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Title: Grain boundary complexions in multicomponent alloys: Challenges and opportunities

Authors:
; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1398685
Grant/Contract Number:
FE0011291; N00014-15-1-0030
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Current Opinion in Solid State and Materials Science
Additional Journal Information:
Journal Volume: 20; Journal Issue: 5; Related Information: CHORUS Timestamp: 2017-10-08 21:25:52; Journal ID: ISSN 1359-0286
Publisher:
Elsevier
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Zhou, Naixie, Hu, Tao, and Luo, Jian. Grain boundary complexions in multicomponent alloys: Challenges and opportunities. United Kingdom: N. p., 2016. Web. doi:10.1016/j.cossms.2016.05.001.
Zhou, Naixie, Hu, Tao, & Luo, Jian. Grain boundary complexions in multicomponent alloys: Challenges and opportunities. United Kingdom. doi:10.1016/j.cossms.2016.05.001.
Zhou, Naixie, Hu, Tao, and Luo, Jian. Sat . "Grain boundary complexions in multicomponent alloys: Challenges and opportunities". United Kingdom. doi:10.1016/j.cossms.2016.05.001.
@article{osti_1398685,
title = {Grain boundary complexions in multicomponent alloys: Challenges and opportunities},
author = {Zhou, Naixie and Hu, Tao and Luo, Jian},
abstractNote = {},
doi = {10.1016/j.cossms.2016.05.001},
journal = {Current Opinion in Solid State and Materials Science},
number = 5,
volume = 20,
place = {United Kingdom},
year = {Sat Oct 01 00:00:00 EDT 2016},
month = {Sat Oct 01 00:00:00 EDT 2016}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.cossms.2016.05.001

Citation Metrics:
Cited by: 3works
Citation information provided by
Web of Science

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  • Here, we demonstrate here that locally stabilized structure and compositional segregation at grain boundaries in a complex multicomponent alloy can be modified using high temperature homogenization treatment to influence the kinetics of phase transformations initiating from grain boundaries during subsequent low temperature annealing. Using aberration-corrected scanning transmission electron microscopy and atom probe tomography of a model multicomponent metallic alloy —uranium-10 wt% molybdenum (U-10Mo) a nuclear fuel, that is highly relevant to worldwide nuclear non-proliferation efforts, we demonstrate the ability to change the structure and compositional segregation at grain boundary, which then controls the subsequent discontinuous precipitation kinetics during sub-eutectoid annealing.more » A change in grain boundary from one characterized by segregation of Mo and impurities at grain boundary to a phase boundary with a distinct U 2MoSi 2C wetting phase precipitates introducing Ni and Al rich interphase complexions caused a pronounced reduction in area fraction of subsequent discontinuous precipitation. The broader implication of this work is in highlighting the role of grain boundary structure and composition in metallic alloys on dictating the fate of grain boundary initiated phase transformations like discontinuous precipitation or cellular transformation. This work highlights a new pathway to tune the grain boundary structure and composition to tailor the final microstructure of multicomponent metallic alloys.« less
  • Grain boundaries in metallic alloys often play a crucial role, not only in determining the mechanical properties or thermal stability of alloys, but also in dictating the phase transformation kinetics during thermomechanical processing. We demonstrate that locally stabilized structure and compositional segregation at grain boundaries—“grain boundary complexions”—in a complex multicomponent alloy can be modified to influence the kinetics of cellular transformation during subsequent thermomechanical processing. Using aberration-corrected scanning transmission electron microscopy and atom probe tomography analysis of a metallic nuclear fuel highly relevant to worldwide nuclear non-proliferation efforts —uranium-10 wt% molybdenum (U-10Mo) alloy, new evidence for the existence of grainmore » boundary complexion is provided. We then modified the concentration of impurities dissolved in Υ-UMo grain interiors and/or segregated to Υ-UMo grain boundaries by changing the homogenization treatment, and these effects were used used to retard the kinetics of cellular transformation during subsequent sub-eutectoid annealing in this U-10-Mo alloy during sub-eutectoid annealing. Thus, this work provided insights on tailoring the final microstructure of the U-10Mo alloy, which can potentially improve the irradiation performance of this important class of alloy fuels.« less