Superplasticity and cooperative grain boundary sliding in nanocrystalline Ni3Al

N. A. Mara; A. V. Sergueeva; T. D. Mara; S. X. McFadden; A. K. Mukherjee

doi:10.1016/j.msea.2006.08.123

Superplasticity and cooperative grain boundary sliding in nanocrystalline Ni₃Al

N. A. Mara, A. V. Sergueeva, T. D. Mara, S. X. McFadden, A. K. Mukherjee

Chemical Engineering and Materials Science

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

38 Scopus citations

Abstract

Cooperative grain boundary sliding (CGBS) has been shown to account for the majority of macroscopic strain seen in microcrystalline metallic systems undergoing superplastic deformation. While CGBS has been observed on the surface of microcrystalline samples deforming superplastically through the shifting of diamond scribe lines, there have been few transmission electron microscopy results showing such occurrences in the bulk of the material, or the details behind the micromechanism of CGBS. In this work, nanocrystalline Ni₃Al produced via high-pressure torsion is deformed superplastically in the electron microscope. High-temperature (∼700 °C) in situ tensile testing shows the nature of CGBS at the nanoscale through direct observation of this phenomenon.

Original language	English (US)
Pages (from-to)	238-244
Number of pages	7
Journal	Materials Science and Engineering: A
Volume	463
Issue number	1-2
DOIs	https://doi.org/10.1016/j.msea.2006.08.123
State	Published - Aug 15 2007

Bibliographical note

Funding Information:
The authors would like to acknowledge the support of the National Science Foundation, grant number NSF-DMR-0240144. All in situ microscopy was carried out with the generous support of the National Center for Electron Microscopy (NCEM) at the Lawrence Berkeley National Laboratory.

Keywords

Grain boundary sliding
High-temperature mechanical behavior
Nanocrystalline material
Nanocrystalline plasticity
Nickel aluminide
Superplasticity

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title = "Superplasticity and cooperative grain boundary sliding in nanocrystalline Ni3Al",

abstract = "Cooperative grain boundary sliding (CGBS) has been shown to account for the majority of macroscopic strain seen in microcrystalline metallic systems undergoing superplastic deformation. While CGBS has been observed on the surface of microcrystalline samples deforming superplastically through the shifting of diamond scribe lines, there have been few transmission electron microscopy results showing such occurrences in the bulk of the material, or the details behind the micromechanism of CGBS. In this work, nanocrystalline Ni3Al produced via high-pressure torsion is deformed superplastically in the electron microscope. High-temperature (∼700 °C) in situ tensile testing shows the nature of CGBS at the nanoscale through direct observation of this phenomenon.",

keywords = "Grain boundary sliding, High-temperature mechanical behavior, Nanocrystalline material, Nanocrystalline plasticity, Nickel aluminide, Superplasticity",

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note = "Funding Information: The authors would like to acknowledge the support of the National Science Foundation, grant number NSF-DMR-0240144. All in situ microscopy was carried out with the generous support of the National Center for Electron Microscopy (NCEM) at the Lawrence Berkeley National Laboratory.",

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AU - Mara, N. A.

AU - Sergueeva, A. V.

AU - Mara, T. D.

AU - McFadden, S. X.

AU - Mukherjee, A. K.

N1 - Funding Information: The authors would like to acknowledge the support of the National Science Foundation, grant number NSF-DMR-0240144. All in situ microscopy was carried out with the generous support of the National Center for Electron Microscopy (NCEM) at the Lawrence Berkeley National Laboratory.

PY - 2007/8/15

Y1 - 2007/8/15

N2 - Cooperative grain boundary sliding (CGBS) has been shown to account for the majority of macroscopic strain seen in microcrystalline metallic systems undergoing superplastic deformation. While CGBS has been observed on the surface of microcrystalline samples deforming superplastically through the shifting of diamond scribe lines, there have been few transmission electron microscopy results showing such occurrences in the bulk of the material, or the details behind the micromechanism of CGBS. In this work, nanocrystalline Ni3Al produced via high-pressure torsion is deformed superplastically in the electron microscope. High-temperature (∼700 °C) in situ tensile testing shows the nature of CGBS at the nanoscale through direct observation of this phenomenon.

AB - Cooperative grain boundary sliding (CGBS) has been shown to account for the majority of macroscopic strain seen in microcrystalline metallic systems undergoing superplastic deformation. While CGBS has been observed on the surface of microcrystalline samples deforming superplastically through the shifting of diamond scribe lines, there have been few transmission electron microscopy results showing such occurrences in the bulk of the material, or the details behind the micromechanism of CGBS. In this work, nanocrystalline Ni3Al produced via high-pressure torsion is deformed superplastically in the electron microscope. High-temperature (∼700 °C) in situ tensile testing shows the nature of CGBS at the nanoscale through direct observation of this phenomenon.

KW - Grain boundary sliding

KW - High-temperature mechanical behavior

KW - Nanocrystalline material

KW - Nanocrystalline plasticity

KW - Nickel aluminide

KW - Superplasticity

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