Open AccessInvestigations of the reduction of NiAl{sub 2}O{sub 4}. 2: X-ray diffraction studies
Author(s) -
B. Clausen,
P. Rangaswamy,
M.A.M. Bourke,
E. Uestuendag,
S.L. Sass,
Thomas Barbieri
Publication year - 1998
Publication title -
osti oai (u.s. department of energy office of scientific and technical information)
Language(s) - English
Resource type - Reports
DOI - 10.2172/296729
Subject(s) - nial , materials science , ceramic , residual stress , diffraction , shrinkage , compression (physics) , nickel , stress (linguistics) , composite number , x ray , x ray crystallography , reduction (mathematics) , metal , finite element method , composite material , metallurgy , crystallography , thermodynamics , geometry , intermetallic , optics , physics , alloy , chemistry , mathematics , linguistics , philosophy
The volume shrinkage that accompanies the reduction of NiAl{sub 2}O{sub 4} to a metal-ceramic composite of nickel and alumina leads to residual stress buildup. The authors have attempted to utilize these stresses to temper a ceramic component by placing it under compression. To prove the concept, they produced model specimens which they investigated using X-ray diffraction. Employing the conventional d vs. sin{sup 2} {Psi} method to map surface stresses, the results obtained from these measurements are presented together with finite element calculation predictions used to interpret experimental stress data
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