ALLOYING EFFECTS ON TUNGSTEN-FIBER-REINFORCED COPPER-ALLOY OR HIGH-TEMPERATURE-ALLOY MATRIX COMPOSITES

摘要

Relatively few metal-metal systems exist that would permit the creation of fiber-metal composites consisting of mutually insoluble constituents. It is anticipated that most high strength to weight ratio and high-temperature fiber composites ultimately to be produced will utilize high-strength fibers embedded in a highly alloyed matrix.nAn investigation was conducted to determine the effect of alloying on the tensile properties and microstructure of tungsteri-fiber-reinforced composites. Composites were made of tungsten fibers infiltrated with copper binary alloys that contain elements of varying solubility in tungsten. Room-temperature tensile tests were made on the composites, and a metallographic study of the microstructure of the fiber - metal-matrix interfaces was conducted. The tensile strengths and microstructures of these composites were compared with those of tungsten-fiber-reinforced - copper composites, which represent a mutually insoluble system. In addition, metallographic studies were made of tungsten fibers infiltrated with alloys, 70 percent nickel plus 30 percent iron, S-816, and L-605. Fibers also were chromium plated and infiltrated with copper.