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Atomistic characterization of pseudoelasticity and shape memory in NiTi nanopillars

Publication ,  Journal Article
Zhong, Y; Gall, K; Zhu, T
Published in: Acta Materialia
October 1, 2012

Molecular dynamics simulations are performed to study the atomistic mechanisms governing the pseudoelasticity and shape memory in nickel-titanium (NiTi) nanostructures. For a 〈1 1 0〉 - oriented nanopillar subjected to compressive loading-unloading, we observe either a pseudoelastic or shape memory response, depending on the applied strain and temperature that control the reversibility of phase transformation and deformation twinning. We show that irreversible twinning arises owing to the dislocation pinning of twin boundaries, while hierarchically twinned microstructures facilitate the reversible twinning. The nanoscale size effects are manifested as the load serration, stress plateau and large hysteresis loop in stress-strain curves that result from the high stresses required to drive the nucleation-controlled phase transformation and deformation twinning in nanosized volumes. Our results underscore the importance of atomistically resolved modeling for understanding the phase and deformation reversibilities that dictate the pseudoelasticity and shape memory behavior in nanostructured shape memory alloys. © 2012 Published by Elsevier Ltd. on behalf of Acta Materialia Inc.

Duke Scholars

Published In

Acta Materialia

DOI

ISSN

1359-6454

Publication Date

October 1, 2012

Volume

60

Issue

18

Start / End Page

6301 / 6311

Related Subject Headings

  • Materials
  • 5104 Condensed matter physics
  • 4017 Mechanical engineering
  • 4016 Materials engineering
  • 0913 Mechanical Engineering
  • 0912 Materials Engineering
  • 0204 Condensed Matter Physics
 

Citation

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Zhong, Y., Gall, K., & Zhu, T. (2012). Atomistic characterization of pseudoelasticity and shape memory in NiTi nanopillars. Acta Materialia, 60(18), 6301–6311. https://doi.org/10.1016/j.actamat.2012.08.004
Zhong, Y., K. Gall, and T. Zhu. “Atomistic characterization of pseudoelasticity and shape memory in NiTi nanopillars.” Acta Materialia 60, no. 18 (October 1, 2012): 6301–11. https://doi.org/10.1016/j.actamat.2012.08.004.
Zhong Y, Gall K, Zhu T. Atomistic characterization of pseudoelasticity and shape memory in NiTi nanopillars. Acta Materialia. 2012 Oct 1;60(18):6301–11.
Zhong, Y., et al. “Atomistic characterization of pseudoelasticity and shape memory in NiTi nanopillars.” Acta Materialia, vol. 60, no. 18, Oct. 2012, pp. 6301–11. Scopus, doi:10.1016/j.actamat.2012.08.004.
Zhong Y, Gall K, Zhu T. Atomistic characterization of pseudoelasticity and shape memory in NiTi nanopillars. Acta Materialia. 2012 Oct 1;60(18):6301–6311.
Journal cover image

Published In

Acta Materialia

DOI

ISSN

1359-6454

Publication Date

October 1, 2012

Volume

60

Issue

18

Start / End Page

6301 / 6311

Related Subject Headings

  • Materials
  • 5104 Condensed matter physics
  • 4017 Mechanical engineering
  • 4016 Materials engineering
  • 0913 Mechanical Engineering
  • 0912 Materials Engineering
  • 0204 Condensed Matter Physics