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Title: Linking the Codependence of Grain Boundary Structure and Density to Defect Evolution Mechanisms during Radiation Damage

Abstract

There is little understanding of the direct link between grain boundary character and density, and defect denuded zones. For example, the role of reduced grain size to the nanocrystalline regime and subsequent increase in grain boundary density is not fully understood in the context of dislocation or void behavior near grain boundaries. In addition, little is understood experimentally on how defect absorption changes the structure of the grain boundary during irradiation and may play a role in the migration of defects and solutes. This work aims to define a framework for understanding the origin of radiation damage mechanisms in model BCC and FCC nanocrystalline materials, on which a foundation of radiation tolerant material development can be built. The key questions that will be addressed by this work are: 1. What is the influence of GB density and GB character (GBC) on radiation damage accumulation near grain boundaries in model nanocrystalline FCC and BCC alloys; how are these two effects connected? 2. In the context of radiation induced segregation (RIS), what effect does species dependent interstitial diffusion have on the GB chemistry in light of these two dependencies? 3. How does grain boundary sink efficiency evolve with radiation over time? Inmore » situ and analytical transmission electron microscopy techniques are used to study both pure and alloy nanocrystalline materials under irradiation. TEM samples prepared from thin films will be irradiated in-situ, allowing for dynamic observation of the behavior of the alloy under ion irradiation. The key findings from this program were (1) the control of thin film texture via sputtering; (2) the development of characterization tools for defects and grain boundary quantification; (3) the development of new techniques for defect characterization toward high throughput analysis; (4) a mapped out parameter space for defect evolution as a function of grain size and grain boundary character; and finally (5) an indication of sink efficiency and its stability during irradiation.« less

Authors:
Publication Date:
Research Org.:
Drexel Univ., Philadelphia, PA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Contributing Org.:
Drexel University (Main); Los Alamos National Laboratory, Argonne National Laboratory, Sandia National Laboratories (collaborating)
OSTI Identifier:
1547399
Report Number(s):
DE-SC0008274
DOE Contract Number:  
SC0008274
Resource Type:
Technical Report
Resource Relation:
Related Information: Report (pdf) is attached on next page, outlining publications and key results.
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Grain boundary, radiation, nanocrystalline, defect

Citation Formats

Taheri, Mitra L. Linking the Codependence of Grain Boundary Structure and Density to Defect Evolution Mechanisms during Radiation Damage. United States: N. p., 2019. Web. doi:10.2172/1547399.
Taheri, Mitra L. Linking the Codependence of Grain Boundary Structure and Density to Defect Evolution Mechanisms during Radiation Damage. United States. doi:10.2172/1547399.
Taheri, Mitra L. Thu . "Linking the Codependence of Grain Boundary Structure and Density to Defect Evolution Mechanisms during Radiation Damage". United States. doi:10.2172/1547399. https://www.osti.gov/servlets/purl/1547399.
@article{osti_1547399,
title = {Linking the Codependence of Grain Boundary Structure and Density to Defect Evolution Mechanisms during Radiation Damage},
author = {Taheri, Mitra L},
abstractNote = {There is little understanding of the direct link between grain boundary character and density, and defect denuded zones. For example, the role of reduced grain size to the nanocrystalline regime and subsequent increase in grain boundary density is not fully understood in the context of dislocation or void behavior near grain boundaries. In addition, little is understood experimentally on how defect absorption changes the structure of the grain boundary during irradiation and may play a role in the migration of defects and solutes. This work aims to define a framework for understanding the origin of radiation damage mechanisms in model BCC and FCC nanocrystalline materials, on which a foundation of radiation tolerant material development can be built. The key questions that will be addressed by this work are: 1. What is the influence of GB density and GB character (GBC) on radiation damage accumulation near grain boundaries in model nanocrystalline FCC and BCC alloys; how are these two effects connected? 2. In the context of radiation induced segregation (RIS), what effect does species dependent interstitial diffusion have on the GB chemistry in light of these two dependencies? 3. How does grain boundary sink efficiency evolve with radiation over time? In situ and analytical transmission electron microscopy techniques are used to study both pure and alloy nanocrystalline materials under irradiation. TEM samples prepared from thin films will be irradiated in-situ, allowing for dynamic observation of the behavior of the alloy under ion irradiation. The key findings from this program were (1) the control of thin film texture via sputtering; (2) the development of characterization tools for defects and grain boundary quantification; (3) the development of new techniques for defect characterization toward high throughput analysis; (4) a mapped out parameter space for defect evolution as a function of grain size and grain boundary character; and finally (5) an indication of sink efficiency and its stability during irradiation.},
doi = {10.2172/1547399},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {8}
}