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Title: Load partitioning between the bcc-iron matrix and NiAl-type precipitates in a ferritic alloy on multiple length scales

An understanding of load sharing among constituent phases aids in designing mechanical properties of multiphase materials. Here we investigate load partitioning between the body-centered-cubic iron matrix and NiAl-type precipitates in a ferritic alloy during uniaxial tensile tests at 364 and 506 C on multiple length scales by in situ neutron diffraction and crystal plasticity finite element modeling. Our findings show that the macroscopic load-transfer efficiency is not as high as that predicted by the Eshelby model; moreover, it depends on the matrix strain-hardening behavior. We explain the grain-level anisotropic load-partitioning behavior by considering the plastic anisotropy of the matrix and elastic anisotropy of precipitates. We further demonstrate that the partitioned load on NiAl-type precipitates relaxes at 506 C, most likely through thermally-activated dislocation rearrangement on the microscopic scale. Furthermore, the study contributes to further understanding of load-partitioning characteristics in multiphase materials.
Authors:
 [1] ;  [1] ;  [2] ;  [2] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-15-21360
Journal ID: ISSN 2045-2322
Grant/Contract Number:
AC05-00OR22725; AC52-06NA25396; 09NT0008089; FE0005868; FE0011194; FE0024054
Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 6; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; composites; mechanical properties; metals and alloys; Neutron Diffraction
OSTI Identifier:
1250417
Alternate Identifier(s):
OSTI ID: 1304706

Sun, Zhiqian, Song, Gian, Sisneros, Thomas A., Clausen, Bjorn, Pu, Chao, Li, Lin, Gao, Yanfei, and Liaw, Peter K.. Load partitioning between the bcc-iron matrix and NiAl-type precipitates in a ferritic alloy on multiple length scales. United States: N. p., Web. doi:10.1038/srep23137.
Sun, Zhiqian, Song, Gian, Sisneros, Thomas A., Clausen, Bjorn, Pu, Chao, Li, Lin, Gao, Yanfei, & Liaw, Peter K.. Load partitioning between the bcc-iron matrix and NiAl-type precipitates in a ferritic alloy on multiple length scales. United States. doi:10.1038/srep23137.
Sun, Zhiqian, Song, Gian, Sisneros, Thomas A., Clausen, Bjorn, Pu, Chao, Li, Lin, Gao, Yanfei, and Liaw, Peter K.. 2016. "Load partitioning between the bcc-iron matrix and NiAl-type precipitates in a ferritic alloy on multiple length scales". United States. doi:10.1038/srep23137. https://www.osti.gov/servlets/purl/1250417.
@article{osti_1250417,
title = {Load partitioning between the bcc-iron matrix and NiAl-type precipitates in a ferritic alloy on multiple length scales},
author = {Sun, Zhiqian and Song, Gian and Sisneros, Thomas A. and Clausen, Bjorn and Pu, Chao and Li, Lin and Gao, Yanfei and Liaw, Peter K.},
abstractNote = {An understanding of load sharing among constituent phases aids in designing mechanical properties of multiphase materials. Here we investigate load partitioning between the body-centered-cubic iron matrix and NiAl-type precipitates in a ferritic alloy during uniaxial tensile tests at 364 and 506 C on multiple length scales by in situ neutron diffraction and crystal plasticity finite element modeling. Our findings show that the macroscopic load-transfer efficiency is not as high as that predicted by the Eshelby model; moreover, it depends on the matrix strain-hardening behavior. We explain the grain-level anisotropic load-partitioning behavior by considering the plastic anisotropy of the matrix and elastic anisotropy of precipitates. We further demonstrate that the partitioned load on NiAl-type precipitates relaxes at 506 C, most likely through thermally-activated dislocation rearrangement on the microscopic scale. Furthermore, the study contributes to further understanding of load-partitioning characteristics in multiphase materials.},
doi = {10.1038/srep23137},
journal = {Scientific Reports},
number = ,
volume = 6,
place = {United States},
year = {2016},
month = {3}
}