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In situ formation of composite microstructures
Author(s) -
HANDWERKER C. A.,
WALLACE J. S.,
FOECKE T. J.,
KATTNER U. R.,
BLENDELL J. E.
Publication year - 1995
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/j.1365-2818.1995.tb03644.x
Subject(s) - materials science , microstructure , transmission electron microscopy , scanning electron microscope , composite number , whisker , sintering , ceramic , grain growth , phase (matter) , grain size , metal , in situ , composite material , matrix (chemical analysis) , chemical engineering , metallurgy , nanotechnology , chemistry , organic chemistry , engineering
Summary Microstructural evolution in two in situ reinforced composite systems, one produced by partial reduction and the other by grain growth, has been examined over a range of size scales using light microscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Metal‐ceramic matrix composites were formed by the partial reduction of Al 2 O 3 –Cr 2 O 3 solid solutions to form Cr metal particles in an Al 2 O 3 –Cr 2 O 3 matrix which had a lower Cr 2 O 3 concentration. In a second system, grain growth of Si 3 N 4 during liquid phase sintering produced large, whisker‐like grains in a fine‐grained Si 3 N 4 matrix, bonded by an oxynitride phase. The mechanisms controlling microstructural evolution in these two systems were examined.