Synthesis of Ti matrix composites reinforced with TiC particles: thermodynamic equilibrium and change in microstructure

The evolution of TiC reinforcement during the high-temperature consolidation step of a particulate-reinforced Ti matrix composite has been studied. A four-step scenario has been highlighted starting with the dissolution of the smallest particles to reach C saturation of the Ti matrix, followed by a...

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Bibliographic Details
Published in:Journal of materials science 2017-04, Vol.52 (7), p.4129-4141
Main Authors: Roger, Jérôme, Gardiola, Bruno, Andrieux, Jérôme, Viala, Jean-Claude, Dezellus, Olivier
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemical Sciences
Chemistry and Materials Science
Classical Mechanics
Composition
Crystallography and Scattering Methods
Domains
Heat treating
Heat treatment
High temperature
Kurtosis
Material chemistry
Materials Science
Metal matrix composites
Original Paper
Ostwald ripening
Particle size
Particulate composites
Polymer Sciences
Solid Mechanics
Stoichiometry
Thermodynamic equilibrium
Thermodynamics
Titanium carbide
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Summary:The evolution of TiC reinforcement during the high-temperature consolidation step of a particulate-reinforced Ti matrix composite has been studied. A four-step scenario has been highlighted starting with the dissolution of the smallest particles to reach C saturation of the Ti matrix, followed by a change in the TiC stoichiometry from the initial TiC 0.96 composition to the equilibrium composition (TiC 0.57 ). This change in composition induces an increase in both the total mass fraction of reinforcement and the particle diameter. The diameter increase promotes contact between individual particles in the most reinforced domains and initiates an aggregation phenomenon that is responsible for the observed high growth rate of particles for heat treatment times shorter than 1 h. Finally Ostwald ripening is responsible for the growth of particles for longer heat treatment times.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-016-0677-y