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

Abstract

Real-time in-situ neutron diffraction was conducted during uniaxial cycling compression of a Ni49.3Fe18Ga27Co5.7 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.

Authors:
 [1];  [2];  [3];  [4];  [5];  [3]
+ Show Author Affiliations
  1. Northeastern Univ., Shenyang (China); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Tianjin Univ., Tianjin (China)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Northeastern Univ., Shenyang (China)
  5. Northeastern Univ., Shenyang (China); Univ. of Science and Technology Beijing, Beijing (China)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1334480
Alternate Identifier(s):
OSTI ID: 1417104
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing
Additional Journal Information:
Journal Volume: 680; Journal Issue: C; Journal ID: ISSN 0921-5093
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ferromagnetic shape memory alloy; Ni-Fe-Ga-Co; superelasticity; neutron diffraction; stress-induced martensitic transformation

Citation Formats

Yang, Hui, Yu, Dunji, Chen, Yan, Mu, Juan, Wang, Y. D., and An, Ke. In-situ TOF neutron diffraction studies of cyclic softening in superelasticity of a NiFeGaCo shape memory alloy. United States: N. p., 2016. Web. doi:10.1016/j.msea.2016.10.078.
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Yang, Hui, Yu, Dunji, Chen, Yan, Mu, Juan, Wang, Y. D., & An, Ke. In-situ TOF neutron diffraction studies of cyclic softening in superelasticity of a NiFeGaCo shape memory alloy. United States. https://doi.org/10.1016/j.msea.2016.10.078
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Yang, Hui, Yu, Dunji, Chen, Yan, Mu, Juan, Wang, Y. D., and An, Ke. Mon . "In-situ TOF neutron diffraction studies of cyclic softening in superelasticity of a NiFeGaCo shape memory alloy". United States. https://doi.org/10.1016/j.msea.2016.10.078. https://www.osti.gov/servlets/purl/1334480.
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@article{osti_1334480,
title = {In-situ TOF neutron diffraction studies of cyclic softening in superelasticity of a NiFeGaCo shape memory alloy},
author = {Yang, Hui and Yu, Dunji and Chen, Yan and Mu, Juan and Wang, Y. D. and An, Ke},
abstractNote = {Real-time in-situ neutron diffraction was conducted during uniaxial cycling compression of a Ni49.3Fe18Ga27Co5.7 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.},
doi = {10.1016/j.msea.2016.10.078},
journal = {Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing},
number = C,
volume = 680,
place = {United States},
year = {Mon Oct 24 00:00:00 EDT 2016},
month = {Mon Oct 24 00:00:00 EDT 2016}
}
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Journal Article:
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https://doi.org/10.1016/j.msea.2016.10.078
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Works referenced in this record:

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journal, October 2002

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    A suite-level review of the neutron powder diffraction instruments at Oak Ridge National Laboratory
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    • Calder, S.; An, K.; Boehler, R.
    • Review of Scientific Instruments, Vol. 89, Issue 9
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