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

Sun, Zhiqian; Song, Gian; Sisneros, Thomas A.; Clausen, Bjorn; Pu, Chao; Li, Lin; Gao, Yanfei; Liaw, Peter K.

doi:10.1038/srep23137

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

Journal Article · Wed Mar 16 00:00:00 EDT 2016 · Scientific Reports

DOI:https://doi.org/10.1038/srep23137· OSTI ID:1250417

Sun, Zhiqian ^[1]; Song, Gian ^[1]; Sisneros, Thomas A. ^[2]; Clausen, Bjorn ^[2]; Pu, Chao ^[1]; Li, Lin ^[1]; Gao, Yanfei ^[1]; Liaw, Peter K. ^[1]

Univ. of Tennessee, Knoxville, TN (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Our understanding of load sharing among constituent phases aids us in designing mechanical properties of multiphase materials. 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 also 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. Finally, this study contributes to further understanding of load-partitioning characteristics in multiphase materials.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; AC52-06NA25396; 09NT0008089; FE0005868; FE0011194; FE0024054

OSTI ID:: 1250417

Alternate ID(s):: OSTI ID: 1304706

Report Number(s):: LA-UR-15-21360

Journal Information:: Scientific Reports, Vol. 6; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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