Cyclic compression response of micropillars extracted from textured nanocrystalline NiTi thin-walled tubes

Ghassemi-Armaki, Hassan; Leff, Asher C.; Taheri, Mitra L.; Dahal, J.; Kamarajugadda, M.; Kumar, K. Sharvan

doi:10.1016/j.actamat.2017.06.043

Title: Cyclic compression response of micropillars extracted from textured nanocrystalline NiTi thin-walled tubes

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Abstract

Compression-compression cyclic deformation of nanocrystalline NiTi tubes intended for medical stents and with an outer diameter of 1 mm and wall thickness of 70 μm was studied using micropillars produced by FIB with the loading axis orthogonal to the tube axis. These micropillars were cycled in a displacement-controlled mode using a nanoindenter equipped with a flat punch to strain levels of 4, 6 and 8% in each cycle and specimens were subjected to several hundred cycles. Furthermore, the cyclic response of two NiTi tubes, one with Af of 17 °C and the other with an Af of -5 °C is compared. The texture of the tube with the Af of -5 °C was measured at the microscopic level using transmission electron microscopy and at the macroscopic level by X-ray diffraction and good agreement was noted. Characteristics such as i) a reduction in the forward transformation stress, ii) increase in maximum stress for a given displacement amplitude, and iii) a reduction in the hysteresis loop area, all with increasing number of cycles, observed typically during cyclic deformation of conventional macroscopic specimens, were captured in the micropillar cyclic tests. Our observations lead to the conclusion that micropillar compression testing in a cyclicmore »« less

Authors:

Ghassemi-Armaki, Hassan ^[1]; Leff, Asher C. ^[2]; Taheri, Mitra L. ^[2]; Dahal, J. ^[3]; Kamarajugadda, M. ^[3]; Kumar, K. Sharvan ^[1]

Brown Univ., Providence, RI (United States). School of Engineering
Drexel Univ., Philadelphia, PA (United States). Dept. of Materials Engineering
Core Technologies, Minneapolis, MN (United States)

Publication Date:: 2017-06-22

Research Org.:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1394986

Alternate Identifier(s):: OSTI ID: 1550169

Report Number(s):: LA-UR-17-26380
Journal ID: ISSN 1359-6454

Grant/Contract Number:: AC52-06NA25396; SC0008274

Resource Type:: Accepted Manuscript

Journal Name:: Acta Materialia

Additional Journal Information:: Journal Volume: 136; Journal Issue: C; Journal ID: ISSN 1359-6454

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; Cyclic deformation; Shape memory alloys; Micropillars; Texture; Nanocrystalline

Citation Formats


                    Ghassemi-Armaki, Hassan, Leff, Asher C., Taheri, Mitra L., Dahal, J., Kamarajugadda, M., and Kumar, K. Sharvan. Cyclic compression response of micropillars extracted from textured nanocrystalline NiTi thin-walled tubes.  United States: N. p., 2017. 
Web.  doi:10.1016/j.actamat.2017.06.043.

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                    Ghassemi-Armaki, Hassan, Leff, Asher C., Taheri, Mitra L., Dahal, J., Kamarajugadda, M., & Kumar, K. Sharvan. Cyclic compression response of micropillars extracted from textured nanocrystalline NiTi thin-walled tubes.  United States.  https://doi.org/10.1016/j.actamat.2017.06.043

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                    Ghassemi-Armaki, Hassan, Leff, Asher C., Taheri, Mitra L., Dahal, J., Kamarajugadda, M., and Kumar, K. Sharvan. Thu .  
"Cyclic compression response of micropillars extracted from textured nanocrystalline NiTi thin-walled tubes".  United States.  https://doi.org/10.1016/j.actamat.2017.06.043.  https://www.osti.gov/servlets/purl/1394986.

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@article{osti_1394986,

  title        = {Cyclic compression response of micropillars extracted from textured nanocrystalline NiTi thin-walled tubes},

  author       = {Ghassemi-Armaki, Hassan and Leff, Asher C. and Taheri, Mitra L. and Dahal, J. and Kamarajugadda, M. and Kumar, K. Sharvan},

  abstractNote = {Compression-compression cyclic deformation of nanocrystalline NiTi tubes intended for medical stents and with an outer diameter of 1 mm and wall thickness of 70 μm was studied using micropillars produced by FIB with the loading axis orthogonal to the tube axis. These micropillars were cycled in a displacement-controlled mode using a nanoindenter equipped with a flat punch to strain levels of 4, 6 and 8% in each cycle and specimens were subjected to several hundred cycles. Furthermore, the cyclic response of two NiTi tubes, one with Af of 17 °C and the other with an Af of -5 °C is compared. The texture of the tube with the Af of -5 °C was measured at the microscopic level using transmission electron microscopy and at the macroscopic level by X-ray diffraction and good agreement was noted. Characteristics such as i) a reduction in the forward transformation stress, ii) increase in maximum stress for a given displacement amplitude, and iii) a reduction in the hysteresis loop area, all with increasing number of cycles, observed typically during cyclic deformation of conventional macroscopic specimens, were captured in the micropillar cyclic tests. Our observations lead to the conclusion that micropillar compression testing in a cyclic mode can enable characterizing the orientation-dependent response in such small dimension components that see complex loading in service, and additionally provide an opportunity for calibrating constitutive equations in micromechanical models.},

  doi          = {10.1016/j.actamat.2017.06.043},

  journal      = {Acta Materialia},

  number       = C,

  volume       = 136,

  place        = {United States},

  year         = {2017},

  month        = {6}

}

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