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Title: Unraveling cyclic deformation mechanisms of a rolled magnesium alloy using in situ neutron diffraction

Abstract

In the current study, the deformation mechanisms of a rolled magnesium alloy were investigated under cyclic loading using real-time in situ neutron diffraction under a continuous-loading condition. The relationship between the macroscopic cyclic deformation behavior and the microscopic response at the grain level was established. The neutron diffraction results indicate that more and more grains are involved in the twinning and detwinning deformation process with the increase of fatigue cycles. The residual twins appear in the early fatigue life, which is responsible for the cyclic hardening behavior. The asymmetric shape of the hysteresis loop is attributed to the early exhaustion of the detwinning process during compression, which leads to the activation of dislocation slips and rapid strain-hardening. The critical resolved shear stress for the activation of tensile twinning closely depends on the residual strain developed during cyclic loading. In the cycle before the sample fractured, the dislocation slips became active in tension, although the sample was not fully twinned. The increased dislocation density leads to the rise of the stress concentration at weak spots, which is believed to be the main reason for the fatigue failure. Furthermore, the deformation history greatly influences the deformation mechanisms of hexagonal-close-packed-structured magnesium alloy duringmore » cyclic loading.« less

Authors:
 [1];  [1];  [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1185511
Alternate Identifier(s):
OSTI ID: 1259928
Grant/Contract Number:  
AC05-00OR22725; FE-0008855; FE-001194
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 85; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; magnesium alloy; cyclic loading; deformation mechanisms; neutron diffraction; twinning

Citation Formats

Wu, Wei, An, Ke, and Liaw, Peter K. Unraveling cyclic deformation mechanisms of a rolled magnesium alloy using in situ neutron diffraction. United States: N. p., 2014. Web. https://doi.org/10.1016/j.actamat.2014.11.030.
Wu, Wei, An, Ke, & Liaw, Peter K. Unraveling cyclic deformation mechanisms of a rolled magnesium alloy using in situ neutron diffraction. United States. https://doi.org/10.1016/j.actamat.2014.11.030
Wu, Wei, An, Ke, and Liaw, Peter K. Tue . "Unraveling cyclic deformation mechanisms of a rolled magnesium alloy using in situ neutron diffraction". United States. https://doi.org/10.1016/j.actamat.2014.11.030. https://www.osti.gov/servlets/purl/1185511.
@article{osti_1185511,
title = {Unraveling cyclic deformation mechanisms of a rolled magnesium alloy using in situ neutron diffraction},
author = {Wu, Wei and An, Ke and Liaw, Peter K.},
abstractNote = {In the current study, the deformation mechanisms of a rolled magnesium alloy were investigated under cyclic loading using real-time in situ neutron diffraction under a continuous-loading condition. The relationship between the macroscopic cyclic deformation behavior and the microscopic response at the grain level was established. The neutron diffraction results indicate that more and more grains are involved in the twinning and detwinning deformation process with the increase of fatigue cycles. The residual twins appear in the early fatigue life, which is responsible for the cyclic hardening behavior. The asymmetric shape of the hysteresis loop is attributed to the early exhaustion of the detwinning process during compression, which leads to the activation of dislocation slips and rapid strain-hardening. The critical resolved shear stress for the activation of tensile twinning closely depends on the residual strain developed during cyclic loading. In the cycle before the sample fractured, the dislocation slips became active in tension, although the sample was not fully twinned. The increased dislocation density leads to the rise of the stress concentration at weak spots, which is believed to be the main reason for the fatigue failure. Furthermore, the deformation history greatly influences the deformation mechanisms of hexagonal-close-packed-structured magnesium alloy during cyclic loading.},
doi = {10.1016/j.actamat.2014.11.030},
journal = {Acta Materialia},
number = ,
volume = 85,
place = {United States},
year = {2014},
month = {12}
}

Journal Article:

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Cited by: 11 works
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    Works referencing / citing this record:

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