In-situ TOF neutron diffraction studies of cyclic softening in superelasticity of a NiFeGaCo shape memory alloy

Yang, Hui; Yu, Dunji; Chen, Yan; Mu, Juan; Wang, Y. D.; An, Ke

doi:10.1016/j.msea.2016.10.078

In-situ TOF neutron diffraction studies of cyclic softening in superelasticity of a NiFeGaCo shape memory alloy

Journal Article · Mon Oct 24 00:00:00 EDT 2016 · Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

DOI:https://doi.org/10.1016/j.msea.2016.10.078· OSTI ID:1334480

Yang, Hui ^[1]; Yu, Dunji ^[2]; Chen, Yan ^[3]; Mu, Juan ^[4]; Wang, Y. D. ^[5]; An, Ke ^[3]

Northeastern Univ., Shenyang (China); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Tianjin Univ., Tianjin (China)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Northeastern Univ., Shenyang (China)
Northeastern Univ., Shenyang (China); Univ. of Science and Technology Beijing, Beijing (China)

Real-time in-situ neutron diffraction was conducted during uniaxial cycling compression of a Ni_49.3Fe₁₈Ga₂₇Co_5.7 shape memory alloy to explore the mechanism on its superelasticity at room temperature, which was manifested by the almost recoverable large strains and the apparent cyclic softening. Based on the Rietveld refinements, the real-time evolution of volume fraction of martensite was in-situ monitored, indicating the incremental amount of residual martensite with increasing load cycles. Real-time changes in intensities and lattice strains of {hkl} reflections for individual phase were obtained through fitting individual peaks, which reveal the quantitative information on phase transformation kinetics as a function of grain orientation and stress/strain partitioning. Moreover, a large compressive residual stress was evidenced in the parent phase, which should be balanced by the residual martensite after the second unloading cycle. As a result, the large compressive residual stress found in the parent austenite phase may account for the cyclic effect on critical stress required for triggering the martensitic transformation in the subsequent loading.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1334480

Alternate ID(s):: OSTI ID: 1417104

Journal Information:: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing, Journal Name: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing Journal Issue: C Vol. 680; ISSN 0921-5093

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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