institute for materials science - los alamos national ......is par&cularly interested in the...

UNCLASSIFIED IMS Rapid Response 2017 * Recipient Guest Seminar Dr. Levente Balogh Canadian Nuclear Laboratories (CNL) Quantifying irradiation defects in Zr alloys: A comparison between transmission electron microscopy & diffracEon line profile analysis Thursday, April 20, 2017 1:30 - 2:30 MSL Auditorium (TA-03 - Bldg 1698 - Room A103) Abstract: Irradia&on induced disloca&ons significantly affect the mechanical proper&es of Zr alloys, altering slip and influencing creep and growth. Thus, the quan&ta&ve characterisa&on of irradia&on defects, as a func&on of fluence, cold- work and/or thermal treatments is important for models that aBempt to predict their impact on proper&es. Whole paBern diffrac&on line profile analysis (DLPA) is a modern tool for microstructure characteriza&on based on first-principle physical models, well-established for disloca&on density measurements in plas&cally deformed materials. However applying these DLPA methods directly to irradiated materials yields higher than expected disloca&on density values in comparison to historical TEM measurements, and to past line broadening analysis studies calibrated to TEM observa&ons. In an effort to understand these differences, a new microstructural model was developed for DLPA to specifically address disloca&on structures consis&ng of ellip&cal <a> and <c>-component loops. To compare the refined DLPA method with TEM measurements, high resolu&on neutron diffrac&on paBerns on the unirradiated and irradiated Zr-2.5Nb samples were collected with the Neutron Powder Diffractometer (NPDF) instrument at the Los Alamos Neutron Science Center (LANSCE), and were evaluated. High resolu&on TEM measurements were performed at the Reactor Materials Tes&ng Laboratory (RMTL), Queen’s University, for comparison to the DLPA results. The capabili&es of both methods will be compared in detail. The main sources of uncertain&es will be discussed, such as the accuracy of the loop diameter measurements and the presence of residual intergranular strains in the case of TEM and DLPA, respec&vely. It will be shown that the differences between the density values provided by DLPA and TEM are inherent to the methods and can be reconciled with the interpreta&on of the data. Bio: Dr. Balogh is a Research Scien&st at the Radia&on Damage and Deforma&on Branch at the Canadian Nuclear Laboratories (CNL) in Chalk River, ON, Canada. He received a Ph.D. in Physics (Materials and Solid State Physics) from Eötvös Loránd University, Budapest, Hungary, and con&nued as a postdoctoral fellow at the Los Alamos Na&onal Laboratory and Queen’s University, Kingston, ON, Canada. His exper&se lies in applying and developing advanced X- ray/synchrotron and neutron diffrac&on based techniques to characterize the structure and microstructure of materials. He is par&cularly interested in the characteriza&on and quan&fica&on of lacce defect popula&ons using diffrac&on techniques with focus on radia&on induced damage in nuclear structural materials, such as Zr-alloys and steels. UNCLASSIFIED - OPEN TO ALL LANL EMPLOYEES Hosted by Don Brown * MST-8 Sponsored by the Institute for Materials Science To be on Dr. Balogh's Agenda, to par&cipate in the Early Career Lunch, or for general informa&on contact: Don Brown [email protected] * 667-7904 Institute for Materials Science

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Page 1: Institute for Materials Science - Los Alamos National ......is par&cularly interested in the characteriza&on and quan&ﬁca&on of lacce defect popula&ons using diﬀrac&on techniques

UNCLASSIFIED

IMSRapidResponse2017*RecipientGuestSeminar

Dr. Levente BaloghCanadianNuclearLaboratories(CNL)

Quantifying irradiation defects in Zr alloys:Acomparisonbetweentransmissionelectronmicroscopy&diffracEonlineprofileanalysis

Thursday,April20,20171:30-2:30MSLAuditorium(TA-03-Bldg1698-RoomA103)

Abstract: Irradia&on induced disloca&ons significantly affect the mechanical proper&es of Zr alloys, altering slip andinfluencing creep and growth. Thus, the quan&ta&ve characterisa&on of irradia&on defects, as a func&on of fluence, cold-work and/or thermal treatments is important for models that aBempt to predict their impact on proper&es. Whole paBerndiffrac&on line profile analysis (DLPA) is a modern tool for microstructure characteriza&on based on first-principle physicalmodels, well-established for disloca&on density measurements in plas&cally deformed materials. However applying theseDLPA methods directly to irradiated materials yields higher than expected disloca&on density values in comparison tohistorical TEM measurements, and to past line broadening analysis studies calibrated to TEM observa&ons. In an effort tounderstand these differences, a new microstructural model was developed for DLPA to specifically address disloca&onstructures consis&ng of ellip&cal <a> and <c>-component loops. To compare the refined DLPA method with TEMmeasurements, high resolu&on neutron diffrac&on paBerns on the unirradiated and irradiated Zr-2.5Nb samples werecollected with the Neutron Powder Diffractometer (NPDF) instrument at the Los Alamos Neutron Science Center (LANSCE),and were evaluated. High resolu&on TEM measurements were performed at the Reactor Materials Tes&ng Laboratory(RMTL), Queen’s University, for comparison to the DLPA results. The capabili&es of both methods will be compared indetail. The main sources of uncertain&es will be discussed, such as the accuracy of the loop diameter measurements andthe presence of residual intergranular strains in the case of TEM and DLPA, respec&vely. It will be shown that thedifferences between the density values provided by DLPA and TEM are inherent to the methods and can be reconciled withtheinterpreta&onofthedata.

Bio: Dr. Balogh is a Research Scien&st at the Radia&on Damage and Deforma&on Branch at the Canadian NuclearLaboratories (CNL) in Chalk River, ON, Canada. He received a Ph.D. in Physics (Materials and Solid State Physics) fromEötvös Loránd University, Budapest, Hungary, and con&nued as a postdoctoral fellow at the Los Alamos Na&onalLaboratory and Queen’s University, Kingston, ON, Canada. His exper&se lies in applying and developing advanced X-ray/synchrotron and neutron diffrac&on based techniques to characterize the structure and microstructure of materials. Heis par&cularly interested in the characteriza&on and quan&fica&on of lacce defect popula&ons using diffrac&on techniqueswithfocusonradia&oninduceddamageinnuclearstructuralmaterials,suchasZr-alloysandsteels.

UNCLASSIFIED - OPEN TO ALL LANL EMPLOYEES

HostedbyDonBrown*MST-8

Sponsored by the Institute for Materials Science

TobeonDr.Balogh'sAgenda,topar&cipateintheEarlyCareerLunch,orforgeneralinforma&oncontact:DonBrown

[email protected]*667-7904

Institute for Materials Science

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