Investigation of the reduction of NiAl{sub 2}O{sub 4}. 1: Neutron diffraction studies

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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 ... continued below

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9 p.

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Uestuendag, E.; Hanan, J.C.; Clausen, B.; Bourke, M.A.M.; Sass, S.L. & Barbieri, T.J. September 1, 1998.

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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.

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9 p.

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OSTI as DE98006341

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  • Engineering Ceramics Division conference and exposition on composites, advanced ceramics, materials and structures, Cocoa Beach, FL (United States), 20 Jan 1998

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  • Other: DE98006341
  • Report No.: LA-UR--98-948
  • Report No.: CONF-980110--
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 296606
  • Archival Resource Key: ark:/67531/metadc679489

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  • September 1, 1998

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  • July 25, 2015, 2:20 a.m.

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  • May 20, 2016, 2:53 p.m.

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Uestuendag, E.; Hanan, J.C.; Clausen, B.; Bourke, M.A.M.; Sass, S.L. & Barbieri, T.J. Investigation of the reduction of NiAl{sub 2}O{sub 4}. 1: Neutron diffraction studies, article, September 1, 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc679489/: accessed December 13, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.