FIBER-REINFORCED METALLIC COMPOSITE MATERIALS.
Abstract
Combining high-strength refractory wires and a ductile matrix alloy to produce an improved high-temperature composite material could provide greater capability for existing alloys. This program evaluated processing parameters required to produce metal-wire, metal-matrix (titanium- or nickel-alloy) composites by powder metallurgy fabrication methods. Compatibility studies correlated with processing and mechanical tests were used to select the matrix and wire materials. The program demonstrated the principle that refractory wires (NF tungsten or TZM molybdenum) reinforced nickel and titanium alloys at elevated temperatures. Hastelloy X reinforced with 37 v/o continuous tungsten wires or 36 v/o TZM molybdenum wires exhibited yield strengths of 2000 F which were 7.1 and 5.9 times greater than the unreinforced Hastelloy X. Alloy 713C reinforced with 27 v/o continuous tungsten wires exhibited yield strengths of 1800 and 2000 F which were 1.3 and 2.5 times greater than the unreinforced Alloy 713C. Tensile tests of thermally exposed Hastelloy X composites and 100-hour stress-rupture tests demonstrated that the TZM molybdenum wire offered good strength retention through 1800 F, while the NF tungsten wire provided excellent strength retention through 1900 F. Direct stress fatigue and creep tests substantiated that incorporating tungsten wires in the Hastelloy X matrix increased its resistance to plastic deformation. Dynamic modulus of elasticity data indicated that the wires improved stiffness of composite to same strength at 1500 F as fiber-free Hastelloy X at room temperature. Impact resistance of Hastelloy X was improved more by molybdenum wires than tungsten wires. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1967
- Accession Number
- AD0825364
Entities
People
- R. H. Baskey