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Characterization and microanalysis of interfacial reactions in metal–matrix composite systems
Author(s) -
HEFFELFINGER J. R.,
KIESCHKE R. R.,
CARTER C. B.
Publication year - 1997
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 - 10.1046/j.1365-2818.1997.1490708.x
Subject(s) - microanalysis , composite number , characterization (materials science) , matrix (chemical analysis) , metal , materials science , chemical engineering , metal matrix composite , chemistry , nanotechnology , composite material , metallurgy , organic chemistry , engineering
Understanding the solid‐state reactions involved in metal/ceramic systems is important when combining the two types of materials into a composite. In this investigation, the solid‐state reaction between Al 2 O 3 (alumina) and a β‐Ti alloy has been characterized by transmission electron microscopy (TEM), scanning electron microscopy, parallel‐acquisition electron energy‐loss spectroscopy and X‐ray energy‐dispersive spectroscopy. Two different systems were used to investigate this reaction. The first system utilizes a controlled reaction geometry and involved diffusion bonding single‐crystal α‐alumina and a β‐Ti alloy. Here, three interfacial regions were found to form: a region of intermetallics (Ti 3 Al and TiAl) located near the alumina interface, an α‐Ti region, and a β‐Ti region (rich in Mo, the β‐phase stabilzer). Analysis of cross‐section TEM samples of this reaction revealed the presence of both Ti 3 Al and TiAl at the alumina interface. Orientation relationships between the intermetallics and the alumina are discussed. In the second, system, interfacial reactions inside metal–matrix composites that contain alumina and a β‐Ti alloy were investigated. Here, different coatings used in the MMCs are investigated for their ability to prevent the reaction between the matrix and fibres. Reaction products inside the MMCs are compared with those found in the model reaction geometry.