Overview: layered metal/intermetallic composites formed by SHS reactions.
Rawers-JC; Alman-DE; Hawk-JA
Int J Self Prop High Temp Synth 1993 Nov; 2(1):12-24
Near-net-shaped metallic/intermetallic composites (MICs) have been successfully produced. These layered composites were formed in situ by initiating self-propagating high-temperature synthesis (SHS) reactions at the interfaces between metal foils. Specifically, aluminum foils were sandwiched between metal foils (Fe, Ni, Ti, and stainless steel) and heated in a hot-press to approximately the melting point of aluminum. An SHS reaction occurred at the metal/aluminum interface, consuming all of the aluminum foil and part of the metal foil, and resulting in a strongly bonded metal/aluminide interface. Thermally aging these MICs resulted in formation of a functionally gradient series of intermetallic phases. Tensile tests showed that failure in the composite always initiated within the intermetallic phase. After numerous cracks occurred within the intermetallic layers, the metal layers subsequently failed in a ductile manner. Preliminary tensile data suggest that the specific strength of the MICs exceeds that of the constituent metals.
Author Keywords: metallic-intermetallic composite; layered; aluminide; near-net-shape; specific strength
U.S. Bureau of Mines, 1450 Queen Avenue SW, Albany, OR 97321-2198
International Journal of Self-Propagating High-Temperature Synthesis