Revealing cryogenic mechanical behavior and mechanisms in a microstructurally-stable, immiscible nanocrystalline alloy

B. C. Hornbuckle; C. Kale; S. Srinivasan; T. L. Luckenbaugh; Kiran Solanki; K. A. Darling

doi:10.1016/j.scriptamat.2018.09.035

Revealing cryogenic mechanical behavior and mechanisms in a microstructurally-stable, immiscible nanocrystalline alloy

B. C. Hornbuckle, C. Kale, S. Srinivasan, T. L. Luckenbaugh, Kiran Solanki, K. A. Darling

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

Here, the Cottrell–Stokes ratio in a microstructurally-stable Cu-3Ta (at.%) nanocrystalline alloy is examined from the standpoint of changes in deformation mechanisms. Toward this, uniaxial compression experiments were performed in the temperature range of 113 K – 273 K. The Cottrell-Stokes ratio at the lowest temperature tested was ~1.3, and the material exhibited a very low strain-rate sensitivity at cryogenic-temperatures. Transmission electron microscopy (TEM) characterization showed negligible average grain size coarsening and a transition in the deformation mechanism toward athermal activation processes such as twinning with the reduction in the testing temperature.

Original language	English (US)
Pages (from-to)	33-38
Number of pages	6
Journal	Scripta Materialia
Volume	160
DOIs	https://doi.org/10.1016/j.scriptamat.2018.09.035
State	Published - Feb 2019

Keywords

Cryogenic-temperature
Nanocrystalline
Transmission electron microscopy
Zener-Hollomon parameter

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

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@article{95148881411945e388c7f1c2f4af2efe,

title = "Revealing cryogenic mechanical behavior and mechanisms in a microstructurally-stable, immiscible nanocrystalline alloy",

abstract = "Here, the Cottrell–Stokes ratio in a microstructurally-stable Cu-3Ta (at.%) nanocrystalline alloy is examined from the standpoint of changes in deformation mechanisms. Toward this, uniaxial compression experiments were performed in the temperature range of 113 K – 273 K. The Cottrell-Stokes ratio at the lowest temperature tested was ~1.3, and the material exhibited a very low strain-rate sensitivity at cryogenic-temperatures. Transmission electron microscopy (TEM) characterization showed negligible average grain size coarsening and a transition in the deformation mechanism toward athermal activation processes such as twinning with the reduction in the testing temperature.",

keywords = "Cryogenic-temperature, Nanocrystalline, Transmission electron microscopy, Zener-Hollomon parameter",

author = "Hornbuckle, {B. C.} and C. Kale and S. Srinivasan and Luckenbaugh, {T. L.} and Kiran Solanki and Darling, {K. A.}",

note = "Funding Information: C.K., S.S., and K.N.S. acknowledges the support of the US Army Research Laboratory under contract W911NF-15-2-0038 and a National Science Foundation grant No. 1663287 . The authors would also like to acknowledge Qiuming Wei for fruitful discussion during the preparation of this manuscript. Appendix A Fig. A1 (A) Yield stress for Cu-3Ta and Cu-10Ta plotted as a function of Zener-Hollomon parameter at various cryogenic and high-temperatures (Points indicated by circular markers are for room temperature and above tests, while those indicated by square makers are for room temperature and below tests). (B) Yield stress for Cu–3Ta plotted as a function of Zener–Hollomon parameter at different cryogenic-temperature and a strain rate of 10 −3  s −1 . Fig. A1 Appendix B ",

year = "2019",

month = feb,

doi = "10.1016/j.scriptamat.2018.09.035",

language = "English (US)",

volume = "160",

pages = "33--38",

journal = "Scripta Materialia",

issn = "1359-6462",

publisher = "Elsevier Limited",

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TY - JOUR

T1 - Revealing cryogenic mechanical behavior and mechanisms in a microstructurally-stable, immiscible nanocrystalline alloy

AU - Hornbuckle, B. C.

AU - Kale, C.

AU - Srinivasan, S.

AU - Luckenbaugh, T. L.

AU - Solanki, Kiran

AU - Darling, K. A.

N1 - Funding Information: C.K., S.S., and K.N.S. acknowledges the support of the US Army Research Laboratory under contract W911NF-15-2-0038 and a National Science Foundation grant No. 1663287 . The authors would also like to acknowledge Qiuming Wei for fruitful discussion during the preparation of this manuscript. Appendix A Fig. A1 (A) Yield stress for Cu-3Ta and Cu-10Ta plotted as a function of Zener-Hollomon parameter at various cryogenic and high-temperatures (Points indicated by circular markers are for room temperature and above tests, while those indicated by square makers are for room temperature and below tests). (B) Yield stress for Cu–3Ta plotted as a function of Zener–Hollomon parameter at different cryogenic-temperature and a strain rate of 10 −3  s −1 . Fig. A1 Appendix B

PY - 2019/2

Y1 - 2019/2

N2 - Here, the Cottrell–Stokes ratio in a microstructurally-stable Cu-3Ta (at.%) nanocrystalline alloy is examined from the standpoint of changes in deformation mechanisms. Toward this, uniaxial compression experiments were performed in the temperature range of 113 K – 273 K. The Cottrell-Stokes ratio at the lowest temperature tested was ~1.3, and the material exhibited a very low strain-rate sensitivity at cryogenic-temperatures. Transmission electron microscopy (TEM) characterization showed negligible average grain size coarsening and a transition in the deformation mechanism toward athermal activation processes such as twinning with the reduction in the testing temperature.

AB - Here, the Cottrell–Stokes ratio in a microstructurally-stable Cu-3Ta (at.%) nanocrystalline alloy is examined from the standpoint of changes in deformation mechanisms. Toward this, uniaxial compression experiments were performed in the temperature range of 113 K – 273 K. The Cottrell-Stokes ratio at the lowest temperature tested was ~1.3, and the material exhibited a very low strain-rate sensitivity at cryogenic-temperatures. Transmission electron microscopy (TEM) characterization showed negligible average grain size coarsening and a transition in the deformation mechanism toward athermal activation processes such as twinning with the reduction in the testing temperature.

KW - Cryogenic-temperature

KW - Nanocrystalline

KW - Transmission electron microscopy

KW - Zener-Hollomon parameter

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