Superplastic nanocrystalline ceramics at room temperature and high strain rates

J. Y. Zhang; Z. D. Sha; P. S. Branicio; Y. W. Zhang; V. Sorkin; Q. X. Pei; D. J. Srolovitz

doi:10.1016/j.scriptamat.2013.06.017

Superplastic nanocrystalline ceramics at room temperature and high strain rates

J. Y. Zhang
, Z. D. Sha
, P. S. Branicio
, Y. W. Zhang
, V. Sorkin
, Q. X. Pei
, D. J. Srolovitz

Agency for Science, Technology and Research, Singapore
University of Pennsylvania

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

30 Scopus citations

Abstract

Tensile-loading molecular dynamics simulations show that nanocrystalline SiC not only becomes ductile, but can be superplastically deformed at room temperature when grain sizes are reduced to d ∼ 2 nm. The calculated strain rate sensitivity, 0.67, implies a superplastic ceramic able to attain strains of up to 1000% at room temperature and typical strain rates (∼10^-2 s^-1). The origin of the superplasticity is linked to an unusually steep rise in creep rate to 10⁶ s^-1 for d = 2 nm. The results explain recent observations in SiC nanowires and suggest novel opportunities for structural ceramics.

Original language	English
Pages (from-to)	525-528
Number of pages	4
Journal	Scripta Materialia
Volume	69
Issue number	7
DOIs	https://doi.org/10.1016/j.scriptamat.2013.06.017
State	Published - Oct 2013
Externally published	Yes

Keywords

Grain size effect
High strain rates
Nanostructured ceramics
Silicon carbide
Superplasticity

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10.1016/j.scriptamat.2013.06.017

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title = "Superplastic nanocrystalline ceramics at room temperature and high strain rates",

abstract = "Tensile-loading molecular dynamics simulations show that nanocrystalline SiC not only becomes ductile, but can be superplastically deformed at room temperature when grain sizes are reduced to d ∼ 2 nm. The calculated strain rate sensitivity, 0.67, implies a superplastic ceramic able to attain strains of up to 1000\% at room temperature and typical strain rates (∼10-2 s-1). The origin of the superplasticity is linked to an unusually steep rise in creep rate to 106 s-1 for d = 2 nm. The results explain recent observations in SiC nanowires and suggest novel opportunities for structural ceramics.",

keywords = "Grain size effect, High strain rates, Nanostructured ceramics, Silicon carbide, Superplasticity",

author = "Zhang, \{J. Y.\} and Sha, \{Z. D.\} and Branicio, \{P. S.\} and Zhang, \{Y. W.\} and V. Sorkin and Pei, \{Q. X.\} and Srolovitz, \{D. J.\}",

year = "2013",

month = oct,

doi = "10.1016/j.scriptamat.2013.06.017",

language = "英语",

volume = "69",

pages = "525--528",

journal = "Scripta Materialia",

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publisher = "Acta Materialia Inc",

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TY - JOUR

T1 - Superplastic nanocrystalline ceramics at room temperature and high strain rates

AU - Zhang, J. Y.

AU - Sha, Z. D.

AU - Branicio, P. S.

AU - Zhang, Y. W.

AU - Sorkin, V.

AU - Pei, Q. X.

AU - Srolovitz, D. J.

PY - 2013/10

Y1 - 2013/10

N2 - Tensile-loading molecular dynamics simulations show that nanocrystalline SiC not only becomes ductile, but can be superplastically deformed at room temperature when grain sizes are reduced to d ∼ 2 nm. The calculated strain rate sensitivity, 0.67, implies a superplastic ceramic able to attain strains of up to 1000% at room temperature and typical strain rates (∼10-2 s-1). The origin of the superplasticity is linked to an unusually steep rise in creep rate to 106 s-1 for d = 2 nm. The results explain recent observations in SiC nanowires and suggest novel opportunities for structural ceramics.

AB - Tensile-loading molecular dynamics simulations show that nanocrystalline SiC not only becomes ductile, but can be superplastically deformed at room temperature when grain sizes are reduced to d ∼ 2 nm. The calculated strain rate sensitivity, 0.67, implies a superplastic ceramic able to attain strains of up to 1000% at room temperature and typical strain rates (∼10-2 s-1). The origin of the superplasticity is linked to an unusually steep rise in creep rate to 106 s-1 for d = 2 nm. The results explain recent observations in SiC nanowires and suggest novel opportunities for structural ceramics.

KW - Grain size effect

KW - High strain rates

KW - Nanostructured ceramics

KW - Silicon carbide

KW - Superplasticity

UR - https://www.scopus.com/pages/publications/84881480360

U2 - 10.1016/j.scriptamat.2013.06.017

DO - 10.1016/j.scriptamat.2013.06.017

M3 - 文章

AN - SCOPUS:84881480360

SN - 1359-6462

VL - 69

SP - 525

EP - 528

JO - Scripta Materialia

JF - Scripta Materialia

IS - 7

ER -

Superplastic nanocrystalline ceramics at room temperature and high strain rates

Abstract

Keywords

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