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Title: Superelasticity by reversible variant reorientation in a Ni-Mn-Ga microwire with bamboo grains

Abstract

The link between microstructure and mechanical properties is investigated for a superelastic Ni–Mn–Ga microwire with 226 μm diameter, created by solidification via the Taylor method. The wire, which consists of bamboo grains with tetragonal martensite matrix and coarse γ precipitates, exhibits fully reversible superelastic behavior up to 4% tensile strain. Upon multiple tensile load–unload cycles, reproducible stress fluctuations of ~3 MPa are measured on the loading superelastic stress plateau of ~50 MPa. During cycles at various temperatures spanning -70 to 55 °C, the plateau stress decreases from 58 to 48 MPa near linearly with increasing temperature. Based on in situ synchrotron X-ray diffraction measurements, we conclude that this superelastic behavior is due to reversible martensite variants reorientation (i.e., reversible twinning) with lattice rotation of ~13°. The reproducible stress plateau fluctuations are assigned to reversible twinning at well-defined locations along the wire. The strain recovery during unloading is attributed to reverse twinning, driven by the internal stress generated on loading between the elastic γ precipitates and the twinning martensite matrix. Lastly, the temperature dependence of the twining stress on loading is related to the change in tetragonality of the martensite, as measured by X-ray diffraction.

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [2]
  1. Northwestern Univ., Evanston, IL (United States); Beijing Inst. of Technology, Beijing (China)
  2. Northwestern Univ., Evanston, IL (United States)
  3. Beijing Inst. of Technology, Beijing (China)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)
  5. Univ. of Science and Technology, Beijing (China)
  6. Boise State Univ., ID (United States)
Publication Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Org.:
National Science Foundation (NSF); National Key Basic Research Program of China; USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1245144
Alternate Identifier(s):
OSTI ID: 1251455
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 99; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Ni2MnGa; oligocrystalline materials; shape-memory effect; size effect; superelasticity; twinning

Citation Formats

Wang, Z. L., Zheng, P., Nie, Z. H., Ren, Y., Wang, Y. D., Mullner, P., and Dunand, D. C. Superelasticity by reversible variant reorientation in a Ni-Mn-Ga microwire with bamboo grains. United States: N. p., 2015. Web. doi:10.1016/j.actamat.2015.08.002.
Wang, Z. L., Zheng, P., Nie, Z. H., Ren, Y., Wang, Y. D., Mullner, P., & Dunand, D. C. Superelasticity by reversible variant reorientation in a Ni-Mn-Ga microwire with bamboo grains. United States. https://doi.org/10.1016/j.actamat.2015.08.002
Wang, Z. L., Zheng, P., Nie, Z. H., Ren, Y., Wang, Y. D., Mullner, P., and Dunand, D. C. Wed . "Superelasticity by reversible variant reorientation in a Ni-Mn-Ga microwire with bamboo grains". United States. https://doi.org/10.1016/j.actamat.2015.08.002. https://www.osti.gov/servlets/purl/1245144.
@article{osti_1245144,
title = {Superelasticity by reversible variant reorientation in a Ni-Mn-Ga microwire with bamboo grains},
author = {Wang, Z. L. and Zheng, P. and Nie, Z. H. and Ren, Y. and Wang, Y. D. and Mullner, P. and Dunand, D. C.},
abstractNote = {The link between microstructure and mechanical properties is investigated for a superelastic Ni–Mn–Ga microwire with 226 μm diameter, created by solidification via the Taylor method. The wire, which consists of bamboo grains with tetragonal martensite matrix and coarse γ precipitates, exhibits fully reversible superelastic behavior up to 4% tensile strain. Upon multiple tensile load–unload cycles, reproducible stress fluctuations of ~3 MPa are measured on the loading superelastic stress plateau of ~50 MPa. During cycles at various temperatures spanning -70 to 55 °C, the plateau stress decreases from 58 to 48 MPa near linearly with increasing temperature. Based on in situ synchrotron X-ray diffraction measurements, we conclude that this superelastic behavior is due to reversible martensite variants reorientation (i.e., reversible twinning) with lattice rotation of ~13°. The reproducible stress plateau fluctuations are assigned to reversible twinning at well-defined locations along the wire. The strain recovery during unloading is attributed to reverse twinning, driven by the internal stress generated on loading between the elastic γ precipitates and the twinning martensite matrix. Lastly, the temperature dependence of the twining stress on loading is related to the change in tetragonality of the martensite, as measured by X-ray diffraction.},
doi = {10.1016/j.actamat.2015.08.002},
journal = {Acta Materialia},
number = ,
volume = 99,
place = {United States},
year = {Wed Aug 26 00:00:00 EDT 2015},
month = {Wed Aug 26 00:00:00 EDT 2015}
}

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Works referencing / citing this record:

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