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Evaluation of Rule‐of‐Mixtures Predictions of Thermal Expansion in Powder‐Processed Ni–Al 2 O 3 Composites
Author(s) -
Bruck Hugh A.,
Rabin Barry H.
Publication year - 1999
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1999.tb02182.x
Subject(s) - thermal expansion , materials science , composite material , microstructure , particle (ecology) , phase (matter) , particle size , thermal , range (aeronautics) , thermodynamics , chemistry , oceanography , physics , organic chemistry , geology
Ni‐Al 2 O 3 composites containing 5 to 80 vol% Ni were produced using powder processing methods and their thermal expansion behavior was studied using dilatometry. By varying composition and relative particle sizes, either interpenetrating‐phase or particle‐reinforced microstructures were obtained. Experimentally determined values of the mean thermal expansion coefficient were compared with predictions made using two different rule‐of‐mixtures (ROM) formulations. Experimental results for interpenetrating‐phase composites were in reasonable agreement with linear ROM estimates. Certain particle‐reinforced microstructures that contain processing‐induced damage did not correlate as well with ROM predictions. By accounting for this damage in ROM models, better agreement with experimental observations was obtained. However, linear ROM predictions were reasonable over the entire composition range.