Investigation of the reduction of NiAl{sub 2}O{sub 4}. 1: Neutron diffraction studies
- California Inst. of Tech., Pasadena, CA (United States)
- Los Alamos National Lab., NM (United States). Manuel Lujan Jr. Neutron Scattering Center
- Cornell Univ., Ithaca, NY (United States). Dept. of Materials Science and Engineering
In-situ metal-ceramic composites consisting of Ni particles embedded in alumina matrices were obtained by the partial reduction of NiAl{sub 2}O{sub 4}. 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.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE Assistant Secretary for Human Resources and Administration, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 296606
- Report Number(s):
- LA-UR-98-948; CONF-980110-; ON: DE98006341; TRN: AHC29903%%4
- Resource Relation:
- Conference: Engineering Ceramics Division conference and exposition on composites, advanced ceramics, materials and structures, Cocoa Beach, FL (United States), 20 Jan 1998; Other Information: PBD: [1998]
- Country of Publication:
- United States
- Language:
- English
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