Ductile-Ductile Beryllium Aluminum Metal Matrix Composites Manufactured by Extrusion.

摘要

Recent advances in engineered materials have resulted in the development of several types of structural composites that are light weight, high strength and stiff. The beryllium- aluminum in-situ ductile-ductile composite alloy that is the subject of this proposal has the desirable properties of low density, high strength and high stiffness, as well as good thermal stability, high ductility and toughness not found in other composite materials. The goal of the Phase I effort was to determine the feasibility of producing a Be-Al composite wherein the composite is formed in-Situ through solidification processing and worked by extrusion to form the final shape and impart mechanical properties. The major conclusions of the Phase I program were: (1) Production of Be-Al composites by casting and extrusion is a viable technology; (2) Cast Be-Al ingots can be extruded with either an aluminum or copper clad surface; (3) Excellent properties can be achieved in cast and extruded Be-Al rod; and (4) Be-Al composites can be cast and extruded into lengths of moderately complex shape, as demonstrated by the extrusion of the modified I-beam used in Phase I. jg p.2.