FACTORS AFFECTING MINIATURE IZOD IMPACT STRENGTH OF TUNGSTEN-FIBER METAL-MATRIX COMPOSITES

摘要

The miniature Izod and Charpy impact strengths of copper, copper-nickel, and nickel-base superalloy uniaxially reinforced with continuous tungsten fibers were studied. In most cases, impact strength was increased by increasing fiber or matrix toughness, decreasing fiber-matrix reaction, increasing test temperature, hot working, or heat treating. Notch sensi¬tivity was reduced by increasing fiber content or matrix toughness. An equation relating im¬pact strength to fiber and matrix properties and fiber content was developed. Program re¬sults imply that tungsten-alloy-fiber/superalloy matrix composites can be made with adequate impact resistance for turbine blade or vane applications.