Accession Number : ADA190492

Title :   Growth and Deformation Mechanisms of Refractory Alloy Hybrid Materials.

Descriptive Note : Annual rept. 15 Sep 86-15 Sep 87,

Corporate Author : MCDONNELL DOUGLAS RESEARCH LABS ST LOUIS MO

Personal Author(s) : Sastry, S M ; Bowden, D M ; London, B D ; Lederich, R J ; O'Neal, J E

PDF Url : ADA190492

Report Date : Dec 1987

Pagination or Media Count : 38

Abstract : Oxide-dispersion-strengthened and whisker/particulate reinforced titanium and niobium alloys produced by rapid solidification processing are being investigated with the objectives of understanding the mechanisms of formation and growth of the secondary phases and how these factors determine strengthening mechanisms and thermal stability of Ti and Nb alloys. During the first year of the three-year program, Titanium alloys containing Aluminum, Erbium, Boron, and Carbon, and Nb alloys containing Tungsten, Hafnium, Lanthanum, B, and C were prepared by nonconsumbable electrode arc melting and microstructures were characterized. The alloys were rapidly solidified by electron beam melting and splat quenching and the rapidly solidified flakes were characterized by x-ray diffraction, optical metallography, and electron microscopy. The mechanical properties of rapidly solidified Ti alloys containing Er, B, and C were determined by tensile testing of specimens prepared from electron-beam-melted and splat-quenched flakes. Keywords: Hybrid materials, Refractory materials, Oxide dispersions, In-situ composites, Deformation mechanisms, Work hardening.

Descriptors :   *NIOBIUM ALLOYS, *REFRACTORY METAL ALLOYS, *THERMAL STABILITY, *TITANIUM ALLOYS, *THERMAL STABILITY, ALUMINUM, ARC MELTING, BORON, CARBON, COMPOSITE MATERIALS, DEFORMATION, ELECTRODES, ELECTRON BEAM MELTING, ELECTRON MICROSCOPY, ERBIUM, HAFNIUM, HARDENING, HYBRID SYSTEMS, LANTHANUM, MECHANICAL PROPERTIES, METALLOGRAPHY, MICROSTRUCTURE, OPTICAL ANALYSIS, OXIDES, PARTICULATES, QUENCHING, REINFORCING MATERIALS, SOLIDIFICATION, TENSILE TESTERS, TITANIUM, TUNGSTEN, X RAY DIFFRACTION, WHISKER COMPOSITES, STRENGTH WEIGHT RATIO, METAL MATRIX COMPOSITES, FIBER REINFORCEMENT

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE