Metal-metal reinforced laminar composites

Two prototype laminar composites have shown potential for high strength and high temperature applications. These composites might be made with less in-place anisotropy and be less expensive than comparable fiber composites

Cleaning and stabilization of dispersion strengthened materials

Stable dispersion hardened materials produced by controlled cleaning and pressing of ball milled blend of metal and metal oxide powder

Metal-metal laminar composites for high temperature applications

A study was conducted to obtain indications of the potentialities of laminar metal-metal composites for elevated temperature use. Most of the composites consisted of multiple layers or laminae of tungsten alternated with laminae of Nichrome V, a ductile, weaker but oxidation-resistant alloy. Composites with 50 volume percent of each phase were tested in tension and stress rupture at temperatures of 871 and 1093 C (1600 and 2000 F) and in impact at 23 and 524 C (73 and 975 F). A tension and a short time stress-rupture test was conducted on specimens of 77 v/o W-Re-Hf-C/23 v/o Inconel alloy 600 at 1093 C (2000 F)

Method of producing refractory composites containing tantalum carbide, hafnium carbide, and hafnium boride Patent

Production of high strength refractory compounds and microconstituents into refractory metal matri

Method for producing fiber reinforced metallic composites Patent

Description of method for producing metallic composites reinforced with ceramic and refractory hard metals that are fibered in plac

Grinding as an approach to the production of high-strength, dispersion-strengthened nickel-base alloys

Mechanical process produces dispersion-strengthened metal alloys. Power surface contamination during milling is removed by a cleaning method that involves heating thin shapes or partially-compacted milled powder blends in hydrogen to carefully controlled temperature schedules

Method for alleviating thermal stress damage in laminates

A method is provided for alleviating the stress damage in metallic matrix composites, such as laminated sheet or foil composites. Discontinuities are positively introduced into the interface between the layers so as to reduce the thermal stress produced by unequal expansion of the materials making up the composite. Although a number of discrete elements could be used to form one of the layers and thus carry out this purpose, the discontinuities are preferably produced by simply drilling holes in the metallic matrix layer or by forming grooves in a grid pattern in this layer

Overlay copy technique to provide high-contrast electron micrographs for automatic metallographic analysis

Overlay copy technique to provide high-contrast electron micrographs for automatically determining quantitative microstructure of multiphase specimen

Strength and High-Temperature Stability of Dispersion Strengthened Nickel-MgO Alloys

Strength and high-temperature stability of dispersion strengthened nickel-magnesium oxide alloy