Accession Number : AD0463840


Title :   RESEARCH INVESTIGATION OF PHASE-REINFORCED HIGH-TEMPERATURE ALLOYS PRODUCED DIRECTLY FROM A MELT


Descriptive Note : Quarterly progress rept. no. 3, 31 Dec 1964-31 Mar 1965,


Corporate Author : UNITED TECHNOLOGIES CORP HARTFORD CT


Personal Author(s) : Lemkey, F D ; Salkind, M J


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/463840.pdf


Report Date : 15 Apr 1965


Pagination or Media Count : 42


Abstract : The results of continued investigations on whicker-reinforced high temperature eutectic alloys are presented. Ingots of Ta-Ta2C have been unidirectionally solidified at 15 cm/hr to produce a composite of aligned tantalum carbide rods and platelets within a matrix of tantalum using a modified electron beam zone melting apparatus. A consistent crystallographic relationship between Ni and NiBe interpenetrating single crystal lamellae of a eutectic grain has been examined in detail using a hard sphere atomistic model of the interface. The results of a study of cyclically loaded Ni-NiBe eutectic alloy has indicated that most of the deformation takes place within the nickel solid solution matrix. The yield strength increased with each cycle and reached a constant maximum value after four cycles.


Descriptors :   *HEAT RESISTANT ALLOYS , *FREEZING , *ALLOYS , CARBIDES , CRYSTALS , ELECTRON BEAMS , MELTING , NICKEL , NICKEL ALLOYS , TANTALUM , CRYSTAL GROWTH , CRYSTALLOGRAPHY , BERYLLIUM ALLOYS , INTERMETALLIC COMPOUNDS , BORIDES , NICKEL COMPOUNDS , EUTECTICS , BORON ALLOYS , TANTALUM ALLOYS , TANTALUM COMPOUNDS , FIBER METALLURGY , COMPOSITE MATERIALS , ZONE MELTING , CONTROL , MECHANICAL PROPERTIES


Subject Categories : Metallurgy and Metallography


Distribution Statement : APPROVED FOR PUBLIC RELEASE