Influence of residual stresses on the evolution of microstructure during the partial reduction of NiAl2O4

E. Üstündag; Z. Zhang; M. L. Stocker; P. Rangaswamy; M. A.M. Bourke; S. Subramanian; K. E. Sickafus; J. A. Roberts; S. L. Sass

doi:10.1016/S0921-5093(97)00433-4

Influence of residual stresses on the evolution of microstructure during the partial reduction of NiAl₂O₄

E. Üstündag^*, Z. Zhang, M. L. Stocker, P. Rangaswamy, M. A.M. Bourke, S. Subramanian, K. E. Sickafus, J. A. Roberts, S. L. Sass

^*Corresponding author for this work

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

20 Citations (Scopus)

Abstract

Metal-ceramic microstructures were formed in situ by the partial reduction (i.e. the reduction of only one of the metallic elements) of the spinel compound NiAl₂O₄. Depending on reduction conditions, these microstructures consist of Ni particles embedded in an α-Al₂O₃ or a multiphase matrix called 'defect spinel'. The volume shrinkage that accompanies the reaction generates residual stresses which profoundly affect the microstructure evolution. Conversely, formation of metastable, intermediate phases, generation of porosity and cracking are all observed and may act to relax the residual stresses. Electron microscopy observations as well as both neutron and X-ray diffraction residual stress measurements are used to study the influence of residual stresses on the microstructure evolution during the reduction process.

Original language	English
Pages (from-to)	50-65
Number of pages	16
Journal	Materials Science and Engineering: A
Volume	238
Issue number	1
DOIs	https://doi.org/10.1016/S0921-5093(97)00433-4
Publication status	Published - 30 Oct 1997
Externally published	Yes

Funding

This work was supported by the US Office of Naval Research under Grant No. NOOO14-92-J-1526 at Cornell University and by a Laboratory Directed Research and Development project at Los Alamos National Laboratory. E. Ustiindag acknowledges the financial support by a Director-Funded Post-doctoral Fellowship at Los Alamos. S. Subramanian was supported by the US Department of Energy Grant No. DE-FG02-85ER45211 at Cornell. ML Stocker began this study as a project for an undergraduate Materials Science and Engineering Research Involvement course. The Manuel Lujan Jr. Neutron Scattering Center at Los Alamos is a national user facility supported by DOE/DP and DOE/ BES under contract W-7405-ENG-36. The use of the Materials Preparation, X-ray and Electron Microscopy facilities of the Materials Science Center at Cornell University, which is supported by the National Science Foundation is also acknowledged.

Funders	Funder number
DOE/DP
US Department of Energy
US Office of Naval Research
National Science Foundation
U.S. Department of Energy
Basic Energy Sciences	W-7405-ENG-36

Keywords

Microstructure
NiAlO
Reduction reactions
Residual stresses

Access to Document

10.1016/S0921-5093(97)00433-4

Cite this

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title = "Influence of residual stresses on the evolution of microstructure during the partial reduction of NiAl2O4",

abstract = "Metal-ceramic microstructures were formed in situ by the partial reduction (i.e. the reduction of only one of the metallic elements) of the spinel compound NiAl2O4. Depending on reduction conditions, these microstructures consist of Ni particles embedded in an α-Al2O3 or a multiphase matrix called 'defect spinel'. The volume shrinkage that accompanies the reaction generates residual stresses which profoundly affect the microstructure evolution. Conversely, formation of metastable, intermediate phases, generation of porosity and cracking are all observed and may act to relax the residual stresses. Electron microscopy observations as well as both neutron and X-ray diffraction residual stress measurements are used to study the influence of residual stresses on the microstructure evolution during the reduction process.",

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AU - Üstündag, E.

AU - Zhang, Z.

AU - Stocker, M. L.

AU - Rangaswamy, P.

AU - Bourke, M. A.M.

AU - Subramanian, S.

AU - Sickafus, K. E.

AU - Roberts, J. A.

AU - Sass, S. L.

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N2 - Metal-ceramic microstructures were formed in situ by the partial reduction (i.e. the reduction of only one of the metallic elements) of the spinel compound NiAl2O4. Depending on reduction conditions, these microstructures consist of Ni particles embedded in an α-Al2O3 or a multiphase matrix called 'defect spinel'. The volume shrinkage that accompanies the reaction generates residual stresses which profoundly affect the microstructure evolution. Conversely, formation of metastable, intermediate phases, generation of porosity and cracking are all observed and may act to relax the residual stresses. Electron microscopy observations as well as both neutron and X-ray diffraction residual stress measurements are used to study the influence of residual stresses on the microstructure evolution during the reduction process.

AB - Metal-ceramic microstructures were formed in situ by the partial reduction (i.e. the reduction of only one of the metallic elements) of the spinel compound NiAl2O4. Depending on reduction conditions, these microstructures consist of Ni particles embedded in an α-Al2O3 or a multiphase matrix called 'defect spinel'. The volume shrinkage that accompanies the reaction generates residual stresses which profoundly affect the microstructure evolution. Conversely, formation of metastable, intermediate phases, generation of porosity and cracking are all observed and may act to relax the residual stresses. Electron microscopy observations as well as both neutron and X-ray diffraction residual stress measurements are used to study the influence of residual stresses on the microstructure evolution during the reduction process.

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