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  Impact of asymmetric martensite and austenite nucleation and growth behavior on the phase stability and hysteresis of freestanding shape-memory nanoparticles

Ko, W.-S., Grabowski, B., & Neugebauer, J. (2018). Impact of asymmetric martensite and austenite nucleation and growth behavior on the phase stability and hysteresis of freestanding shape-memory nanoparticles. Physical Review Materials, 2(3): 030601. doi:10.1103/PhysRevMaterials.2.030601.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-A2C2-A Version Permalink: http://hdl.handle.net/21.11116/0000-0003-A2C4-8
Genre: Journal Article

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 Creators:
Ko, Won-Seok1, 2, Author              
Grabowski, Blazej1, Author              
Neugebauer, Jörg3, Author              
Affiliations:
1Adaptive Structural Materials (Simulation), Computational Materials Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863339              
2School of Materials Science and Engineering, University of Ulsan, 44610 Ulsan, Republic of Korea, ou_persistent22              
3Computational Materials Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863337              

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 Abstract: Martensitic transformations in nanoscaled shape-memory alloys exhibit characteristic features absent for the bulk counterparts. Detailed understanding is required for applications in micro- and nanoelectromechanical systems, and experimental limitations render atomistic simulation an important complementary approach. Using a recently developed, accurate potential we investigate the phase transformation in freestanding Ni-Ti shape-memory nanoparticles with molecular-dynamics simulations. The results confirm that the decrease in the transformation temperature with decreasing particle size is correlated with an overstabilization of the austenitic surface energy over the martensitic surface energy. However, a detailed atomistic analysis of the nucleation and growth behavior reveals an unexpected difference in the mechanisms determining the austenite finish and martensite start temperature. While the austenite finish temperature is directly affected by a contribution of the surface energy difference, the martensite start temperature is mostly affected by the transformation strain, contrary to general expectations. This insight not only explains the reduced transformation temperature but also the reduced thermal hysteresis in freestanding nanoparticles. © 2018 American Physical Society.

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Language(s): eng - English
 Dates: 2018-03-20
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1103/PhysRevMaterials.2.030601
BibTex Citekey: Ko2018
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Title: Physical Review Materials
  Abbreviation : Phys. Rev. Mat.
Source Genre: Journal
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Publ. Info: College Park, MD : American Physical Society
Pages: 6 Volume / Issue: 2 (3) Sequence Number: 030601 Start / End Page: - Identifier: ISSN: 2475-9953
CoNE: https://pure.mpg.de/cone/journals/resource/2475-9953