the 50 and 150 peak dpa specimens, possibly due to interac...
#1Frank A. GarnerH-Index: 20
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