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The purpose of this program was to develop processing techniques for melting and casting Mg-Li alloys which would be adaptable to ingots of commercial sizes and applicable for converting them into plate and sheet. A state-of-the-art report on melting, casting, and fabrication procedures for Mg-Li alloys was prepared.Melting and casting techniques were successfully developed for the production of 50-and 100-pound ingots of LA141 alloy using a vacu'im-induction melting unit under an argon atmosphere of 1-inch pressure. Subsequent evaluations of this material which included various mechanical-property determinations, ultrasonic inspection, corrosion tests, and metallographic examination, indicated it to be of low impurity content and to have good mechanical properties and formability. Those studies show that high-quality Mg-Li alloy castings can be consistently produced using techniques readily applicable to existing commercial vacuum melting equipment.Studies of fabrication procedures showed that with high quality material, processing conditions and fabrication temperatures could vary without deleterious effects on material properties or yield. However, the standard -T7 heat treatment now used as a stabilization treatment for commercial mill products can result in subsequent hardening due to room-temperature aging. Reduction of the stabilization temperature is recommended. -Studies of flux-melting techniques for the reclamation of scrap material have involved the casting of 6-, 20-, and 90-pound ingots of LA141 alloy through the use of newly developed flux compositions. Results were evaluated by visual appearance of each heat during melting and pouring and by extensive property evaluation of sheet rolled from cast ingots. The studies showed that good quality material could be obtained by fluxmelting techniques and indicate! considerable promise for reclaiming scrap material and ultimately reducing the cost of Mg-Li mill products.This document is subject to export controls and transmittal to foreign governments or foreign nationals may be made only with prior approval of the Manufacturing Technology Division of the Air Force Materials Laboratory.

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Inconel 718 Hydrostatic Extrusion ,. D 20 ABSTRACT (Continue oan trverse ide It necos*=-and Identify by block m.mitsee Because of a desire to :educe the cost of producing mortar tubes from a nickel alloy (Inconel 718), hydrostatic extrusion was examined at Batteile, Columbus Laboratories. Using subscale tubes, extrusion parameters were developed ana then applied to full size 60rnm tubes. It was shown that tubes can be satisfactorily produced at a reduced cost. Estimates were developed to mass produce hydrostatically extri-ded tubes. The processing parameters, dimensional results and economic analysis are presented in detail. DD J" 1473 EDITION OF I NOV GS IS OUSOLETE URNCLASSIFI FD i SECURITY CLASSIFICATION OF THIS PAGE