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Title: Investigating the compressive strength and strain localization of nanotwinned nickel alloys

Abstract

Sputter deposited nickel-molybdenum-tungsten (Ni-Mo-W) thin films possess a beneficial suite of properties that stem from the extremely fine growth twins that form during the deposition process. Previously these materi- als were only characterized in tension, however, in this study in situ micropillar compression and post-mortem microstructural analysis of nanotwinned Ni84Mo11W5 micropillars were employed to measure the compressive response and elucidate the attendant deformation mechanisms. The pillars exhibit Hookean behavior to com- pressive strengths of 3-3.5 GPa and the onset of non-linear plastic flow was manifest by discrete strain bursts and highly localized shear bands. Plastic deformation was concentrated at the top of the pillar, while the bulk of the micropillar was nominally unaffected. Post-mortem investigations indicate that at sufficiently high stresses shear banding is triggered, resulting in intense and highly localized plastic deformation that led to the formation of twin-free nanocrystalline grains within highly deformed shear bands. By contrast, the regions adjacent to the shear bands were unaffected. The absence of detwinning and dislocation glide mechanisms was unexpected and in direct contrast to what has been observed in nanotwinned Cu-Al. Post-mortem observations of the Ni-Mo-W micropillars suggest that the ultrafine twins create a unique form of dislocation starvation and source-limitedmore » plasticity. The ultrahigh compressive strength is governed by the triggering of shear bands rather than the activa- tion of dislocation glide. Finally, the specialized nature of plasticity in nanotwinned Ni-Mo-W is clear, even though the precise trigger for shear band formation in nanotwinned Ni-Mo-W remains to be identified.« less

Authors:
ORCiD logo [1]; ORCiD logo [2];  [1];  [2];  [1];  [3];  [2];  [4];  [1];  [1]
  1. Johns Hopkins Univ., Baltimore, MD (United States)
  2. Texas A & M Univ., College Station, TX (United States)
  3. Nanomechanics Inc./KLA-Tencor, Oak Ridge, TN (United States)
  4. Univ. of Illinois at Urbana-Champaign, IL (United States)
Publication Date:
Research Org.:
Johns Hopkins Univ., Baltimore, MD (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1724100
Alternate Identifier(s):
OSTI ID: 1809733
Grant/Contract Number:  
FG02-07ER46437; -FG02-07ER46437
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 204; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Anisotropy; Shear bands; Nanotwins; Localization; Micropillar

Citation Formats

Valentino, Gianna M., Xiang, Sisi, Ma, Luoning, Xie, Kelvin Y., He, Mo-Rigen, Oliver, Warren C., Pharr, George M., Krogstad, Jessica A., Weihs, Timothy P., and Hemker, Kevin J. Investigating the compressive strength and strain localization of nanotwinned nickel alloys. United States: N. p., 2020. Web. doi:10.1016/j.actamat.2020.116507.
Valentino, Gianna M., Xiang, Sisi, Ma, Luoning, Xie, Kelvin Y., He, Mo-Rigen, Oliver, Warren C., Pharr, George M., Krogstad, Jessica A., Weihs, Timothy P., & Hemker, Kevin J. Investigating the compressive strength and strain localization of nanotwinned nickel alloys. United States. https://doi.org/10.1016/j.actamat.2020.116507
Valentino, Gianna M., Xiang, Sisi, Ma, Luoning, Xie, Kelvin Y., He, Mo-Rigen, Oliver, Warren C., Pharr, George M., Krogstad, Jessica A., Weihs, Timothy P., and Hemker, Kevin J. Sun . "Investigating the compressive strength and strain localization of nanotwinned nickel alloys". United States. https://doi.org/10.1016/j.actamat.2020.116507. https://www.osti.gov/servlets/purl/1724100.
@article{osti_1724100,
title = {Investigating the compressive strength and strain localization of nanotwinned nickel alloys},
author = {Valentino, Gianna M. and Xiang, Sisi and Ma, Luoning and Xie, Kelvin Y. and He, Mo-Rigen and Oliver, Warren C. and Pharr, George M. and Krogstad, Jessica A. and Weihs, Timothy P. and Hemker, Kevin J.},
abstractNote = {Sputter deposited nickel-molybdenum-tungsten (Ni-Mo-W) thin films possess a beneficial suite of properties that stem from the extremely fine growth twins that form during the deposition process. Previously these materi- als were only characterized in tension, however, in this study in situ micropillar compression and post-mortem microstructural analysis of nanotwinned Ni84Mo11W5 micropillars were employed to measure the compressive response and elucidate the attendant deformation mechanisms. The pillars exhibit Hookean behavior to com- pressive strengths of 3-3.5 GPa and the onset of non-linear plastic flow was manifest by discrete strain bursts and highly localized shear bands. Plastic deformation was concentrated at the top of the pillar, while the bulk of the micropillar was nominally unaffected. Post-mortem investigations indicate that at sufficiently high stresses shear banding is triggered, resulting in intense and highly localized plastic deformation that led to the formation of twin-free nanocrystalline grains within highly deformed shear bands. By contrast, the regions adjacent to the shear bands were unaffected. The absence of detwinning and dislocation glide mechanisms was unexpected and in direct contrast to what has been observed in nanotwinned Cu-Al. Post-mortem observations of the Ni-Mo-W micropillars suggest that the ultrafine twins create a unique form of dislocation starvation and source-limited plasticity. The ultrahigh compressive strength is governed by the triggering of shear bands rather than the activa- tion of dislocation glide. Finally, the specialized nature of plasticity in nanotwinned Ni-Mo-W is clear, even though the precise trigger for shear band formation in nanotwinned Ni-Mo-W remains to be identified.},
doi = {10.1016/j.actamat.2020.116507},
journal = {Acta Materialia},
number = ,
volume = 204,
place = {United States},
year = {Sun Nov 22 00:00:00 EST 2020},
month = {Sun Nov 22 00:00:00 EST 2020}
}

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