Correlative deformation mechanisms in NixCo1-xO/ZrO2(CaO) directionally solidified eutectic composites with a confined metallic interphase

Nasim Alem; Vinayak P. Dravid

doi:10.1016/j.actamat.2008.05.008

Correlative deformation mechanisms in Ni_xCo_1-xO/ZrO₂(CaO) directionally solidified eutectic composites with a confined metallic interphase

Nasim Alem, Vinayak P. Dravid

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

4 Scopus citations

Abstract

Ni_xCo_1-xO/ZrO₂(CaO) directionally solidified eutectic composites have been previously shown to form Ni(Co) metallic interphases mediating Ni_xCo_1-xO and ZrO₂(CaO) phases upon chemical reduction of the composite at high temperatures. Vickers and nanoindentation experiments indicate characteristics of toughening enhancement in the reduced composite due to plastic deformation of the confined metallic interphase. This paper reports on the effect of size scale and chemistry of the metallic interphase on the phenomenological aspects of deformation behavior and the extent of plasticity at different length scales in the reduced eutectic model system. Transmission electron microscopy observations clearly show that a size-dependent deformation mechanism operates within the metallic interphase. A decrease in the extent of strain energy absorption, dislocation activity and twinning propensity is observed within the ductile interphase with decreasing size scale. In addition, a transition is observed in the small-scale deformation mechanism of the metallic interphase with changes in the composition of the interphase.

Original language	English (US)
Pages (from-to)	4378-4389
Number of pages	12
Journal	Acta Materialia
Volume	56
Issue number	16
DOIs	https://doi.org/10.1016/j.actamat.2008.05.008
State	Published - Oct 2008

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

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10.1016/j.actamat.2008.05.008

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@article{c3dbf5178c1543dcb4d685ffe76719ef,

title = "Correlative deformation mechanisms in NixCo1-xO/ZrO2(CaO) directionally solidified eutectic composites with a confined metallic interphase",

abstract = "NixCo1-xO/ZrO2(CaO) directionally solidified eutectic composites have been previously shown to form Ni(Co) metallic interphases mediating NixCo1-xO and ZrO2(CaO) phases upon chemical reduction of the composite at high temperatures. Vickers and nanoindentation experiments indicate characteristics of toughening enhancement in the reduced composite due to plastic deformation of the confined metallic interphase. This paper reports on the effect of size scale and chemistry of the metallic interphase on the phenomenological aspects of deformation behavior and the extent of plasticity at different length scales in the reduced eutectic model system. Transmission electron microscopy observations clearly show that a size-dependent deformation mechanism operates within the metallic interphase. A decrease in the extent of strain energy absorption, dislocation activity and twinning propensity is observed within the ductile interphase with decreasing size scale. In addition, a transition is observed in the small-scale deformation mechanism of the metallic interphase with changes in the composition of the interphase.",

author = "Nasim Alem and Dravid, {Vinayak P.}",

note = "Funding Information: We are grateful to Dr. Luke Brewer and Prof. Alex Revcolevschi for the original growth of the Ni x Co 1− x O/ZrO 2 (CaO) crystals used in this research. This research is partially supported by DOE-BES and NSF-DMR grants. The scanning/transmission electron microscopy and nanoindentation work were respectively performed at the (EPIC) and (NIFTI) facilities of NUANCE Center at Northwestern University. NUANCE Center is supported by NSF-NSEC, NSF-MRSEC, Keck Foundation, the State of Illinois, and Northwestern University. The FIB Lift-off TEM sample preparation technique was carried out in the Center for Microanalysis of Materials, University of Illinois at Urbana-Champaign, which is partially supported by the US Department of Energy under grant DEFG02-91-ER45439. We are also grateful to Mike Marshall at the Center for Microanalysis of Materials for his help on the FIB Lift-off TEM sample preparation technique.",

year = "2008",

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doi = "10.1016/j.actamat.2008.05.008",

language = "English (US)",

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AU - Alem, Nasim

AU - Dravid, Vinayak P.

N1 - Funding Information: We are grateful to Dr. Luke Brewer and Prof. Alex Revcolevschi for the original growth of the Ni x Co 1− x O/ZrO 2 (CaO) crystals used in this research. This research is partially supported by DOE-BES and NSF-DMR grants. The scanning/transmission electron microscopy and nanoindentation work were respectively performed at the (EPIC) and (NIFTI) facilities of NUANCE Center at Northwestern University. NUANCE Center is supported by NSF-NSEC, NSF-MRSEC, Keck Foundation, the State of Illinois, and Northwestern University. The FIB Lift-off TEM sample preparation technique was carried out in the Center for Microanalysis of Materials, University of Illinois at Urbana-Champaign, which is partially supported by the US Department of Energy under grant DEFG02-91-ER45439. We are also grateful to Mike Marshall at the Center for Microanalysis of Materials for his help on the FIB Lift-off TEM sample preparation technique.

PY - 2008/10

Y1 - 2008/10

N2 - NixCo1-xO/ZrO2(CaO) directionally solidified eutectic composites have been previously shown to form Ni(Co) metallic interphases mediating NixCo1-xO and ZrO2(CaO) phases upon chemical reduction of the composite at high temperatures. Vickers and nanoindentation experiments indicate characteristics of toughening enhancement in the reduced composite due to plastic deformation of the confined metallic interphase. This paper reports on the effect of size scale and chemistry of the metallic interphase on the phenomenological aspects of deformation behavior and the extent of plasticity at different length scales in the reduced eutectic model system. Transmission electron microscopy observations clearly show that a size-dependent deformation mechanism operates within the metallic interphase. A decrease in the extent of strain energy absorption, dislocation activity and twinning propensity is observed within the ductile interphase with decreasing size scale. In addition, a transition is observed in the small-scale deformation mechanism of the metallic interphase with changes in the composition of the interphase.

AB - NixCo1-xO/ZrO2(CaO) directionally solidified eutectic composites have been previously shown to form Ni(Co) metallic interphases mediating NixCo1-xO and ZrO2(CaO) phases upon chemical reduction of the composite at high temperatures. Vickers and nanoindentation experiments indicate characteristics of toughening enhancement in the reduced composite due to plastic deformation of the confined metallic interphase. This paper reports on the effect of size scale and chemistry of the metallic interphase on the phenomenological aspects of deformation behavior and the extent of plasticity at different length scales in the reduced eutectic model system. Transmission electron microscopy observations clearly show that a size-dependent deformation mechanism operates within the metallic interphase. A decrease in the extent of strain energy absorption, dislocation activity and twinning propensity is observed within the ductile interphase with decreasing size scale. In addition, a transition is observed in the small-scale deformation mechanism of the metallic interphase with changes in the composition of the interphase.

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ER -

Correlative deformation mechanisms in Ni_xCo_1-xO/ZrO₂(CaO) directionally solidified eutectic composites with a confined metallic interphase

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