Abstract
This chapter presents a review of intermetallic-matrix composites that are toughened by ductile-phase reinforcements. The principles of ductile-phase toughening are first elucidated, followed by a highlight of the processing methods for fabricating these intermetallic composites via in situ and ex situ routes. Micromechanical modeling of various toughening mechanisms including crack trapping, blunting, and bridging in particulate, fibrous, or laminate composites are then presented. A summary of the fracture properties and their relationships to the underlying composite microstructure and toughening mechanisms is presented for ductile-phase-toughened WC, TiAlx, and Nb-based, Mo-based, and NiAl-based composites. Applications and future trends of the ductile-phase-toughened composites are discussed. Additional sources of information are also provided with appropriate references.
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