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

Wu, Wei; An, Ke; Liaw, Peter K.

doi:10.1016/j.actamat.2014.11.030

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

Journal Article · Tue Dec 23 00:00:00 EST 2014 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2014.11.030· OSTI ID:1185511

Wu, Wei ^[1]; An, Ke ^[1]; Liaw, Peter K. ^[2]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: ORNL LDRD Director's R&D; USDOE; USDOE Office of Fossil Energy and Carbon Management (FECM); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; FE0008855

OSTI ID:: 1185511

Alternate ID(s):: OSTI ID: 22411575
OSTI ID: 1259928

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Vol. 85; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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