Investigation of the reduction of NiAl2O4 - I: Neutron diffraction studies

Ersan Ustundag*, Jay C. Hanan, B. Clausen, M. A.M. Bourke, S. L. Sass, T. J. Barbieri

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)

Abstract

In situ metal-ceramic composites consisting of Ni particles embedded in alumina matrices were obtained by the partial reduction of NiAl2O4. The volume shrinkage that accompanies the reduction reaction generates residual stresses. Neutron diffraction studies were performed for the first time at various temperatures to study the evolution of phases in situ during reduction and to determine their stress state. It was determined that compressive stresses of several hundred MPa in magnitude can be generated inside the unreduced part of spinel. It was also found that the stress generation is strongly influenced by material and processing variables such as reduction temperature and the initial density of spinel. The diffraction results were then compared to finite element calculations and a reasonable agreement was obtained.

Original languageEnglish
Pages (from-to)549-556
Number of pages8
JournalCeramic Engineering and Science Proceedings
Volume19
Issue number3
Publication statusPublished - 1998
Externally publishedYes
EventProceedings of the 1998 22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A. Part 1 (of 2) - Cocoa Beach, FL, USA
Duration: 20 Jan 199824 Jan 1998

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