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Title: The influence of impurities on the crystal structure and mechanical properties of additive manufactured U–14at.% Nb

Uranium-niobium alloys can exist with significantly different microstructures and mechanical properties, heavily influenced by thermomechanical processing history and impurities. In this study, the influence of Ti and other impurities is studied on uranium-14 at.% niobium additively manufactured using laser powder bed fusion. In two different metallic impurity levels were investigated and a Nb equivalent (Nbeq) composition is defined to represent the impurities. Furthermore, in-situ neutron diffraction during compression loading shows that increased Nbeq promotes the formation of γ°-tetragonal phase at the expense of α''-monoclinic phase, resulting in 2 × higher yield strength than water quenched α'' and a strain induced transformation to α'' with superelastic strains to 4.5%.
Authors:
 [1] ;  [2] ;  [2] ;  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Materials Engineering Division
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Materials Science and Technology Division
Publication Date:
Report Number(s):
LLNL-JRNL-696808
Journal ID: ISSN 1359-6462
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Scripta Materialia
Additional Journal Information:
Journal Volume: 130; Journal Issue: C; Journal ID: ISSN 1359-6462
Publisher:
Elsevier
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Additive manufacturing; Laser powder processing; Neutron diffraction; Superelasticity; Martensitic phase transformations
OSTI Identifier:
1337003
Alternate Identifier(s):
OSTI ID: 1398044