Title: NEUTRON DIFFRACTION AND ELECTRON MICROSCOPY STUDIES OF REDUCTION REACTIONS

Abstract:
In-situ metal-ceramic composites consisting of Ni particles embedded in alumina matrices were obtained by the partial reduction of NiAl² O⁴. Neutron diffraction studies were performed on these materials to study the evolution of phases in situ during reduction and to determine the stress state of various phases involved. The volume shrinkage that accompanies the redaction reaction generates residual stresses which profoundly affect the microstructure evolution. The diffraction results will be correlated with microstructure observations by electron microscopy. Attempts to utilize these residual stresses to place a ceramic material in a compressive stress state for improved fracture resistance (i.e." Tempering") will also be explained.
(Ref. SXVIII-031-97)

Source: NDE of Ceramics '97 May 4-7, Symposium on Nondestructive Evaluation of Ceramics at the American Ceramic Society 99th Annual Meeting, Cincinnati, Ohio.
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